Foxbody Mustang Holley Terminator X Install

[@chriswarner2795]

Finally someone that did a good detailed install on a Foxbody with a Ford engine. Thank you very much! Happily subscribed!

[@Mustang-Geek]

Follow me on Instagram (@wesduenkel) for short Foxbody Mustang videos and updates.

[@Mustang-Geek]

Here's more detailed setup and first drive video: kzbin.info/www/bejne/pYmYh3R-jricgJI

[@happygilmore8768]

You gotta see his car photography and online articles on how he rebuilt that 302 into a 306....Hes the famous Wes Duenkel...

[@stanley514]

By far the best explanation of how to install this system great job sir.

[@Mustang-Geek]

Thanks! Just a Foxbody guy trying to help out fellow Foxbody nerds!

[@kingkobra8774]

I love how you told me about the hidden ass gray plug up above the computer.

[@Mustang-Geek]

Makes it easier, right?!?

[@danpolk]

This is the BEST DAMN OVERVIEW of how to install the Terminator X. Holley needs to pay you to put their logo on this video and link it from their website.

[@Mustang-Geek]

www.holley.com/blog/post/how_to_install_a_holley_terminator_x_efi_system_on_a_foxbody_mustang/

[@danpolk]

@@Mustang-Geek LOL appears that's exactly what they did, eh? Nice.

[@thehellfox3423]

For the guys out there where the fuel pump relay is in the passenger side fender, the connector with the red wire that triggers the fuel pump may or may not exist. There's a green plug with a green wire in the passer side kick panel with a yellow stripe that splices out to three. Those three wires trigger the fuel pump. You can connect the green wire from the Holley kit to one of the spliced green wires with the yellow stripe and it will work. Although the Termi X harness already has a relay I still wired in another 40 amp relay just for peace of mind.

[@Mustang-Geek]

Great info. Thanks for sharing!

[@HalfCutGarage]

is that the 8 pin green plug beside the ecu? dig it hook to anything in the term x harness?

[@scottadkins918]

I have a 1987 4 cylinder car, would this still correct for it?

[@Cowgoezmoo101]

Thank you for taking the time to make a clean, detailed and informative video on this install!

[@Mustang-Geek]

My pleasure! Please like, subscribe, share this video, and check out my other videos on this channel!

[@kevin_nagle]

@2:03 The plastic cover does not have to be removed. Simply pull the relay, ground terminal & plugs through first and the 60 pin connector will come through last.

[@Mustang-Geek]

Thanks for sharing the tip!

[@backtheblue6112]

@@Mustang-Geek I have a complete spare harness I started taking apart to remove the air bag harness and gauge connector. I’m guessing the a/c will not work now with this setup?

[@Mustang-Geek]

@@backtheblue6112 No, but you can get it working again with this harness: www.currentperformance.com/shop/holley-terminator-ac-module/

[@kevin_nagle]

@7:35 DO NOT ATTACH THE RED BATTERY POSITIVE LEAD ANYWHERE EXCEPT THE BATTERY! DIRECT TO THE BATTERY, NOT TO A STARTER SOLENOID, NOT TO A JUNCTION/DISTRIBUTION POST DIRECTLY TO THE BATTERY! Follow the Holley instructions, they are there for a reason. Attaching the main power leads anywhere but the battery is asking for problems. MOUNT THE MAIN POWER LEADS DIRECTLY TO THE BATTERY!

[@KhariRoyalty]

Def says that in the manual several times

[@SvtPerformer]

Great video, you should be sponsored by Holley! This video made my decision easy to purchase this kit thanks

[@Mustang-Geek]

Glad it was helpful!

[@turboman351w3]

I wish you covered the timing like how to turn off timing to set base timing and then enable the static timing to make shore the Holley is in sync with balancer and distributor

[@Mustang-Geek]

I did in this video: kzbin.info/www/bejne/pYmYh3R-jricgJI

[@Eddie510s]

Hopefully you make a video of A/C installation soon ! Thank you for all the information and tips !

[@Mustang-Geek]

Working on it!

[@Eddie510s]

@@Mustang-Geek I might’ve missed it on your video , the map sensor vacuum hose . Does that run off the intake vacuum ?

[@Mustang-Geek]

@@Eddie510s Yes, directly to manifold vacuum.

[@haroldlingar9631]

Mustang Geek, could use your help on install if near Wisconsin. Very helpful video.

[@Mustang-Geek]

Where specifically are you located?

[@haroldlingar9631]

@ are you near Burlington?

[@Mustang-Geek]

@ yeah, not really. I’ll be up in West Bend over the holidays but not gonna have much time. Send me a email at [e-mail] and maybe we can sort your problem out via email.

[@Foxy86_part2..kin92]

My 86. Ugh such a fun headache . Trick flow upper . Kit then mad conversion now car barely want to turn on

[@Mustang-Geek]

Use the wiring diagram here to get you in the right direction. The early cars are probably going to use different wire colors, though. www.holley.com/blog/post/how_to_install_a_holley_terminator_x_efi_system_on_a_foxbody_mustang/

[@scottwienandt1797]

In the instructions holley specifically says power and ground directly to battery for main power and ground.

[@Mustang-Geek]

They do. I didn't want to mangle my ring terminals every time I disconnect/reconnect my battery (which I do a lot), so I just connected them to the battery cables coming directly from the battery. But, you're welcome to do it differently.

[@scottwienandt1797]

@@Mustang-Geek it's just you may run into problems with noise frequency with the holley the battery acts as a filter.

[@Mustang-Geek]

@@scottwienandt1797 Roger that. Good point.

[@ripjanetstrimel3312]

Great video !! My 93 mustang gt is in my Mechanics shop right now getting this up grade and gears .. can’t wait to feel the difference with the x put in !

