Fixing My BROKEN TWIN TURBO Mitsubishi 3000GT | MAF Sensor Replacement

[@GhostDigital2k]

I love the Mitsubishi community. They are always looking out for each other. I'm not sure what's wrong with the VR4 but I would check out the coil packs. Make sure everything is fine.

[@MiguelDsm]

That’s on the list 👌🏼

[@bawlout9367]

ughhhhh ive always wanted one of these, car looks great man hope you get her running reliably

[@antyoo]

There is a counter weight on the shift tower. That counterweight on the six speeds sometimes can hit the Fmic piping making it harder to get into 5/6/reverse

[@SANTANA1deep]

Mine does this 😂

[@cesarestevez3312]

Having difficulty getting into reverse is a common issue on some manual cars , to combat that all you have to do is run it through your other gears ,then put it in reverse , same goes for 1st gear

[@bobcat3842]

I’ve found go 2nd gear and then reverse, never grinds but I don’t jam it into gear ever either

[@MiguelDsm]

The shifting on this car just feels notchy over all. Evo and dsm shift like butter compared to this one

[@billwise3002]

@@MiguelDsm I've noticed 2nd and 3rd are the worse as far as notchyness goes. I have to shift in a very particular way for them to go in smooth. Other gears always like butter though. Love the car!

[@frankm7707]

Put it in neutral, then step on and release the clutch twice (double clutch) before shifting into reverse.

[@micho_3715]

Yea happens to me when the tranny is cold.

[@Melvin-belvin]

What’s the story with that newer nsx parked next to your 3000gt?

[@mfaheypride]

Hey man, have you had your ECU opened up and looked at? Might be the old capacitors leaking that is giving you issues. That’s my next step, I’ve got a ‘92 VR4 and just recently replaced my PTU and Coil Pack. My car runs pretty well except very low in the RPM range where it can buck a bit.

[@MiguelDsm]

It’s on the list if the ptu and coil pack doesn’t fix it

[@mfaheypride]

Coil pack and PTU helped mine quite a bit, hopefully that’s it 🤞

[@garys1266]

My ECU was corroded on my 93 and I replaced it, that was my first thought.

[@eddylorenzo5033]

True went through it 20 plus years old

[@v1-vr-rotatev2-vy_vx31]

Mass air flow sensor does have an adjustable screw underneath it to help you tune, can change leaness and richness

[@lui._.saucyy]

Idk if this might be your issue im used to working on dsms! i recommended on one video the fuel pump and you got that done 💯 honestly I think that you have a bad coil pack i remember having these same noises n lil hiccups from my 2g and i checked the coil pack and it looked chewed maybe by a animal who knows… all ik is that i put in a new coil pack and the car was good and since then hasn’t had any issues

[@ZKrow382]

Does your tachometer needle ever get jumpy and if so do you know what the reason was for it?

[@josesupra]

Have you narrowed it own to a specific cylinder or bank? I would first pull spark plug wires one by one and find out if it’s all one specific cylinder. If it is one specific cylinder missing it’s easier the coil pack, wire, plug , injector or worse case an internal issue. Or possibly wiring issue in the harness to that coil pack. Sounds like at one point it started to clear up so that tells me it’s most Likely NOT internal. If it’s one bank it’s typically not a fuel pump, mass air flow or any other sensor that controls the entire engine. Because if it were one of those it would misfire on both banks, not just one bank or one cylinder. I wouldn’t rule out a possible ecu use, but the fact that it started to clear up makes me thing that’s also not it. Hope you get it figured out though. Love the cars.

[@MiguelDsm]

I’ll look into that, thanks for the insight!

[@joeseda8102]

That engine is missing. I suggest you check cam lobes for excessive wear. I have owned 2 VR4's previously, and both had excessive cam lobe wear. Both started with the same engine missing/misfire sound.

[@fredcancer8979]

I own a 1991 mitsubishi GTO Twinturbo bought it last years was dying in a field throw a new engine in it did oil pump timming belt etc and runs like new i love this car

[@carlosalarcon9377]

Like always i enjoy watching your videos soon i am getting my first eclipse gst your videos are motivational keep it up bro

[@MiguelDsm]

Good luck on your search for one man. Be patient and take your time. Thanks for supporting 🤟🏼

[@Danielveloz99]

man, watching your video makes me miss my old 99' eclipse.

