Quote:
Originally Posted by BMW Maniac
The engine is seeing "x" amount of air, and is delivering "y" amount of fuel. "Y" is either correct according to the tune, according to what the ECU thinks the engine is seeing via the MAF, or what is limited by the fuel system.
Here is how I'd attack it and whenever I have problems on my turbo M3, this is my methodology:
1) Vac test.....usually, in boost, the engine will run rich because the accounted for air is leaking out in boost, but the fuel has already been provided...still, always check first and eliminate this as a potential issue...many people also want to assume away this problem...smoke test!
2) Fuel pressure check...what should it be idle, accelerating, in boost? Need to verify the fuel pump, FPR, injectors are all in compliance.
Good luck, and please let us know what you find out once this is resolved!
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Great info! Simple and to the point.