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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)
Hi John,
The hesitation until 1/4 warm has me ('83 320i) stumped too. I will watch for the advice of others. I do not have your other problems.
Check for vaccum leaks. Don't overlook the drip stick and the oil filler cap.
Have you looked at the distributor advance system. Also check for distributor shaft wobble.
I will watch with interest.
Nello
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