GreenS-10

iTrader: (4)

Took Tams SS to the track this weekend and made 4 passes. On the last pass the performance was sub-par since she spun the tires pretty bad but as she was turning on the return road the car wanted to stall. When she got back to the pits it was obvious it wasn't running on all cylinders so I assumed it killed the plugs. After we got the car back to the house I pull all the plugs out. All the plugs look fine (all the electrodes) but it was a little rich and wet from fuel on some cylinders. It is running on 1-2-4 only. Cylinders 3-5-6-7-8 are cold to the touch when the motor is running. I replaced the crank sensor, cam sensor, map sensor, unplugged the maf, replaced the injectors, pulled the fuel rail off while fuel system was pressured up to see if any injectors where stuck open and tried another computer (out of a stock car so it would only fire up and then die since the parameters where different but could tell the problem was still there). I also threw a different tune in the current computer to try that. I have also checked the coil packs for spark with a spare plug and they seem to be fine. I looked at the reluctor wheel with a bore scope and it has all it's teeth. Crazy thing about this is the dead holes are cold to the the touch but when you unplug the injector the header tube starts to warm up. I am grasping at straws now and was wondering if anyone knows what it could be. I have checked the obvious grounds also with nothing obviously visually wrong.

Bad Chad

iTrader: (94)

Have you checked all your fuses?

codyvette

iTrader: (24)

Do a compression check. I would be willing to bet it won't turn out good. That avatar got a lot of laughs from the guys here at work.

GreenS-10

iTrader: (4)

I checked all the injector fuses and ECM fuse. They were good.


I did a leak down on two of the dead holes and got 2% and 4% leakage on the two I checked. I didn't keep checking the reason.

Turbo_Stang

iTrader: (3)

Check your PCM to Head ground wire.Mine corroded and caused the same issue before on my camaro many years back

GreenS-10

iTrader: (4)

Just in case anyone is reading this with the same issue the problem turned out to be a reluctor wheel that was separating due to failed rivets that hold the two halfs together.