2008 Ford Edge Misfire (Faulty PCM/Melted Ignition Coil)

2008 Ford Edge 3.5L
Identifying a single cyl misfire using cyl drop test (on accessible cylinders), using a low amp probe to show ignition coil current ramps on a design where you cant access all the cylinders, and to verify computer control and driver integrity. Thanks for watching.

[@FordTechMakuloco]

All too common same on the 3.0L. Ford recommends pcm replacement, all coils and even spark plugs on some years and engines to prevent a repeat occurrence. Great diagnostics you nailed it on the head!

[@PositiveLeadDiagnostics]

Thanks for your support. Yeah I was forced to keep it as cheap as possible. But I did warn them it could happen again.

[@petar443]

what if one changes spark plugs every 10000 miles?The problem occurs again?

[@aviator1683]

FordTechMakuloco I have a 97 Ford Taurus 3.0l that doesn't have spark out of the coils and the MIL light doesn't show on the cluster. I did check the crankshaft sensor and I can see the signal, I also noticed that the injectors have pulse signal,but on the wires coming front the ECM to the coil I have 12 volts all the time and it never switches with the engine cranking. Could it be the ECM problem?

[@troymcker4244]

FordTechMakuloco

[@66crush9]

Then Ford needs to foot the bill with a recall IMO...

[@guayaco-dm3vu]

Just came here after watching the Paul Danner rv trip.. Seeing this issue is all to familiar now..All I do now is check for control on this misfires when I get one of those codes... Milans/mkz were the first to come out with that tsb then mkx/edge which said to replace all coils,pcm and plugs but after a while they only wanted you to replace affected cylnders .. Paul did a great job with you guys Wish you all the Best.. Happy Thanksgiving.

[@PositiveLeadDiagnostics]

This one was the first I have had to deal with. I now see this was or is a common issue. I didn't know about the tsb until after. Thank you for watching and supporting this channel

[@lucianlucian9911]

I just came across your channel by watching Paul's latest video at this moment. Nice job man, one can readily tell that you were a student of his, I can see the same great diagnostic technique and skills that I've seen in his case studies. Cheers!

[@PositiveLeadDiagnostics]

Thank you very much!

[@8power0]

That is something i can't believe that the snapon being so expensive could not program that ford escape pcm and keys and also being such an older vehicle . Very good video please keep up the great work i have done the programming with my autel and thanks for the video .

[@PositiveLeadDiagnostics]

Thanks for the support. I wish I could program with the verus but I have a friend who does aftermarket programming

[@gace1966]

I have same problem on 115000 km,nice video and explenation .100 % same problem i can’t believe what s wrong with this part.Thank you budy for this video.

[@HomieHektor]

Hey PLD just found your channel, I've only seen one video and I gotta say 'I'm in'...I subscribed and I'm gonna binge watch to keep me busy. Thanks for sharing 👌🏼

[@PositiveLeadDiagnostics]

The Homie Hektor thank you I appreciate the support.

[@MACTFordEdge]

Been addressing this same issue with group members and subscribers on the 1st Gen Edge's. Once that coil over heats it takes out he PCM with it. Great diagnostics by the way. MACT

[@PositiveLeadDiagnostics]

Thanks for the support. I figured the coil took out the pcm. I did hear that the drivers can be stuck on. Idk how true that is though. Unfortunately kept it low cost and replaced only the faulty coil and a used pcm. I still have the old one. Il look into repairing it if it happens again thanks for the tip.

[@MACTFordEdge]

Unfortunately the owner will be back and most likely with the same issue and Coil #2 will be the most likely failure. #1 and #2 seem to be affected by the heat that his captured under the intake. Hopefully when #2 goes it does not take out the PCM again. I took my 2008 Edge to 285,000 miles without a PCM or Coil failure. If you get a chance check out my YT dedicated entirely to the Ford Edge. Again you are great diagnostic technician.

[@PositiveLeadDiagnostics]

I know the owner so I can possibly do number 2 as a preventative repair if allowed

[@coinvault4379]

Is replacing the PCM expensive? Our mechanic said it was a "dealership only" job. Our Edge was in yesterday for the exact same thing in the video.

