First off, this in in my M50 powered E34.
Trying to get my car to pass DEQ. Failed first try, then did the following and failed again:
Replaced O2 sensor
Replaced cam position sensor
Replaced VANOS solenoid
^^^ These three thought I had it fixed as the car runs much better now and I gain 4mpg.
Checked coolant temp sensor - Good
Check air intake temp sensor - Good
Check throttle position sensor - Good
Check wiring from all sensors to ECU
Swapped out MAF for a junkyard one - No change
Cleaned MAF, both original and junkyard one
Checked fuel pressure at the rail - Good while engine off and running
Replaced coils
Replaced spark plugs
Recently I've also:
Had injectors cleaned and flow tested - 1.5 years ago
Replaced fuel pressure regulator - 1.5 years ago
Replaced fuel pump and filter - 3ish years ago
Rebuilt Vanos - 6 months ago
I'm running out of ideas. I'm thinking I'll get it smoke tested to verify no vacuum leaks, though I don't think there are any. Only other thing I can think of is bad cat perhaps?
Trying to get my car to pass DEQ. Failed first try, then did the following and failed again:
Replaced O2 sensor
Replaced cam position sensor
Replaced VANOS solenoid
^^^ These three thought I had it fixed as the car runs much better now and I gain 4mpg.
Checked coolant temp sensor - Good
Check air intake temp sensor - Good
Check throttle position sensor - Good
Check wiring from all sensors to ECU
Swapped out MAF for a junkyard one - No change
Cleaned MAF, both original and junkyard one
Checked fuel pressure at the rail - Good while engine off and running
Replaced coils
Replaced spark plugs
Recently I've also:
Had injectors cleaned and flow tested - 1.5 years ago
Replaced fuel pressure regulator - 1.5 years ago
Replaced fuel pump and filter - 3ish years ago
Rebuilt Vanos - 6 months ago
I'm running out of ideas. I'm thinking I'll get it smoke tested to verify no vacuum leaks, though I don't think there are any. Only other thing I can think of is bad cat perhaps?
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