[@_mason_jr6208]

Miguel videos be improving in quality so much

[@MiguelDsm]

1% better every day! Thank you!

[@pFbSpecV]

Man such a bummer your still having issues!! Hopefully it's solved soon!

[@albertocisneros3934]

Man the 3000gt sounds meannnn👌🏻👌🏻

[@luislanda2228]

Sounded so much better right away

[@trab8989]

Car looks great. I had a 93 VR4 for 10 years. loved the looks of the car but it always had a issue. Broken tcase, spun bearings and not to mention hard to work on. Im sure they have new parts out that weren't available when i had mine, i had just under 600awhp with 16g DR racing turbos and heads.

[@joels6736]

Check base timing, I believe it's supposed to be 5-7 BTDC with the timing pin grounded. Look up the proper procedure. This is very important on these cars and DSM's. Also may be a stupid suggestion but make sure the fuel filter isn't ancient and clogged up. Maybe pull the injectors and give them a deep cleaning. Just some suggestions, good luck!

[@A_T88]

Yo Miguel! I am just going to echo what I’ve seen in the comments on maybe what the issue might be… check your connections with your spark plugs and wires, but also a misfire can come from fueling. So check your injectors. And I’m not sure if you’ve thought about it, but maybe some bad gas? Good luck bro!!

[@MiguelDsm]

Hmmm it could be anything at this point. I’ve cleaned out injectors as well

[@UneekGraphics]

@@MiguelDsm Have you changed the spark plugs? If it's running rich or has been at any point they could be bad. My old DSM ran just like this when it ran rich. I had to replace plugs monthly.

[@fullweezy3553]

I really hope that you get this car working right because I have been loving the content on this vehicle

[@MiguelDsm]

Rather be out driving it at events vs working on it at home lol

[@fullweezy3553]

@@MiguelDsm I agree with you on that one

[@AO-3914]

Hey Miguel you should try to make an offer on the rx7 before someone else does. Love the videos by the way !

[@MiguelDsm]

Think about it every day man! Haha

[@wob6776]

Love the black on the spoiler, gives it a different and very cool look.

[@Rockyrjas]

Your VR4 could be "off timing" by a tooth or two. When you time them cars you need to put it off a tooth bc when you put the belt on it always skips or jumps a tooth. Same thing happened to my 3kGt. It ran like crap and was sputtering. Did not have any power. Check it out and let me know 👍🏼😊

[@buckwilliams5585]

I'll echo what some have said about the ECU, I seem to remember hearing that the capacitors on the circuit board of 3000gt's can be problematic. Also the PTU but the coil as well. ESPECIALLY if it gets worse the more heat soaked the parts get. A faulty coil can seem good when cool but fail as it gets warmer in my experience.

[@MiguelDsm]

I’ll be testing ptu, the coil pack then ecu

[@adrian4g635]

check gap on spark plugs

[@ELIDOTORG]

You need a tune in the 3000gt. cause it's straight piped now. So it is reaching different load cells compared to when it has a cat. Get a tune for the the high octane map.

[@GR44N]

Whoa just found this channel, nice 3000 bro subscribed!

[@mehrshadvr4]

Maybe the missing is the ecu or mechanical like collapsing lifters, popped out rocker arms burned valves etc. for the reverse make sure nothing is on the way of linkage. Make sure it’s always in reverse because later you might have popping out of reverse issues which is hard to fix because of lack of part availability.

[@princess_lalina]

4:39 🥴 feltttt your pain

[@TheSleezyPanda]

The Mitsubishi mafs can be very picky sometimes. Honestly you're not supposed to spray anything on the sensors because they're so sensitive. It's like a 50/50 chance of it working or failing if you spray it. On my Galant I was chasing MAF issues for the longest time. I swapped out multiple MAFs, wiped the sensor with q-tips, etc. Turned out the wiring in the connector was loose and losing connection. It would run fine after servicing it and plugging it back in. When doing a mild pull the harness would tug and the connection would get loose again. I ended up cutting a portion off and splicing in a new maf pigtail. I haven't had any MAF issues since like February of this year. You can try and look into your wiring if you can. Our older Mitsus are catching up in age

[@MiguelDsm]

Hmmm that’s some good insight. I’ll look into the wiring. Thank you!