[@ripjanetstrimel3312]

@Chris Koepp Na not yet the holly has been on back Oder for over a month now

[@bryanleverett2830]

Great video !! Only small thing is.... holley says like 12 times in the instructions that the main power needs to goto the battery positive and battery negative DIRECTLY ON THE BATTERY. I hope you never find out how touchy these holley ECU’s are, but I’m shocked no one has mentioned it. For anyone using this as a guide, put the main power/grounds DIRECTLY on the battery. Again, really awesome you took the time to post this to help everyone :)

[@Mustang-Geek]

It's to avoid RF noise. Feel free to connect your power wire directly to the battery terminal. Mine works great with it connected directly to the battery cable at the starter solenoid, but if you want to connect yours directly to the battery, go for it!

[@bryanleverett2830]

FixBody Mustangs the battery dampens surges in the electrical system that holley says can damage the ecu. Holley also says “If you don’t hook them up directly to the battery, and you have a ecu fail, don’t even call us”. All the people that do this professionally go bananas ( search “Devon holley” on KZbin) when they see the main power hooked up anywhere but the battery. Now..... can you act like holley are just saying to be jerks and you know better than the company that built it, and it work? Sure. You just did. But if you ecu stops connecting in 2 months and the car won’t start, don’t be mad at holley when you mail them the ecu and they say, “It’s bad. It’s not covered under warranty because it was clearly hit with a power surge”. I’m not saying YOU shouldn’t do it how ever you want. I would say, prob not great to tell everyone watching this to disobey a corner stone of what holley says like 8 times in the instructions (I guess for no reason, lol).

[@Mustang-Geek]

@@bryanleverett2830 OK. This is a video how _I_ did it. If you want to do it differently, that's great.

[@jasonlulgjuraj3672]

On the Holley screen U can click on the number to type it in so you don’t have to scroll

[@Mustang-Geek]

Ha! Yes, I realized that after I became more familiar with the handheld. But, just like I said in the video: this was the FIRST time I was using it! I was really pleased how well the car ran right out of the box.

[@jasonlulgjuraj3672]

@@Mustang-Geek yea there soo good for the money!

[@HalfCutGarage]

im stumped with the 8 pin green plug(rectangle) beside the ecu. and the 8 pin by the alternator(round black) that goes down the front of the engine . the f kit was discontinued so a had to order the regular kit ..... appreciate any insight you can provide!

[@Mustang-Geek]

Depending upon the year, the green plug next to the ECU can be used to tap into the fuel pump wiring. The best solution is to find a wiring diagram for your year Mustang.

[@jakub584]

Can you explain more on how you connected your oil pressure and coolant temp to the stock gauges.

[@Mustang-Geek]

I just wired them directly to the gauges by bypassing the "salt and pepper shaker connectors." Once you remove the factory engine harness, it becomes kinda obvious.

[@BudzyFoxMX5]

Thank you very much for creating this video. It has helped tremendously, I'm almost finished! Two questions for you. Is there any specific reason you didnt ground the Holley at the same spot the factory ECU was grounded? Did you connect it closer to the battery to just be certain you had a good ground?

[@Mustang-Geek]

Good question. The Holley instructions are adamant that you connect the power and ground for the Terminator X directly to the battery. I didn't want to do that, but I did the next best thing.

[@BudzyFoxMX5]

@@Mustang-Geek thanks for the quick reply!

[@Mustang-Geek]

@@BudzyFoxMX5 You're welcome! Keep us updated on how well it runs! Check out my other videos on idle control to really get the drivability dialed in!

[@BudzyFoxMX5]

@Mustang-Geek I started it for the first time tonight but it won't idle, I have to slightly press the pedal. I'm waiting on the mail to deliver the laptop cable so I can reference your idle control videos. Thank you again for these videos!

[@Mustang-Geek]

@@BudzyFoxMX5 When you do, check this first: kzbin.info/www/bejne/oZitnX-EfpmrhpYsi=0_DIc4OESMOVDphb

[@5literfox89]

You can type the numbers in that cubic inches box instead of going one at a time. Just push the box.

[@Mustang-Geek]

Yeah, I realized that after I made the video. Shows how much of a noob I was when I installed the system. If I can do it, ANYONE can do it :)

[@anthony8194]

I have it wired similar to yours but I'm not getting spark at the coil. Coil + wire (red/green) to red/green at connector and negative - green wire to tan wire spliced into the white wire. Just cranks no start

[@Mustang-Geek]

This diagram should help (You also need red/white wire to positive side of the coil.) kzbin.info/door/eJaO0ySaJ07Igg-qgMWvPQcommunity?lb=UgyMR72JMcb7LD1LlsF4AaABCQ

[@anthony8194]

@@Mustang-Geek the red/white wire in the book says it needs to go to the fuse box

[@Mustang-Geek]

@@anthony8194 It needs switched power. The wire in the diagram is switched and fused. It's fine.

[@JI-pp1dg]

i am in the middle of installing my holley terminator x max, i’m stuck. I watching the video which helped my question is i have the green wire that is for the fuel pump wired to the fuel pump at the relay under my front seat, i’m unclear on where to pick up my 12v switched wire from. and it looks like since i’m basically using a factory style coil i also need to get a relay and power the + side of my coil, why did you connect the green wire for fuel pump in the kick plate?

[@Mustang-Geek]

I'm not sure if I totally understand your question. You can pick up a 12V switched wire anywhere, really. I connected the fuel pump wire in the kick panel because it was convenient and led to the OEM relay wiring under the seat. But, it seems like what you did will work just fine as well.

