CEL - misfires

kcc0521 · Aug 7, 2017

mikeD4V said:
I got the car back and dealer said they replaced the pcm, not reflashed it again, but haven't provided the work order yet. I'll call and ask them for it again today to verify what was done. That being said my misfire is gone and they also got my 2012 tpms sensors to function which was a cool bonus. Whatever they did has worked so far and I'll be happy if it doesn't return.

Haven't been able to put too many miles on the car yet but did keep it a 3.5k yesterday on the highway cruising home (~10min) and it didn't start misfiring like it used to. I'll put a few hundred miles on it and post again.

Is the car still running ok after replacing PCM? My buddy Tommy V is having the same issue. It is driving us crazy. His started after a clutch replacement too.

mikeD4V · Aug 7, 2017

kcc0521 said:
Is the car still running ok after replacing PCM? My buddy Tommy V is having the same issue. It is driving us crazy. His started after a clutch replacement too.

Forgot to update. 2nd dealer determined the injector driver in the PCM was the failure so they replaced the PCM under warranty. Car has been running fine for 13 months and over 11k miles.

Tommy V · Aug 10, 2017

Any of u guys still having misfires or cel light,especially after a tune or clutch replacement??After 2 weeks i figured mine out and may be able to help u out.

Kenny_S550GT · Aug 16, 2017

Took mine into the dealer i originally purchased from yesterday for the P0308 Code. Scantool I have showed it appeared 3 times. Still waiting to hear what they found. Only mod on the car is a MBRP Stainless Street catback. Car has never been tuned and is currently at 8,500 miles.

Kenny

antgoat1483 · Sep 16, 2017

Tommy V said:
Any of u guys still having misfires or cel light,especially after a tune or clutch replacement??After 2 weeks i figured mine out and may be able to help u out.

Did a clutch replacement on 09/16/2017
CEL appeared on 09/14/2017
will go to dealer next Monday

Mvalenti · Sep 18, 2017

Posted this to another thread...
CEL came on early this year (misfire P300, P305, P308), dealer downloaded software to fix.
A few moths later came back on, same codes. Dealer blamed it on fuel contamination (dirt) at my expense, new injectors and pumps... I mentioned an issue with the intake manifold valves, they said it couldnt be that...

53 miles later back on, guess what the problem was.... damaged valve on the intake runner...

job · Sep 19, 2017

Mvalenti said:
Posted this to another thread...
CEL came on early this year (misfire P300, P305, P308), dealer downloaded software to fix.
A few moths later came back on, same codes. Dealer blamed it on fuel contamination (dirt) at my expense, new injectors and pumps... I mentioned an issue with the intake manifold valves, they said it couldnt be that...

53 miles later back on, guess what the problem was.... damaged valve on the intake runner...

Was this it?

Mvalenti · Sep 20, 2017

job said:
Was this it?

yes

Sargonnas · Oct 9, 2017

I've got the same issue. Started with Cyl 7 & 8, but after those were cleared only 8 came back. Found it happened at around 1900 RPM. 6th gear @ 65MPH on cruise control and it will start misfiring. Been to the dealership a bunch. On my second dealership now. This one thinks its some bad latches that hold the IM down or something. They'll replace it Wednesday. Unfortunately, if this doesn't fix it, I believe its eligible for lemon law. Love the car, but I've never had so many issues with a new car before (this isn't the only issue).

usgiorgi · Oct 9, 2017

Sargonnas said:
I've got the same issue. Started with Cyl 7 & 8, but after those were cleared only 8 came back. Found it happened at around 1900 RPM. 6th gear @ 65MPH on cruise control and it will start misfiring. Been to the dealership a bunch. On my second dealership now. This one thinks its some bad latches that hold the IM down or something. They'll replace it Wednesday. Unfortunately, if this doesn't fix it, I believe its eligible for lemon law. Love the car, but I've never had so many issues with a new car before (this isn't the only issue).

Mine was doing this and it was a cracked intake manifold.

Sargonnas · Oct 12, 2017

Looks like they finally figured it out. Broken IMRC lever. Replaced the IM and I no longer get the codes.. car also feels like it runs a bit smoother.

Sargonnas said:
I've got the same issue. Started with Cyl 7 & 8, but after those were cleared only 8 came back. Found it happened at around 1900 RPM. 6th gear @ 65MPH on cruise control and it will start misfiring. Been to the dealership a bunch. On my second dealership now. This one thinks its some bad latches that hold the IM down or something. They'll replace it Wednesday. Unfortunately, if this doesn't fix it, I believe its eligible for lemon law. Love the car, but I've never had so many issues with a new car before (this isn't the only issue).

CEL - misfires

kcc0521

Well-Known Member

mikeD4V

Well-Known Member

Tommy V

Well-Known Member

Kenny_S550GT

Well-Known Member

antgoat1483

Member

Mvalenti

Well-Known Member

job

Active Member

Mvalenti

Well-Known Member

Sargonnas

Active Member

usgiorgi

Well-Known Member

Sargonnas

Active Member