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In Reply to: Diagnosis for ailing patient posted by John on February 06, 2000 at 11:45:07:
: Looking for some tech advice for a persistent problem with an 83 320is. Any ideas appreciated! I recently changed the head gasket including new head bolts, cold start injector, airflow meter etc and I'm still having running problems.
: Symptoms:
: 1. Cold start - engine revs to 2000 and then drops to 900 after 30 seconds.
: 2. If you step on the gas is backfires into the intake manifold.
: 3. If you drive before the engine is 1/4 warm, at around 2200 rpm it will buck and miss, but at 3000 rpm it has loads of pull and no miss.
: 4. After the engine reaches 1/4 warm mark on Temp gauge the backfires and hesitation disappears.
: 5. However, when warm I only get a reading of 15lbs vacuum at 900 rpm which seems low.
: Any ideas? timing?warm-up regulator
: Thanks in advance (no pun intended)
Check the fuel pump relay. Mine had the same symptoms after the head rebuild. I finally replaced the the relay and it fixed everything.
Chris
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