[@JI-pp1dg]

@@Mustang-Geek the holley manual says the 12v switched needs to have power when you are cranking, i’m able to locate a 12v source but as soon as i turn the key as too start it my light goes out on my test light

[@Mustang-Geek]

Does this wiring digram help? kzbin.info/door/eJaO0ySaJ07Igg-qgMWvPQcommunity?lb=UgyMR72JMcb7LD1LlsF4AaABCQ

[@codyriecken1474]

I don’t have the brownish plug I have a grey one and a black one and from the research I did only the 92-93 fox body have that

[@Mustang-Geek]

Just use a test light or google a wiring diagram for your year model. It's not that tough.

[@marcusfabiousmaximus3463]

Can you come install it in my boosted LX....great video

[@WesDuenkel]

If you watch the video, I practically do the work for you :)

[@PeakPerformanceEngineering]

Awesome video! So you were able to completely remove the original engine computer? It doesnt control the AC or any other functions like that? I just pulled my stock engine out and am getting ready add the Terminator and need to go through the stock harness and keep my airbags, lights, AC stuff, etc. I'm doing it on a SN95 with the 5.0

[@Mustang-Geek]

The Terminator X replaces the factory computer.

[@michaeltexmjs6420]

Hi, so you connected the 12v switched Red/Green from the C110 plug wire to the Red/White Holley wire? Thanks!

[@Mustang-Geek]

Check this diagram out: yt3.ggpht.com/-b_c90RDPNyhrLvlCY4h1G-j7sIGHr-jPAKPY6nTSPxnyORBb4NUkOFXfrA99WFyc_rA0wOV2TtNtw=s1600-nd-v1

[@michaeltexmjs6420]

@@Mustang-Geek excellent! It would be nice if Holley would include this diagram.

[@TheStrongingrace]

Awesome ...... Video ty for your help ... my guy !!! can hardle wait to get mine installed ... on a 1989 347 Stroker Supercharged and 175 shot NOS ...

[@Mustang-Geek]

No problem! Please check out my other videos, subscribe, and like this one!

[@TheStrongingrace]

im a new Sub ... abd ill be checking into your outher vid's@@Mustang-Geek

[@Mustang-Geek]

@@TheStrongingrace Great! Thanks!

[@joelemmer8524]

this is perfect, im looking to possibly install the terminator x on my 88, this was very helpful, thank you

[@jesseochoa4807]

Can you mention some of the old plugs that aren't used anymore and that will just be sitting there?

[@Mustang-Geek]

I'd honestly completely remove the OEM harness and to back and "add in" what you need.

[@jesseochoa4807]

@Mustang-Geek sorry dont mean to bother with a bunch of questions im currently installing and ive pretty much got everything however i have 1 question about the fuel pump relay bypass you mentioned connect red and green wires however i dont have a green wire at the relay. Holley manual says run the loose green wire to the relay but doesnt mention color

[@Mustang-Geek]

@@jesseochoa4807 some cars will certainly have different wires and colors. You just need to find out which one goes to the fuel pump. If I recall correctly, the Holley harness has a fuel pump relay built in. So, you don’t need to use the factory relay otherwise you will have two relays which is unnecessary and hard to diagnose if one of them fails. That’s why I bypassed the factory relay with a jumper wire on my car. When in doubt, find a wiring diagram for your specific year of Mustang and that should help you out to find out which wire goes to the fuel pump from the factory relay.

[@jesseochoa4807]

@Mustang-Geek i ended up finding the wire running to the pump, a pink with black wire and ran the green holley wire under the drivers seat. Thanks for the help

[@Mustang-Geek]

@@jesseochoa4807 GREAT!

[@rskybsns481]

I assume you only kept the airbag harness because..... you still have airbags? Not for some other trickery within this wiring job?

[@Mustang-Geek]

Correct. I want to keep my air bag functionality.

[@rskybsns481]

@@Mustang-Geek Sounds good. Thank you for the reply sir. Watch this video about 3 times every evening as my Terminator X is on the way shipping 😂

[@Mustang-Geek]

@@rskybsns481 Glad I could help!

[@victorsalomon3305]

Great video tnks for the info! Question tho, the fuel relay must stay in place in order for the fuel pump to work?

[@Mustang-Geek]

If I understand your question: no. The factory fuel pump relay can be removed. The Holley relay in the kick panel is the only relay that's being used.

[@SmokedTirez]

In your video I dont see where you had any issues getting the IAC working yet I see that others had to use a noid light and change the PWM parameters to getting theirs working...Did your stock 2 wire IAC work without any extra fiddling?? Seeings those carpets emit alot of static discharge in the winter Im interested in how mounting the ECU under the seat is gonna work out..

[@Mustang-Geek]

I had the problem, but my understanding is that it's rare. I didn't include it because I didn't want to confuse people who don't have the issue. It seems to be a weird bug that only a few people have experienced. Regardless, changing the IAC setting using the software is pretty simple. Here is how to do it: kzbin.info/www/bejne/oZitnX-EfpmrhpY

[@barryingram2009]

Great details! Have you integrated the ac system if so how? I'm looking into that option

[@Mustang-Geek]

I have not yet. At the very least, you need to run a relay between the A/C controls and the pressure switch.

[@TheNote408]

I'm getting ready to install mine this weekend I watched your video couple times and I read the instruction manual a couple times it says if you want to keep your OEM coil that you need to get a relay and it says how to wire it did you have to do that to keep your OEM coil... Looks like in your video you just ran a couple wires from the coil...I even bought a coil pigtail cause I want to keep my factory harness so I can sell it

[@Mustang-Geek]

I didn't use a relay between the coil + and the Terminator switched 12V + wire.

[@TheNote408]

@@Mustang-Geek ok thanks...great video by the way.

[@jaimecisneros8037]

Question I’m kinda stuck here. Would this be considered a dirty connection as per the Holley instructions? Running red/white 12v wire to positive coil. Thanks

[@vandettabuilds6641]

You have a new subscriber in SLC Utah. This is the best detailed video on doing this install!!!! I have a 1996 F1 50 with a 302 engine I just built can I run this system on my truck?