[@andrewmcintosh9832]

@@MiguelDsm Yea you could have got another bad MAF. When you unplug it with the car running is there any difference? Also an easy way to check for a misfire is to pull the spark plug wires one by one and see if there is a change in idle.

[@ryantzer]

@@MiguelDsm Most MAF cleaners state right on the can that they are not to be used on Mitsubishi MAFs.

[@carlosmonge8765]

What’s your wideband doing when it runs rough? Is it going lean? May need to datalog to see what’s really going on, you could see if your O2 sensors are cycling and fuel trims updating.

[@darkmatterm4a1]

Hey Miguel. I see you have an upgraded FPR. What is your fuel pressure at when the car is at idle? Also, is the car on a stock ECU? It might be useful to try another computer. Leaking capacitors on the board is very common on 1st gen 3000GTs, but it can also happen on the 2nd gen cars too. Do you smell a rotten fish-type smell in the driver's footwell (right next to the throttle pedal)?

[@MiguelDsm]

Around 40 psi at idle. I would have to check on the smell, but the Ecu is on the list of possibilities. Leaning towards ptu first and then checking out the Ecu

[@darkmatterm4a1]

@@MiguelDsm Okay. PTU is a good place to start, but I don't think it's the root cause of your issue because you had some improvements after that O2 sensor install. This leads me to believe that your car is running really rich and the ECU is having issues adjusting fuel trims/timing. Luckily, yours is a 98 so you'll easily be able to use a ChromeECU on it. Finding a turbo 98 or 99 ECU is going to be very difficult, if not impossible.

[@MiguelDsm]

So a flash might be best

[@darkmatterm4a1]

@@MiguelDsm A flash would be a free and easy way to do some diagnostic work. It should provide a temporarily fix your problem, but I think the misfire will come back after the ECU makes it's internal adjustments after the flash. I hope I'm wrong. Let me know if you need the stock 99 VR-4 flash file. I have it saved on my tuning laptop as I'm running a ChromeECU on my VR-4.

[@MiguelDsm]

I have a fellow 3s guy down here with Evo scan. Going to see if I can get flashed with him

[@grayandluis]

Have you replace the ECU? Engine started running weird until the engine shut off randomly. I replaced coils, wires spark plugs, check the fuel pressure, wire checks and after so much work I decided to replace the factory ECU to a chrome reprogramable ECU from 3sx in NC, never had an issue since then

[@claudedottin1312]

I’m on this same journey with mine lol. My EVO is down and my Civic. My stealth is running better after changing PTU cleaning maf , changing spark plugs and coils …. But when it’s cold it’s misfiring it warms up it drives but full throttle it hiccups

[@MiguelDsm]

Seems like we’re living same lives 😂

[@claudedottin1312]

@@MiguelDsm yeah I’m leaning toward getting new ecu soon though. 😅

[@joetheshreker7634]

that intermittent sputtering or miss really sounds like a weak spark plug wire, spark plug or ground. i'd recommend looking into that. i had a similar issue and turned out it was a failing plug wire.

[@shamgarcia2000]

3kgt always make me excited 🔥💪

[@shamgarcia2000]

You can contact noah nelson father josh in case you hava a hard time 👌

[@renaissanceman5847]

You need to physically inspect from one end to the other each connector on the wiring harness for the engine control/monitoring systems to the ECU. or simply replace the entire wiring harness and the connectors with new ones (not with new old stock)... you probably have one or more bad/intermittent connections and the green creeping death that is ruining communication between sensors and the ECU, these problems cannot be seen unless you physically strip them down. while there you also need to inspect the ECU circuit board for bad soldering connections. Ive seen a few engine compartment control boards that had issues like this and were difficult to fix because the circuit boards are conformally coated.