[@PositiveLeadDiagnostics]

I have a friend who does programming in the aftermarket and he did me a favor and programmed it for me. Other than that I believe the only other way would be going to the dealer

[@edwinortiz982]

Hello I wanted to thank you for all the help you have given me and for taking the time to answer my questions you know I finally found the fault of my car is a Ford Edge. 2007 that I did not start and appeared the immobilizer you know was the connector of the transmission that was failing I realized for one day I take it out and lost power in powertrain and I put the scanner and I said that it is not solving signal the coil of the Transmission thanks for all your help

[@PositiveLeadDiagnostics]

Nice. I'm glad you were able to figure it out

[@edwinortiz982]

Thanks for responding as I live houston texas I could not bother to stop seeing I can run my car or give you an idea that can be because when the weather is hot it works fine but when it gets cold it fails

[@PositiveLeadDiagnostics]

When it fails. Do you have communication to the pcm?

[@sebby42603]

I just found your channel after seeing you on scanner danner , great video . The plug gap gets excessive and over stresses the driver which makes the driver stick on and melts the coil . I had them holding a ground with the key off, got to at lease put new plugs in or the problem will reacur. The plug gap is usually huge. The last one I seen had 3 bad drivers with cylinder 5 stuck on with key off . 6 coils 6 plugs and pcm.

[@markmiller9894]

I just asked the question how this happens, then found this post. was curious what was melting the coil. mine is cylinder 5 also and .080 or more gap on the plug

[@edwinortiz982]

The msj to pull when it is scanned is that the board is bad that the current is going to ground and the dashboard of the car when the fault starts tells me to check the brake system

[@PositiveLeadDiagnostics]

Maybe a module pulling down the can network?

[@johnfritz3792]

My coil looks identical to yours, 2010 mkx, ordered a new pcm from the ford dealership, $618. With tax and I’ll have to have it programmed after it is installed

[@edwinortiz982]

Thank you for helping us by uploading videos.

[@eliasaviles9069]

im having the same issue with cylinder #2. found the coil busted up similar to yours. i dong have much access to the wiring diagrams and would like to know if you can point me in the right direction to acquire those schematics you were looking at. additionally, can this test be conducted with a multi meter? thanks you in advanced.

[@edwinortiz982]

Gracias lo hare y de cual resultado para tendreme informado y espero me siga guiando para poder resolver mi problema la verdad gracias y dejeme decirle que es muy profecional en su trabajo

[@Captain_Brown_Beard]

Mine ha this issue. I think its because I didnt change the plugs in time and the PCM was sending too much power to the coils

[@vhaunwhyte7253]

have one question can burnt ignition coil be cause by low compression in your cylinders had 2 coils from #6 cylinder melted taking my mazda 6 to a shop the guy say he’s going to do a compression test but isn’t low compression a mechanical issue and melted ignition coil and po356 codes a electrical issue?

[@JoesAutoElectric]

Ya just got to love when a coil takes o0ut the pcm man....

[@PositiveLeadDiagnostics]

lol right on, makes for a fun diagnosis

[@02lowrider62]

Very good video but would have bin much easier to figure out if you put a second channel on one of the front coils to figure out which coil ramp was missing

[@barbaricbarbosa]

If I get new PCM from this website that requires your vin so they can program it for you when they ship it I’ll also need to reprogram my keys once new one is in right ?

[@edwinortiz982]

Thanks I will do and from what result I will have informed and I hope to continue guiding me to be able to solve my problem the truth thanks and let me tell you that he is very profecional in his work

[@edwinortiz982]

I want to ask you a question, you remember that check the ground of the computer, no. There was dirt had corrosion where they were connected to the chassis clean them and add another earth plus the car I was testing it distant 4 days and was working well until yesterday that bine on the night of work I turned it on and started but I went for something next to the passenger and I put my hand where the passenger's airbag goes and the fault came back when I saw that I punched the air bag and began to work well I was curious and moved the cables that go to the passenger airbag and the Car again gave the same fault and today no longer starts

[@laurenternstlouissaint7566]

Hi man, I have a 2009 Linciln MKX ( the same) it's has that same problem on cylinder 5, I change coil and spark plug, it's still shaking. can you give me an advice please ?

[@99rattle]

AS shorted coil would leak voltage to the negative control ?

[@angelisone]

Help on 2010 Edge Limited AWD, is spark park #5 is the center one (5:26)?

[@abubakariabdulai5904]

Hi sir, I had this problem with my 2008 Ford edge sel but I changed the platinum plugs and melted Ignition Coil and when I start the engine on, I can see that the engine is shaking please any information that can help me.

[@trainer2018]

Does Ford know exactly why this problem is happening? Maybe next time when you get the same vehicle in again you could scope the secondary and see what the burn time is at. I'm wondering if the Engine is running leaner by this design and causing the coils to overheat.