[@Mustang-Geek]

Welcome and good question! I recall your intake faces the other way on F150s, but I think there is enough slack in the harness to make it work. I suggest trial-fitting the harness first to see if it will work before going through the rest of the installation process.

[@vandettabuilds6641]

@@Mustang-Geek okay thank you!!!

[@joshuacastleberry1431]

I know this is old but I can’t find any information. Hopefully you will get this. How do you still run a factory radiator fan with the terminator x installed?

[@Mustang-Geek]

I used the stock mechanical fan.

[@ronneal5464]

Awesome video! Does the Holley only have three different injector sizes? Jw I have 60lbs

[@Mustang-Geek]

The menu has lots of options. 60 lb/hr should be no problem.

[@sethjeffreys3055]

Lookat that air filter sucking all that hot air !

[@Mustang-Geek]

With 200 HP on tap, ask us if we care :)

[@Drives88]

Great video, are you still happy with it?

[@Mustang-Geek]

Yes. Very much so. This helped a lot: kzbin.info/www/bejne/fGOkgaOon5mdm7c

[@Boostedjasper]

Thanks for sharing! great detailed walkthrough man, Subscribed! 👍

[@Mustang-Geek]

Welcome!

[@Mustang-Geek]

Here's more detailed setup and first drive video: kzbin.info/www/bejne/pYmYh3R-jricgJI

[@Scrapla1]

Can I just not re use my air bag harness? I have a 90GT and don't trust that airbag anyways.

[@Mustang-Geek]

When it comes to air bags, we're not going to advise you eliminate them!

[@Scrapla1]

@@Mustang-Geek I understand and thank you for responding!

[@35nomoon]

WOW that was 10x easier than my Holley I got 3 yrs ago for my mustang.

[@Mustang-Geek]

It was pretty easy! Please like and subscribe!

[@duane9707]

Excellent vid! One of the best I've seen re: the fox body. I assume the holley system does not control emissions/egr? Thanks.

[@Mustang-Geek]

Correct. It is for racing vehicles.

[@jonbinkley5389]

I would love to know if this would work on my 1994 F150 5.0L. I am praying it will!!! ANY INFO would be highly appreciated. GREAT VIDEO and now i am a new subscriber. God Bless

[@Mustang-Geek]

I think that will work. The trucks may have some components in different locations, but overall, it's very close to a Mustang. The harness with the Terminator X is pretty long, so it should reach everything.

[@kylerobinson6102]

@@Mustang-Geek I also think it will work... I don't see why it wouldn't to be honest.

[@BarrettAutoLife]

It's possible.

[@Scrapla1]

I heard you need to buy a separate wiring kit to keep your factory A/C. What did you do? Does your A/C still work?

[@Mustang-Geek]

I never fiddled with the A/C because the whole system needed to be replaced. But yes, there is an A/C relay that someone makes for Terminator X. Just google it.

[@chuck_machine]

Great video - thank you for posting it! Did I see this correctly - does the Holley Terminator system use the Mass Air sensor? If not, wouldn't that make it a speed density system?

[@Mustang-Geek]

Yes, the default setup of the Holley Terminator is "speed density." The MAF is not used. I left the MAF installed because it is an "adapter" from the intake tube to the air filter. I could get a different filter or find a different coupler, but whatever.

[@chuck_machine]

@@Mustang-Geek Got it. It just seems odd that they don't use the Mass Air. That was really the big advantage to these engines originally. Seems like it would only help the Terminator to know how much air is being pulled into the engine as a way of measuring load & demand. Thanks for the reply!

[@Mustang-Geek]

@@chuck_machine A MAF is great with narrow band oxygen sensors, as WOT open loop fueling is more accurate with a MAF. But the wide-band O2 sensor with the Holley Terminator makes a MAF less useful. Consider that the new 2020 Shelby GT500 is speed density!

[@chuck_machine]

@@Mustang-Geek Interesting. Did not know that about the role of O2 sensor and Mass Air or the new Shelbys- learn something every day!

[@DieselRamcharger]

@@chuck_machine maf is calibrated to a flow range. once you exceed that range, the maf is worthless. not ideal for a one size fits all efi system.

[@chriswhitehouse9764]

Nice info. I just may have to consider ditching my old PMS InterACQ system for this.

[@stevey5713]

Great vid! Regarding the blue vacuum line...What the heck is a quick-turn adapter and where do I get one?

[@Mustang-Geek]

Haha! I had the same question. It's included with the kit. It's clear plastic, and in one of the little bags.

[@stevey5713]

@@Mustang-Geek There's my problem...It must be missing from my kit. I was also missing the hardware to mount the EEC to the plate. Guess I will call Holley. Thanks for the quick reply!!

[@Mustang-Geek]

@@stevey5713 Mine didn't have any hardware to mount the ECU to the plate. Check ALL the bags. Mine was in with the O2 sensor clamp or something I think.

[@stevey5713]

@@Mustang-Geek You da man! That is exactly where it was, in the O2 bung bag. They need to make that adapter bright red, haha. Thanks again!

[@joshuacornelius1389]

I'm regards to the switched power source. Did you run the coil positive back to same wire the red and white is spliced to? Or did you use two different wires?

[@Mustang-Geek]

At 5:47, I explain this. Both coil + and 12v+ switched run off same wire.

[@joshuacornelius1389]

@@Mustang-Geek just wanted to make sure I heard right. It's kind of confusing cause the holley directions say not to run the red and white to coil... but then you read farther down it says to hook it to positive side of coil?!

[@Mustang-Geek]

@@joshuacornelius1389 Not sure exactly what the instructions say, but this worked for me.

[@jeffreymerland2327]

Can you explain how you connected the oil pressure connector on the new harness to the stock oil sending unit ?

