This is a rather unusual issue and I need some outside advice. I'm dealing with a 91 318i - I bought this to use as a donor for an early model that I'm putting together. I was aware that the car had a destroyed harmonic balancer when I acquired it. Since then, I have replaced the failed balancer with a used unit. While I expected it to immediately fire off, that was not the case. Instead, I was left with a condition which seems to mimic the timing being off - it will start and run for a second or two, roughly, and then die. Going down the rabbit hole yielded:
a faulty air flow meter (IAT was shorted, causing the DME to believe the incoming air was 355 deg. F)
damaged idle control valve wiring, which was repaired
fuel pressure verified at 45psi
timing verified (blocks on cams, pin in flywheel, index mark on balancer lines up w/arrow on oil filter housing)
Two intake leaks were discovered and repaired
A compression test was performed (obviously cold, 1-142 2-152 3-149 4-145)
verified wiring to the coils to ensure the correct plug wire orientation.
When looking at data inputs w/a scan tool, all of the values I am seeing appear to be normal.
Any ideas? Have I missed something obvious? I'm considering DME failure as a possibility at this point, nothing else seems to add up.
a faulty air flow meter (IAT was shorted, causing the DME to believe the incoming air was 355 deg. F)
damaged idle control valve wiring, which was repaired
fuel pressure verified at 45psi
timing verified (blocks on cams, pin in flywheel, index mark on balancer lines up w/arrow on oil filter housing)
Two intake leaks were discovered and repaired
A compression test was performed (obviously cold, 1-142 2-152 3-149 4-145)
verified wiring to the coils to ensure the correct plug wire orientation.
When looking at data inputs w/a scan tool, all of the values I am seeing appear to be normal.
Any ideas? Have I missed something obvious? I'm considering DME failure as a possibility at this point, nothing else seems to add up.
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