[@Antonp21654]

If you think that the ptu or the coil packs might be dying on your car, there is a kit out there that removes the ptu and the coil packs. In return it gives you coil on plugs along with coil packs that are new age tech when compared to what was on the car from OEM spec.

[@Antonp21654]

@@willvr4 So It has a dizzy wheel?

[@rmoore4yris]

I had a 92 VR4 many years ago. Love this car cause it's not seen often but, damn car was problematic and interior leather/plastics was brittle. Nonetheless, glad others still find the car interesting. Keep them videos coming 👍

[@christianbavnild]

Plugwires ? My Mazda did the same thing. After i change plugwires and sparkplugs it run Way better. 😊 Have you checked all fuel injectors, connectors, Inspected Them ect ?

[@v1-vr-rotatev2-vy_vx31]

Installed an evolution 8 steering wheel on my 3000GT VR4, much easier to drive now than that big monster steering wheel from the factory. Connected the airbag on the EVO 8 wheel too.

[@ryanorr5755]

sweet ride. I had a 90 eagle talon back in the day. love dsm. if all else fails, a 4g63T may be in your future! ;)

[@christiannieto9552]

Was the issue resolved? Was was the fix for the hiccups/stuttering?

[@Tr1pMind]

did you try the fuel regulator yet? my eclipse has a bad one, can't put the pedal down much at all.

[@colby3333]

Do you feel like you've sacrificed reliability by adding performance parts? Or would you still have problems regardless?

[@MiguelDsm]

I do think it hinders reliability as you add power mods. That goes for any car though

[@ZKrow382]

My dsm has had that same no start up condition at 5:20, everytime it wouldn’t start, I’d push to start it, but idk what’s causing it to not start

[@MrLangobard]

Car stuttering through rpm range while driving and is fine while idling? Sounds like coil pack/coil boot/leaking spark. Good luck with this, its a nice car!

[@Principlesofpleasure]

Could be the heads are cracked or the head gasket is no good I had that problem after I replaced those issues it ran like a dream, sounded and ran exactly like yours before I fixed it

[@TheSwampDonkey]

I assume you have checked plugs, injectors? I never had a 3000gt but I did have a 95 Eclipse GST and once it would cut out, die, etc. Turned out to be a bad tank of gas that was causing the issue. Had to empty the tank, boil it out. Problem never happened again. Not saying that is your issue but might be worth looking into.

[@madcatg]

Just dealt with a similar issue it turned out to be the ecu!

[@sf2372]

I had to re watch the B roll on Monrovia Alignment, some ballin cars and cool sht all over the place.

[@jeffrymilton1093]

It is getting super hard to find any refuse blocks for the Stealth especially.

[@TT5kenny]

I had the same issue and it ended up being a bad injector.. unplug them with car running and see if they change

[@eddiez101]

Bro i want one so bad !! But man these prices ! Should of got one a few years ago 😭 love are your builds bro

[@MiguelDsm]

Prices are insane right now man. We might have a sale due to the economic downturn soon. Thanks though man!

[@sf2372]

Arent O2 sensors consumables?> I would swap out all four if you havent already

[@elbassaraghii5744]

Its crazy cause no one fixes them and there probaly if not one of the best period

[@willvr4]

I've owned 2 VR-4's and 1 base model which was my first car when I was 16. I'll always have love for these cars. Not gonna lie, got me a lot of pu$$y senior year and into college because they thought I had money and not that I was driving a 6k dollar Mitsubishi haha

[@acef_performance8416]

Maybe it’s cuz your MAF is upside down does it have a flap inside or is it open threw

[@SpaceRanger187]

need a tune and just get rid of the maf all together..and the engine harnesses on those love to crack and brake..I had one and its like an old harley always wants to give problems..but on the days it doesnt it loves to go fast.. if u haven't replaced the injectors i would have them flo tested and the plugs..omg all the nightmares of mine are coming back..good luck

[@res3571]

Diría que pruebes cambiando esos cables ( tipo MSD verdad?) siempre dan problemas, dos veces me han fallado (unos eran de 3sx se supone vienen bien armados) y el misfire muy parecido, no siempre aparece pero al forzarlo empieza la falladera, además ese maf si no estaba mal probablemente lo dañaste, no se limpian los karman vortex (siempre viene esa advertencia) peeero lo he hecho sin problemas siempre y cuando se deje secando un buen rato (un día para otro).