[@Mustang-Geek]

I did not connect the factory oil pressure sender to the Holley harness. That would require a separate sensor that is compatible with the Holley EFI system. I just connected the oil pressure sender for the factory gauge.

[@aaronsmith3291]

I'm installing mine now. I think I noticed that the coil connects to the solenoid. If I saw that right, does it start connected to the solenoid and I just splice into the wires?

[@Mustang-Geek]

No, the coil is not connected to the solenoid. It has its own power source, noted in the wiring digram here: www.holley.com/blog/post/how_to_install_a_holley_terminator_x_efi_system_on_a_foxbody_mustang/

[@camgiggety12]

I just ordered mine for my 89 if I’m not using the factory dash how would I wire the Holley terminator to the factory ignition coil?

[@Mustang-Geek]

Does this help? images.holley.com/014-holley-terminator-x-foxbody-mustang-install.jpg

[@codyriecken1474]

Did you just zip tie up the fuel pressure plug,oil pressure plug and the green map plug on your Holley harness?

[@Mustang-Geek]

I zip tied all the unused plugs to the main harness to keep them out of the way.

[@codyriecken1474]

@@Mustang-Geek would those be the fuel pressure one and oil pressure one and the map plug?

[@Mustang-Geek]

@@codyriecken1474 If you're not using a fuel pressure sensor and the internal MAP sensor, then yes.

[@codyriecken1474]

@@Mustang-Geek are you using your oil pressure plug if so how did you wire it

[@Mustang-Geek]

@@codyriecken1474 No, I am not using the oil pressure plug.

[@michaeljones3972]

I just installed the holy terminator X in my 88 mustang what settings should I use for the ford performance 24lb injectors and I’m not sure what settings to use for the cam I have a b303 cam shaft

[@Mustang-Geek]

Select 24 lb/hr injectors from the wizard (I think factory ford injectors are an option). I'd pick the cam option that's one step up from stock.

[@MoTaRDvlog]

Stupid question, is the factory ecu used at all, or is it completely replaced by the terminator-x system?

[@Mustang-Geek]

Not a stupid question. It is completely replaced.

[@MoTaRDvlog]

@@Mustang-Geek highly appreciated my friend, keep up the good work!

[@foxjunkie3013]

U deserve more subs bro. U got mine👍🏽

[@Mustang-Geek]

Thanks!

[@vasiliskatsaras1014]

Is the IAC pigtail part of the terminator x harness ?

[@Mustang-Geek]

The Terminator X harness plugs into the factory IAC.

[@koupe88wehadababyitsaboy96]

This video made up my mind I'm getting it now

[@Mustang-Geek]

Great! Let us know how it goes!

[@mustangjoe2066]

My million dollar question after all this!!will the tfi module on the distributor still over heat and leave you strained??

[@Mustang-Geek]

Then use a different distributor. My DUI TFI distributor works great!

[@mustangjoe2066]

@@Mustang-Geek in will look into that,im using the screaming demon coil!excellent coil!

[@706Racing]

How long did it take you to install? Thinking about doing this to my 92 gt!!

[@Mustang-Geek]

It took me a weekend to install. If you can install a car stereo, this isn' much harder.

[@Pitviper1996]

Did you have to buy any additional sensors for this installation? Some people say you need a fuel pressure sensor, oil pressure sensor and other misc things

[@Mustang-Geek]

Nope. No additional sensors are necessary to get it running. Those other sensors are nice to have if you're diagnosing issues, but they aren't needed.

[@Pitviper1996]

Does all your factory gauges work?

[@Mustang-Geek]

@@Pitviper1996 Yes, all my factory gauges work.

[@joshbeard3825]

Could you please give a run down on how you got the gauges to work with the terminator x?

[@Mustang-Geek]

Hi Josh. Does the info starting at 5:21 help?

[@joshbeard3825]

It does, but I didn’t know if there were more details to it. This is my first swap, and unsure on what I’m doing. I’m wanting to use the terminator but want to keep ac and factory dash. Just trying to get all the info I can. Thanks.

[@Mustang-Geek]

@@joshbeard3825 Keep in mind that the gauges are completely independent of the fuel injection on foxbody Mustangs. The only issue is that there tied into the engine wiring harness. Getting the gauges to work is easy. Here's a diagram: www.dropbox.com/s/p8e4hsq9ohuqbhy/014-holley-terminator-x-foxbody-mustang-install.jpg?dl=0 It's not complicated to get the AC to work, but you'll have to pull the A/C wires out of the harness like I did with the air bag. Or, you could just run a coupe new wires for the AC compressor, etc. Note that there's a WOT A/C cutout switch that won't work any more, since the factory EFI is not involved any more. Get a Ford electrical and vacuum troubleshooting manual if you're unsure.

[@Mustang-Geek]

Here's more detailed setup and first drive video: kzbin.info/www/bejne/pYmYh3R-jricgJI

[@eyedoctor04]

Josh Beard did you get the AC to work with the termi? I want to keep AC also.

[@frankbeas5145]

Question does anything go to the manual transmission harness?

[@Mustang-Geek]

Good question. No, nothing goes to the manual trans harness. The terminator X is oblivious to the transmission.

[@Droptop_50]

I'm confused on the green wire for the fuel pump without bypassing it threw c216 what wire on the stock fuel pump relay do I tap it into it's on a 91 gt as well

[@Mustang-Geek]

The green wire from the relay goes directly to the fuel pump, so you'd be connecting the green wire from the Holley harness to the green wire coming out of the relay connector. Here's a diagram: www.dropbox.com/s/p8e4hsq9ohuqbhy/014-holley-terminator-x-foxbody-mustang-install.jpg?dl=0

[@jasonperez4258]

Do you have part numbers for the sensors you had to buy to make this work I’m installing the harness currently

[@Mustang-Geek]

I didn't have to buy any sensors to get it to work. The kit comes with the needed sensors, however, I did purchase a fuel pressure sensor from Holley for the fuel pressure function, but it's not necessary.

