Misfire Counts On All Cylinders

[Torinate]

Really
Hoping this does it for you! That is likely my next move as well.

Got a part number for them? Where did you order from?

Thanks!

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[19gtMD]

I had issues very similar. I had a guy in my area that was awesome with knowledge on the coyote. My issue ended up being oil in the intake manifold, that migrated down to foul my plugs. Got new plugs, pcv valve and catch cans passenger and driver side. Havent had an issue since.

 

[Fat_Joe]

Really
Hoping this does it for you! That is likely my next move as well.

Got a part number for them? Where did you order from?

Thanks!

I really hope so too. I don’t necessary have a part number. But I got them from American Muscle:
https://www.americanmuscle.com/ford...trength-vct-solenoids-1117-gt-1519-gt350.html

 

[Fat_Joe]

I had issues very similar. I had a guy in my area that was awesome with knowledge on the coyote. My issue ended up being oil in the intake manifold, that migrated down to foul my plugs. Got new plugs, pcv valve and catch cans passenger and driver side. Havent had an issue since.

Very interesting, I did notice quite a bit of oil residue in the old intake manifold (no catch cans). But I changed out the plugs and the original plugs looked pretty new so I don’t think fouled spark plugs is my issue. I will be getting catch cans for sure asap. But I want to fix the misfire before anything

 

[BlackandBlue]

When you installed the new intake did you put the injectors back on the same cylinders?

 

[Fat_Joe]

When you installed the new intake did you put the injectors back on the same cylinders?

When I switched the intake manifold, I put new fuel injectors in. Same behavior as before unfortunately

 

[BlackandBlue]

Have you looked into replacing the fuel injector wiring harness?

I have a suspicion this might be pinching or somewhat broken wire in the coil or injector system.

If you know someone that has a scope you could tap in and watch the injector or coil signals in real time.

 

[19gtMD]

Very interesting, I did notice quite a bit of oil residue in the old intake manifold (no catch cans). But I changed out the plugs and the original plugs looked pretty new so I don’t think fouled spark plugs is my issue. I will be getting catch cans for sure asap. But I want to fix the misfire before anything

I dont know if you looked down the spark plug holes to see if there was any residue or oil in the holes.

 

[Fat_Joe]

Have you looked into replacing the fuel injector wiring harness?

I have a suspicion this might be pinching or somewhat broken wire in the coil or injector system.

If you know someone that has a scope you could tap in and watch the injector or coil signals in real time.

i might have to look into this when I put the car back together. I have the Valve covers off and waiting for parts to come in has I am also going to replace all camshaft position sensors (2 intake and 2 exhaust) along with the vct sensors It’s a waiting game at this point

 

[Fat_Joe]

Update.... replaced all the sensors (2 intake and 2 exhaust cam shaft sensors along with all 4 vct solenoids) annnnnnddd still misfiring under the same conditions. Even performed a crank relearn after replacing all those sensors. I feel defeated

 

[Torinate]

Crap! I was hoping that was going to fix it for you. Then is would give me some hope that that’s what my issue is.

Sucks bud. What next?

 

[Fat_Joe]

Crap! I was hoping that was going to fix it for you. Then is would give me some hope that that’s what my issue is.

Sucks bud. What next?

At this point, I haven’t come with a plan yet. I am running out of options. What have you done so far?

 

[ice445]

I'd be suspecting an electrical issue, either wiring, grounding, or simply a bad PCM

 

[Torinate]

At this point, I haven’t come with a plan yet. I am running out of options. What have you done so far?

New plugs. Cleaned injectors, smoke test x2, cleaned MAF, new TB, switched coils around x4, compression test, scoped the cylinders, KAM reset x3, crank relearn x4, numerous logs and mode 6 data.

Nothing makes sense. Misfires galore at idle. Nothing under strain when it is more likely too. I did see one during a pull in a log though. No cels. Lamda is excellent. STFT are fine. Same as when initial logs were done.

I do here small pops idling and have had some backfires on decel. I’m out of options as well. Was hoping the VCTs did it for you then I would have given them a go.

 

[Cobra Jet]

Check this thread, not sure if it will have any benefit to you, but seems the SSM was released for a reason… so definitely check your vehicle since you did a lot of top end work…
https://www.mustang6g.com/forums/th...-5-0-2017-2021-errors-p0087-and-p008a.167284/

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