[@PositiveLeadDiagnostics]

I have heard 2 theories. One is that these ign coils on the backside of the head get alot of the heat and it causes them to melt/short. The other is that the computer driver gets stuck on and it burns up the coil and the driver. Not too sure but that is what I heard

[@vhaunwhyte7253]

one question have a mazda6 can low compression in one of your cylinders cause fault code and burn ignition coil?

[@edwinortiz982]

Because I do not know if the module of the airbag is the cause of the problem because in the Ford I had already been told that I was failing what you think

[@PositiveLeadDiagnostics]

You think the airbag module is pulling the network down? Unplug the module

[@encouragementdaily3558]

PLEASE HELP!.. I have a 2008 Lincoln MKX with the same problem cranks-up find but after about 30-35 min it starts running rough and shaking with engine light on and blinking. I have had it diagnosed twice the first time they said it was showing to check codes Po204, Po205, Po304, Po305, Po115 which they did but said all where find and [Po174 the system to lean] then the computer but they don't do that type of computer work. the second was the dealer and they diagnose it as being the #4 fuel injector is bad. and also recommend a tune-up. So, my question is should I just go ahead and replace the pcm and all the coils and spark plugs because after seeing your video and reading the comments that's what I'm thinking. THANKS FOR RESPONDING BACK.

[@PositiveLeadDiagnostics]

It looks like you have a few injector circuit faults and misfire faults that correspond with the injector faults. If your vehicle runs ok when you first start it, then your pcm is fine. I would be looking at the injectors. If this is the same design as the ford the. I would also do a tune up while it’s apart or Atleast get the old coils out and get the updated ones installed

[@encouragementdaily3558]

@@PositiveLeadDiagnostics Hey, Thanks for responding I have already ordered the PCM, so I guess I'll have an extra one if I don't have to return it as a core. I also have the spark plugs and ignition coils coming in as well along with new fuel injectors. As I decided to go ahead and replace all the injectors. And yes, at first I was thinking that nothing was wrong with the PCM. And I just needed to replace that one fuel injector and do a tune-up. but after watching some videos on the subject were they replaced all spark plugs and ignition coils and it still ranked rough until they replaced the PCM. I was thinking of just being on the safe side. Thanks again for responding.

[@justinballard2168]

On your scanner you could have went to generic functions and looked at misfire counters

[@edwinortiz982]

I will thank you, I will inform you of my progress

[@MattRocksGames]

HOW MUCH DOES THIS COST? I SEEN THE PCU’s ON EBAY / AMAZON ETC, for $199. Labor should be about the same. SO IS IT $400 TOTAL??

[@edwinortiz982]

Those are the ones that gives with respect to the short circuit

[@PositiveLeadDiagnostics]

There is a power supply missing or shorted with those lighting circuits. You need a wiring diagram to start trouble shooting that and it seems that could be a different issue than the no start

[@tabrox]

Same problem here. What can One Expect to pay for this repair? Thank you

[@troylehman5471]

Just found your video. Great job and thank you!! One question. Are there 2 different firing orders for the Edge? I find one online that indicates 123 in the back and 456 up front then there’s one that shows 135 in the back and 246 up front

[@PositiveLeadDiagnostics]

I’m not sure how they have that set up. I guess it could go either way.

[@edwinortiz982]

Not disconnect all the sensors on the board turns on all the lights the only thing that does not go off but if the payment no longer starts because the immobilizer appears to me and does not start no more several days without starting

[@JOHNPHUFNAGEL]

Why would Ford recommend changing the pcm if its not bad? A pcm wont cause a coil to fail. Great video man! I need to get the courage to start filming because the shops I do work for give me some crazy ones

[@PositiveLeadDiagnostics]

I'm not sure how true it is but I heard some of the pcm drivers fail and basically stay on which would cause the coil to burn up. Maybe they were not sure on what was causing the issue. I guess it could go either way. I don't know how true that is.

[@JOHNPHUFNAGEL]

+Positive Lead Diagnostics I never gave that a thought about it staying on and smoking the coil but a good tech would or should be able to spot that right away.

[@PositiveLeadDiagnostics]

I think in either case it wouldn't matter. In the end your still going to have a faulty pcm and coil. I'm sure it wouldn't take long for the driver to cook if it's staying on

[@MACTFordEdge]

Replace all the coils. Those back ones get all the heat. Most common coils to fail on the 1st Gens are #1 and #2. PCM can be repaired quickly and economically through circuitboardmedics.