[@kennethhein3710]

I’m debating on getting the kit I have a 1986 thunderbird with the 5.0 in it right now it’s speed density but I have the mass airflow harness to change it to mass air but I was going to make it a strip car so I wanted to get away from the old computer and get a nice upgrade instead of just getting a a9l computer what would need I have to do to make it work it’s basically a fox

[@Mustang-Geek]

If you're going to make it a "strip car," I assume this won't be a stock engine. This is EXACTLY what the Terminator X is designed for. The Terminator X will be a lot less headaches in the long run than the factory computer. Especially considering that the factory computer's capacitors are on borrowed time, if they haven't failed already. I'd go with the Terminator X without hesitation.

[@richp6959]

When you connect to the coil how did you that? Did you take the factory connector and just solder to that pigtail? Any pics?

[@richp6959]

Also any advice for a 91 mustang abd the fuel pump wiring as this year doesn't have the relay under the seat it attached to the main harness in the engine compartment

[@Mustang-Geek]

@@richp6959 On the coil wiring: there was a factory splice on the coil wire, so I just used that. But, any way to splice a wire works fine (but don't use a Scotch lock. Those are garbage). You could use a butt connector with one wire going in and two wires going out.

[@Mustang-Geek]

@@richp6959 On the fuel pump wiring: Mine is a 91 and the fuel pump relay is under the seat. If it's not, you'll just have to decide how to bypass it. You won't be using any of the factory main harness anyway, so just find out where the fuel pump wire is and connect it to the Holley harness.

[@richp6959]

Thanks so much for the info and great video, it has been a ton of help on my install!

[@Mustang-Geek]

@@richp6959 Did you get your fuel pump wiring figured out?

[@750gsxrjay]

How did you connect the alternator for it to charge also did you connect the A/C compressor.

[@Mustang-Geek]

The Terminator X does not affect the alternator wiring. It's wired up just like normal. My A/C system isn't hooked up. I'd try googling it. Haven't gotten that far yet, but when I do, I'll post a video.

[@jasonvitagliano6267]

Hello there sir and great video BTW but I'm unsure about one part...how to retain and wire oem coil. Old harness is out and followed the wires coming from the coil. I see how the neg side goes to tfi and main harness and 110 conn so just run tfi wire to white wire on holley and cut the other and plug the 110 in? Pos goes to 110, 2 wires to tfi and 1 to a relay by kick panel. How do I wire it to get spark? And I assume keep the inline fuse with it with the grounds that are close by??

[@Mustang-Geek]

Does this wiring digram help? images.holley.com/014-holley-terminator-x-foxbody-mustang-install.jpg

[@jasonvitagliano6267]

@@Mustang-Geek ok so understanding idea here. I know coil operation is a simple concept just not very smart on wiring issues. So turning key sends signal through the 110 into the coil giving spark and neg keeps my tach gauge working. Just one more thing, one of the red pos wires goes from coil to a relay in kick panel by the old ecu. Do I retain that? Just dont wanna damage any components or fry something lol!

[@Mustang-Geek]

​@@jasonvitagliano6267 I think I removed that relay and connected it to the Holley red/white. Turn on the key and see if there is power to the red/green wire in the kick panel.

[@dsrhectiic4739]

what did you do for volleys fuel pressure sensor? just leave it unplugged?

[@Mustang-Geek]

I used Holley's fuel pressure sensor.

[@Wortheys_Garage]

Are you gonna wire headlights turn signals an break lights etc. Wanna do the swap but don't know how hard that would be.

[@Mustang-Geek]

You don't have to worry about it. None of the chassis electrical system is affected. If you use the diagram here, gauges and everything work as they did with the factory ECU. kzbin.infoUgyMR72JMcb7LD1LlsF4AaABCQ

[@Wortheys_Garage]

Oh ok awesome

[@Mustang-Geek]

@@Wortheys_Garage Git er done!

[@bobsmith-st9lq]

Sorry to bother you, prepping for my install. The Holley direction say not to use coil as switched 12v. Have you had any issues?

[@WesDuenkel]

I haven't had any issues. I connected it that way because that was how the factory PCM got its switched power.

[@bobsmith-st9lq]

I am guess since the 12v sw. scource is ahead of the coil it is ok.

[@bobsmith-st9lq]

@@WesDuenkel , well I might be over thinking it. The red with green stripe aka coil triggered a relay for the comp. Not sure about emf problems with the coil wire as it would just trigger some internal switch on the holley. Just to be safe I was going to use a relay and trigger it with the coil wire and pull the switched source from the battery.

[@WesDuenkel]

@@bobsmith-st9lq Over-thinking is good...it means you're considering the details! All I know is mine works fine with the 12V+ switched wire that is also shared with the coil.

[@jasonm3109]

@@bobsmith-st9lq In the instructions, they say to use a relay to go to the coil regardless. That's the point I'm at right now. I wired it up like it was but then for the trigger it looks like I have to go to the same wire and I don't want to do that since it's in bold and caps to not "DO NOT connect to a "DIRTY" source like an ignition coil!"

[@bigmiami3763]

I just installed a holley term x just like this except i put the switched red in the 18 fuze spot an the holley doesnt turn on. Some ideas what to do would be much appriated

[@Mustang-Geek]

Is there power coming from the 18 fuse spot when the key is on?

[@bigmiami3763]

@@Mustang-Geek I’ve tested it with a light is kinda of hard to tell with my tester. But I’m gonna run it straight to the battery and see if it turns on

[@Mustang-Geek]

@@bigmiami3763 Yeah, give it a shot.

[@bigmiami3763]

@@Mustang-Geek I wired it to the battery and it worked so now I gotta find a switch source

[@Mustang-Geek]

@@bigmiami3763 Excellent!