[@valentinhristov264]

Figure out witch cylinder misfires before u start replacing parts.these cars run pretty well if one cylinder is down, you can’t even tell it’s misfiring.

[@jinjitsu4350]

Wow they have a kenmeri in their garage 👌

[@turbo_brian]

Pay attention to how it drives when it's dead cold between 2k and 3k rpm. I bet it's worse there than anywhere else.

[@Donkern621]

VR4LIFE 😎 VR4EVER 😍

[@junjungtz2011]

Looks more like a grounding issue. Check all your grounds.

[@maxlegend8230]

I have the same car, guess what caused it, it was the PTU, better get the ECU capacitors replaced as well.

[@bavarialife1021]

whats with the steering wheel? on 2:30 looks kinda not aligned / not straight

[@Shaws_Garage]

Reverse is a little tricky on these Getrag 6 speeds. Sorry the car still doesn't run correct. But it will be that much sweeter when it finally does! If PTU/Coil does not fix it, the ECU may be the next culprit. This is why most people give up on these cars, they do not have the perseverance like you!

[@MiguelDsm]

Thats basically the way I’m going to tackle to issue. I agree on the the perseverance though. I’m used to it coming from DSMs haha

[@Shaws_Garage]

@@MiguelDsm Pretty sure there’s a chapter titled Perseverance in the DSM and 3S Service Manuals 🤣

[@MiguelDsm]

LOL

[@highwaltage]

maf sensor backwards? wont it be reading different from actual flow because of turbulence? also hows ya coils and leads? getting ur injectors ultrasonic cleaned is another bit of peace of mind.

[@QuickJames]

Might be unrelated but why not use a maf translator to use a gm maf that's what people used to do in the days .

[@melbournewilliams5193]

Did you check the fuel injectors?

[@MiguelDsm]

Yes, already had them cleaned

[@jaydouglas1428]

PTU Sensor!

[@jaydouglas1428]

My 1996 3000GT Feels like low power mode until I zip tied my PTU connectors she runs like a champ now

[@chrisrobinson176]

Did u check ur plugs and wires? Could be a problem there.

[@MiguelDsm]

Plugs and wires have been recently done

[@chrisrobinson176]

Ok. Maybe check Injectors, distributor,, check compression if u haven't yet. Hopefully those will help

[@MiguelDsm]

Thanks for the insight!

[@silnicnipirat]

I love this car. Is it really so hard to keep it alive, because it is so complicated? In comparison with other sports cars from that era.

[@MiguelDsm]

I don’t think it’s hard to keep alive. It’s the lack of interest people have to work on it. I do believe these cars almost have a cult like following. You won’t see the mainstream KZbinrs build them

[@billwise3002]

Big thing is regular maintenance. Not uncommon for these cars to be neglected. I just bit the bullet and did the full 120k service and replaced every sensor and hose including head gaskets and stem seals. Now it runs like a dream, and I intend to keep it that way.

[@Cargojojo]

It’s was wasn’t that wire with 3000gts or any Mitsubishi cars when your e brake is up all the way there a thing that makes it not start I got a couple Mitsubishi’s they all do that

[@Ohkayyjay]

I need to get an alignment on my car cause as well 😅😅.Also if you get that fd rx7 that’s would be dope 🔥

[@MiguelDsm]

Go to Monrovia alignment if you’re in SoCal! Fd is on my bucket list of cars for sure

[@Ohkayyjay]

@@MiguelDsm I’m all the way on the east coast hermano 🤣but the fd build should be lit

[@javier9082]

Check the gap on the plugs

[@Roscoc5]

is it running all cylinders?

[@corndogko1661]

On other cars like subarus the maf pipe/flow is directional and wouldn't run correctly if it was backwards...idk I'm a hammer

[@troydarnellknight]

it sounded like mine when my plugs got wet. make sure there is no moisture on your spark plug wires. that's exactly what mine was doing. change your wires.change your spark plugs and wires.

