Description: after 20-30 minutes (or miles) of driving I will begin to get hard bucks (misfires beyond one cylinder) and eventually stall. The car will typically turn right back over - but stall after only a minute or so. If I leave the car off for around 15 minutes it will run fine for a while and then stall out again.
It sounds as if the car is running out of fuel which it is not. The pump remains primed and the pressure is normal.
What I’ve done so far:
- Fuel pump has been swapped
- Fuel filter has been replaced
- Fuel lines have been verified (even cleaned to rail - injector heads and intake manifold… It’s been a fun weekend)
- Fuel pump relay has been replaced
I have also recently replaced the ignition coil due to an unrelated issue for which I will provide detail so that you too can rule this out. I had random multiple misfires in bank 3 - replaced the coil and the misfires were gone. When the problem came back I was suspect of the new coil and originally believed that this had failed at temp. This coil has been tested hot and cold and passed each way. I also swapped out for the coil with the issue on bank 3 just to verify.
I have read in a few forums which point towards either the ASD relay (which I was also suspect of early in the process of elimination) itself failing when heated or the camshaft position sensor and or the crankshaft position sensor causing the relay to trip when they are heated.
If anybody out there has any input or a logical path of trial and error forward - all advice would be appreciated.