[@775automotive9]

Do you end up removing the wiring that goes to the ignition coil? Does Holley provide that side of the harness? I couldn’t tell by the video. I ordered mine and I’m just trying to prepare myself so when I get mine in, even though it’s on back order so who knows when I’ll get it.

[@Mustang-Geek]

See if the wiring diagram here helps: www.holley.com/blog/post/how_to_install_a_holley_terminator_x_efi_system_on_a_foxbody_mustang/

[@bobsmith-st9lq]

Did you move the o2 sensor to holleys recommended orientation. My sensors point up 1990 and Holley says down for condensation. Installing mine soon, been waiting on shipping.

[@Mustang-Geek]

No, I didn't relocate the bung from stock, but you raise a good point. Since that location is so close to the engine, the sensors get plenty hot there so condensation shouldn't be an issue.

[@jakub584]

Such as did you just splice the wire to the connector

[@Mustang-Geek]

I think it's how you describe. Basically, you're just bypassing the engine harness because it's removed.

[@BADAZZ93STANG]

Awesome video brotha!!! Very informative!!!

[@Mustang-Geek]

@@BADAZZ93STANG Thanks! Please like, subscribe, and share!

[@BADAZZ93STANG]

All ready subbed!!!

[@balookhunga5337]

right on! installing mine this week! any after videos?

[@Mustang-Geek]

Not yet. Maybe I should do one?

[@balookhunga5337]

@@Mustang-Geek please do! this whole corona virus stuff has had me sitting at home, so perfect time for me to install the terminator x, do a new fuel system, and relocate my battery.

[@Mustang-Geek]

@@balookhunga5337 As soon as I'm done rebuilding my T5 (should be done this week), I'll do a follow-up video.

[@russellbroadwell]

Are you going to do a video on the T5?

[@Mustang-Geek]

@@russellbroadwell No, because Eric the Car Guy has a perfect video already. Here is Part 1: kzbin.info/www/bejne/joOopIV9br5ko7c

[@Cisco_927]

This is a great video it really explains everything and this will help me out with my engine swap thank you again.

[@Mustang-Geek]

Glad it helped!

[@Cisco_927]

Thanks again

[@PrestigeDentRemoval]

Great vid imfo,...Sold stock harness before i can get wires out. What other options do i have. Im running on3 turbo

[@Mustang-Geek]

No need to have the OEM harness. Just hook it up like the diagram I posted in the next comment below.

[@PrestigeDentRemoval]

@@Mustang-Geek Thank you

[@christianohh2971]

Hey question on the Oz sensor do you read one or two

[@Mustang-Geek]

It comes with one.

[@gregbrzostko7930]

Will this work with 42lb injectors? I have the Bosch green top 42lb I didnt see it on the list when you were setting up the system. Thanks

[@Mustang-Geek]

I don't know to be honest. You can also use the free laptop software to put the specs in for your injectors. I'd google that.

[@gregbrzostko7930]

Ok cool good idea I'll try that

[@funfunfun7441]

Thanks! Just ordered mine today!

[@kylerobinson6102]

How did it work out, did you get it installed in the car?

[@dean93stang]

Subscribed..... All the gauges work?

[@dean93stang]

And all the gauges wiring run thru that red connector near the master cyl?

[@Mustang-Geek]

@@dean93stang Yes, all the gauges work because they are independent of the ECU. I'm not sure if *all* the gauges go through that connector. The oil pressure, tach, and coolant do. The fuel gauge and voltage probably come through something else.

[@dean93stang]

Thanks awesome video Holley should pay you for it.

[@MrMikestang63]

curious.. i didnt see options for 60 # injectors . MSD, or larger MAF?

[@Mustang-Geek]

Not sure what the max injector size is, but you can select a bunch of different injectors. Holley 48 lb/hr are listed. If by "MSD" you mean ignition, the Terminator X works with any external box like an MSD. I don't have one...just the stock TFI. There is no MAF with the Terminator X. The Terminator X is speed density with wideband O2 feedback.

[@spoolinsvt6489]

Very detailed, love it. Been watching a ton of your videos the last few days. What did you do for the gauges? I was under the impression that factory gauges would not work with a Termi x set up? Or maybe that was just in my 97 cobra?

[@Mustang-Geek]

On a fox, the gauges are all independently run. Maybe the SN95 mod motor Cobras are different...

[@spoolinsvt6489]

@@Mustang-Geek Yeah i was thinking that after I wrote it. The later ford were electronic which makes everything more of a headache. Love your fox by the way. Looks like a very fun build

[@Mustang-Geek]

@@spoolinsvt6489 Thanks! Post this channel on your social media feeds :)

[@edgararevalo7081]

Great vid I jus did the install on my fox I'm still trying to figure out how to hook it up to my laptop

[@mustangsquad3029]

You will need a can bus to usb adapter like this one www.holley.com/products/fuel_systems/fuel_injection/sniper_efi/sniper_efi_service_components/parts/558-443 and if you want to run this and the small screen you will need a Y cable like this www.efisystempro.com/can-bus-y-cable-sniper-terminator-x

[@Mustang-Geek]

Here's more detailed setup and first drive video: kzbin.info/www/bejne/pYmYh3R-jricgJI

[@GearheadRob319]

so im green to all of this. what exactly is the benefit to replacing the factory computer and harness with a holley ter x system? besides replacing old brittle harness.

[@Mustang-Geek]

The Holley Terminator X can more easily accommodate engine modifications including camshafts, different injectors, superchargers, turbos, and nitrous. The old EEC-IV needed a "chip" which aren't really available from many tuners these days.

[@GearheadRob319]

@@Mustang-Geek ok, makes more sense. Thank you for the detailed explanation on your vids. Very professional btw. New sub here, looking forward to seeing more future updates. Thanks again.