[@edwinortiz982]

Hi I was watching your video and you know that I have a problem with my Ford Edge 2007 that loses the pcm connection with the modules I have changed pcm board and internal fuse box the immobilizer module as it works fine but at the moment it fails and appears Immobilizer activated I went to the Ford workshop and they wanted to change the board again please have some way to help my mail is [e-mail] I would greatly appreciate your help

[@marcoburdi3369]

2008 Ford Edge AWD... OK. Need opinion.. Here goes.. I replaced #2 cylinder 3 times in a short time....The 3rd time I just switched it with #4 (2 spot is an old one now... 4 is the new one that car said burned out) It's a week later.. #2 misfire with the old pack now and #4 with the new pack is fine.. I think the problem is the #2 cylinder.maybe damaged inside maybe? All plugs are new. Can someone pinpoint exactly what's wrong?If that's enough info for an exact pinpoint answer that would be awesome.

[@PositiveLeadDiagnostics]

You have a reoccurring misfire on cyl2? And you have replaced the coil multiple times?

[@yonatanbeyn8557]

Use the same procedures like what Tom is doing!

[@Prodigy_Trading]

@positive lead diagnostics I have this same problem on the 07 MKX with smoked coil on cylinder #1 except my #17 pin shows a solid ground instead of pulsing ground as it should be. Does a bad PCM cause this as well or is there a possible different cause?

[@PositiveLeadDiagnostics]

So on one side you have constant 12v and on the other you have a constant ground? I have heard of pcm drivers being stuck on. Could be a computer issue

[@Prodigy_Trading]

That was my conclusion as well. Thanks for your response.

[@edwinortiz982]

Thank you, I will have informed you

[@edwinortiz982]

Hello you know I have a question I hope that when you can answer me you know that I put the scannner to my car is the Ford Edge 2007 I commented that it did not start and I throw that I have a short in the light system but I was measuring with my tester no I know if it is normal that the hot of the front lights I measured it with the positive one in the battery and looking for the ground knows that the positive one worked to me like ground I do not know if it is correct

[@PositiveLeadDiagnostics]

What is the code

[@hxc7273]

I've seen this before on a Mercury Milan. Ford had a TSB for that car. Replace PCM and all coils because they kill modules.

[@hxc7273]

And yeah it smelled horrible haha

[@PositiveLeadDiagnostics]

absolutely smelled horrible, I heard about the tsb after I had diagnosed it, I did want to do all 6 but money was a factor, kept it low cost, keep our fingers crossed

[@howtobeahumanbeingagain6024]

13:19 i missed something what happen for the signal to go from ''0'' to ''14 volts'' ?

[@rassielcoto9385]

Is it possible that the PCM shuts the coil off when it sets a code just like it does with the injectors? I mean i would have cleared the codes and then look for control to that coil before calling a PCM, and of course checked the coil

[@PositiveLeadDiagnostics]

Rassiel Coto I can't argue that but I have never seen the coil control be turned off due to a misfire. Injectors yes. But if that were the case on initial start up I would have had all 6 current ramps and then the pcm would have shut the control off after it detected the misfire. I don't know if i had the initial start up filmed when looking at the current ramps. But I never had control at any time. Clearing faults may not have been a bad idea but I don't think it would have helped me or changed the direction I was going anyways.

[@PositiveLeadDiagnostics]

Rassiel Coto another thing to is that my cylinder drop test I did on the front cylinders. I was unplugging coils and I never lost my control after creating those faults. If the pcm was shutting coil control off after a fault sets then when I plugged my coils back in I would have created more misfires

[@edwinortiz982]

If you already replace the pcm and the board because I had the same problem before and first changed the pcm and returned the same failure they decided to change the board and I turned the same fault but if they disconnect the pcm for a few minutes in car starts but soon Time again gives the same fault

[@PositiveLeadDiagnostics]

What checks have you done when the problem occurs? Do you have 5vref when this issue happens?

[@philh9238]

nice. would the pulsed ground be a square wave on the scope going from 14 volts to 0?

[@PositiveLeadDiagnostics]

yes it would, ecm turns it on (pulls it to ground) then when it turns off is when the coil is fired

[@FinalStopMobileAutoTech]

Awesome video my man!! Awesome content!!!

[@kellyr9388]

Great video as always..

[@JJ-sv2qz]

I replaced all coils and plugs after getting this issue. I started the car and it still misfires. The PCM is fried I think. What are the chances I fried the new coils by running it for a few minutes with a bad PCM?