[@MrMegatron85]

i found a vr-4 near me with 50k miles and it looks pristine. kinda wanna trade in my new rdx for it

[@josephnorman8657]

have you changed the electronic distributor

[@MiguelDsm]

Ptu? No I have not

[@josephnorman8657]

Could be electronic firing issue or fpr fuel pressure regulation issue also had these issues with my vr4 like yours could be the problem

[@MiguelDsm]

Even though I already replaced the FPR? I can look over everything again, but it started doing it after removing the cat

[@josephnorman8657]

Oh really that could also be a tune issue for these cars it heavily relies on these systems to work properly so doing a tune to delete the cat systems could do the trick

[@MiguelDsm]

Gotcha. Thanks for the insight!

[@druunderwood]

what ECU are you running?

[@alexconti5231]

I know everyone just tell you that the ecu Bla bla bla, but is true. Here in Italy a lot of people losses his mind to find a problem that was caused by the ecu capacitor leaking

[@itstim8690]

Super annoying as i had a 96 eclipse that did the same thing and with no fix i got rid of it.

[@SpaceRanger187]

make sure all the grounds are clean or add more and remember shit brakes, its just part of the game, dont let it get u down

[@ararson4710]

Vacuum leaks, bad fuel, spark plugs and coil, valve guide, valve timing, maf sensor, bad sensor O2 , Af. Wiring due to bad connection. Transmission can cause a mifire as well.

[@red_dragonracingsilvereclipes]

Feel for you miguel man i had to deal with that shit with my moms car she gave me when she left the state man kept jerking and i thought ok better grab me some injector cleaner and new filter and see if that fixs it that didn't work came home one day and went to jump in to go grab some grub and no start took me two days before I finally found the dam issue two broken wires to the battery that powers up the dam starter solenoid.

[@MiguelDsm]

It’s always the smallest things that hold you back man

[@red_dragonracingsilvereclipes]

@@MiguelDsm yeah it is and when her house burned it took my scan tool with it so what a freaking nightmare figuring out what it could be thank god for ford tech manuals talking about the issue of the no starts.

[@MrDuhfactor]

Coil pack??

[@MrDuhfactor]

Every misfire I had on my DSM's unfortunately ended up being a coil pack....lol... Unfortunately, I lost a lot of hair only to find out that simply replacing my plugs and coil packs fixed it every time..... I finally learned to read the code to figure out which cylinder was misfiring the most, and swapp that cylinders coil pack with a cylinder that was not misfiring, and if the car misfired on the cylinder that I moved the suspect coil pack to, then I knew that was the one to replace. Good luck Homie... you'll get her figured out....

[@MiguelDsm]

Those are next on the list. Thanks for the insight man!

[@tamingguppies]

Spark plugs and coil pack can cause misfire and No Cel

[@MM12684]

You need the 99 sail panels bro

[@livinlikelarry8782]

Those filters you have to oil ruin maf sensors

[@gordona7081]

I’d check for a boost leak and or fouled plug.

[@tylercooper1058]

I'm willing to bet either PTU or possibly ECU.

[@MiguelDsm]

That’s what I’m leaning towards

[@tylercooper1058]

@@MiguelDsm hope it gets sorted out buddy. Idk if your on the book of faces, but there are a few groups dedicated to the 3s and they are a wealth of knowledge. I know a few that can give recommendations on rebuilding ecus. I recently seen someone say they ordered a ptu from rock auto and it looked like a oem part too. I wanna do a channel for mine, I just suck with a camera and editing.

[@MiguelDsm]

Yea I’m on the groups. I tend to stay off FB though haha. Having a channel ain’t easy many. You double the time and effort just to record everything

[@S_U_P_A_S_T_A_R]

Please don't install 99 sail panels on the 3S, hate them Camaro looking ugly things, this car looks so good as is just hope you can get that misfire figured out, that reminded me of when I had my 3S and had a similar problem that I couldn't figure out ! ! Lol Keep up the good work !

[@King_Rematch]

Yerrrr!!!!!!!

[@stacybolden5665]

Sounds like a coil failed or spark plugs Hella fouled out.

[@davidholden1058]

its a induction leak after the maf