[@Mustang-Geek]

@@GearheadRob319 Thanks! You might appreciate the other videos on my channel, especially the 3G alternator upgrade. Maybe we should put nitrous on this Fox and control it with the Terminator X...

[@GearheadRob319]

@@Mustang-Geek i watched that one. Definitely gonna check out all your vids.

[@billyblastbv]

Great Vid Wes. I was wondering and maybe I missed something but did you fully remove your stock ECU, and if so are all of your stock gauges working based on the couple wiring tricks you showed with the Oil sensor etc... How did you wire up your airbags to work? Did you use the AUX inputs/outputs in the TermX? Thanks in advance, Subbed!

[@Mustang-Geek]

I fully removed the factory ECU. The gauges work completely independently, so that's not a problem. (The ECU has its own temp sensor, that is replaced with one for the Holley Terminator X.) The air bag wiring is separate as well, I but since it was loomed with the MAF harness, I had to pull them apart. I am not currently using any inputs/outputs...yet. Should I add nitrous?

[@dustybyram8849]

What did you do with ground on back of motor

[@Mustang-Geek]

There is a ground strap that goes between the fire wall and the back of the cylinder head. That stays. If there is a ground for the injector harness (I don't remember), then it can go to the back of the head as well. The main ground goes to the negative side of the battery.

[@5.0world3]

How did you keep your AC with the terminator x kit?

[@Mustang-Geek]

www.currentperformance.com/shop/holley-terminator-ac-module/

[@kevin_nagle]

@7:05 THIS IS NOT A SELF TUNING/SELF LEARNING SYSTEM - THERE IS NO SELF TUNING SYSTEM AVAILABLE! All the ECU does is follow your commanded/targeted AFR (air fuel ratio). There is no computer out there that can "self tune" an engine, that's it.. there's no such thing available. You still have to tell the ECU what you want it to do at idle, at part throttle & at wide open throttle.

[@Mustang-Geek]

Ok. Semantics.

[@themrfabio2459]

What did you do about the EGR?

[@Mustang-Geek]

There is no EGR function with the Terminator X. Just left it unplugged.

[@rob5oh]

Great video! How does it run and start after you have had it on for a few weeks?

[@Mustang-Geek]

Very well! I had to make a few adjustments, and I'll show those in a follow-up video.

[@Mustang-Geek]

Follow me on Instagram (@wesduenkel) for short Foxbody Mustang videos and updates.

[@Mustang-Geek]

Here's more detailed setup and first drive video: kzbin.info/www/bejne/pYmYh3R-jricgJI

[@impulsereefing4035]

hey great video. did you do anything for the A/C wiring?

[@Mustang-Geek]

No, because the A/C is removed from my car. However, you could us a wiring diagram to figure out how to get it working again. Just keep in mind that the A/C will stay on during WOT (the factory cuts off the A/C during WOT).

[@impulsereefing4035]

FixBody Mustangs thanks. I’m pretty sure I figured it out. I was just seeing if maybe you had tackled it and had some info. Now I just have to find the 12v from the climate control switch.

[@Mustang-Geek]

@@impulsereefing4035 I"m pretty sure that you'll find that wire in one of the connectors in the passenger's side kick panel too.

[@jasonm3109]

You use the harness from the ac, add the kick input, and there is an output for the WOT relay. You can make it work like factory.

[@eyedoctor04]

Jason M do you have any additional information for making the AC work? What wires did you use and how you did it? Thanks

[@ballsjohnson029]

So when you installed the o2 wideband sensor for the holley, does that take the place of the left side OE o2 sensor?

[@Mustang-Geek]

Correct. All of the OEM O2 sensors and wiring harness (including the oxygen sensor legs of the harness) can be completely removed. Then, you can choose to put the Holley wideband in either the left or the right header where OEM sensors originally went in. You'll obviously have to plug the O2 sensor hole on the side you don't use. You can either use an old sensor or a plug. I put my O2 sensor in the left side header as (I recall) cylinder 5 is often the leanest with the OEM intake manifold.

[@ballsjohnson029]

@@Mustang-Geek nice thanks for the quick reply. I have a 1.5l kenne bell supercharger on, would I still go with the left side? I'm sure there's no difference in performance since it's pushing more exhaust out than stock

[@Mustang-Geek]

@@ballsjohnson029 Yeah, I honestly don't know. I'm sure it'll be fine in either side.

[@Mustang-Geek]

@@ballsjohnson029 By the way, make sure you are using an external MAP sensor (maybe 2 or 3 bar) with the Terminator X for your blower. You'll need to make those changes when you set it up. (I think you can do that with the handheld if you don't want to do it with the software.)

[@ballsjohnson029]

@@Mustang-Geek im not going to push anything more than about 2lbs of boost due to the size of the pulley. I have a couple questions on how you wired the fuel pump. so i did it as the guide says that came with the holley and spliced the green loose wire into the pink on the relay but the pump isnt whining as it should with the key on. do i need to connect the loose green wire off the holley to the red wire in connector 216? then splice the red into the green wire to bypass at the fuel pump relay under the drivers seat? i have 91 car

[@isaacramos31]

My dream interior I have grey at the moment

[@Mustang-Geek]

It's kinda weird that this car came with a black interior.

[@stang140mph3]

How different is this instal from a Holley hp efi I have that I need to install

[@Mustang-Geek]

Not sure. If your HP has a specific harness for the Mustang, it is probably similar.

[@brensheehey4941]

So im doing HCI on my fox, i have an 88, id still need an maf sensor ?

[@Mustang-Geek]

The Terminator X doesn't use a MAF sensor.

[@brensheehey4941]

@@Mustang-Geek so this would be my route after a cam and heads

[@Mustang-Geek]

@@brensheehey4941 Sure. Or before AND after.