[@PositiveLeadDiagnostics]

If the pcm was fried from the old coils. Whichever cylinders are misfiring, my guess would be the drivers in the pcm are what’s causing the misfires. So you would need to replace the pcm and get it programmed. The new coils should be ok. It would be an easy check to see if there is control to the coils on the misfiring cylinders

[@JJ-sv2qz]

@@PositiveLeadDiagnostics Thanks for the info. There was something I was reading on a website saying not to run the car with bad PCM and good coils or you could reverse fry the coils again after replacing. I put all new plugs and coils and the PCM is actually being repaired, if possible, by CircuitBoardMedics.

[@2eagle86]

I have the same issue with my 07 ford fusion 3.0, no power to the number 2 ignition coil...all other coils are getting power but I got this po352. The car has 262K miles on it and the coil did the same thing as what your coil did. Could this mean I need a new pcm?

[@PositiveLeadDiagnostics]

It is possible. You need to check for control to check the pcm driver. Amp clamp or a volt meter will work.

[@PositiveLeadDiagnostics]

No power to the coil? Depending on circuit design it could be a wiring issue. Do all the coils share the same power supply?

[@2eagle86]

I'm pretty sure they do, only way I can tell if power is goin to that coil is a scope on a rope. everything I turned to all said pcm...

[@PositiveLeadDiagnostics]

Do you have power to the coil? If you have power then you need to check pcm ground. If you don't have power then there is a wiring issue

[@99rattle]

Hi, just a question about the the shorted coil , was just wondering if you did a unplug check to the coil on ground switch wire? as didn't catch you say anything that all.

[@edwinortiz982]

In which part is located this module

[@feeneysmechanical6215]

Great video btw

[@TheGb50]

This all can be done with a test light in 5 min

[@djstatyk1540]

So should i just go ahead and change the PCM and COILS?

[@PositiveLeadDiagnostics]

I think there is a tsb. Not sure if there are updated parts to prevent it from happening or if it's a tsb that just states if you have this problem then change the pcm and coils.

[@markmiller9894]

Can some one explain how the PCM melts the coil. whats going on exactly ? I thought it was a case of a bad coil, ( original was melted ) I drop in a new coil still had the misfire . I had checked the plug but I'm thinking it must be bad too. so I pull the coil to put in a new plug and after less than 20 min run time the new coil was melted and smoking. So I got on line and found this video . Im not doubting that 6 plugs and coils and a computer is my fix I'm just trying to understand the mechanics behind if the driver in the computer is bad how the new coil melted Mine was 5 and 6. new coil fixed cylinder 6 but new coil 5 died a horrible death.

[@PositiveLeadDiagnostics]

I read that the pcm driver can get stuck on and burn up the coil

[@davidhall3747]

@D The Driver is Ground side switched. It means the Driver is not pulsing on and off. If the Coil is activated constantly, it will burn up quickly. Pulse Width Technology.

[@jjyemg2397]

Why does the coil melt?

[@stevet1754]

Spark gap gets to wide causing the coil packs to overheat due to the larger gap. Coil pops and back feeds voltage to the ecu blows the drivers for the coils then if bad enough supposedly can fry injectors.

[@jjyemg2397]

Thanks Steve T!,

[@elbrouse1]

Because of cheap Ford-Chinese coils...

[@toniharris379]

what state r u in, because i have the same problem..?

[@PositiveLeadDiagnostics]

Pittsburgh Pennsylvania

[@desertfox4273]

im having this same problem but i got p2195

[@laaribi_abdo]

what's the mode 6

[@edwinortiz982]

B1696,B2479,B1578,B1472

[@jptrustno1]

Fuse box with only numbers. Makes u think why would any car manufacturer only put numbers.

[@Airman..]

Transistor inside the pcm probably took a 14v straight up without a load in between and got tasted like turkey

[@PositiveLeadDiagnostics]

the melted/shorted coil caused higher amperage (basically a short to ground) and burned up the driver in the pcm

[@Airman..]

Positive Lead Diagnostics actually the ignition driver is protected against high amperage draw.. if you still have the coil on hand a continuity test between its inputs and its single output should tell what exactly went wrong.. very common issue with Fords

[@PositiveLeadDiagnostics]

It's only a 2 wire coil the only input is the ground control from the pcm driver. The coil melted and shorted which caused a huge amperage spike and burned up the computer

[@elbrouse1]

Problem’s cheap Ford-Chinese ignition coils...

[@edwinortiz982]

No communication with pcm

[@PositiveLeadDiagnostics]

When that happens check powers and grounds at the pcm

[@bryanclinton4900]

Tsp look at that first. Want to save you a lot of time

[@fprice6519]

frozen

[@figurado1]

I can't understand a thing you are saying.

[@PositiveLeadDiagnostics]

Lol why is that