In Reply to: NEED HELP: 535i check engine light posted by Rod in Toronto on January 06, 2000 at 23:14:32:
: Hi hopefully someone here can help me out.
: My 92 535i 5spd has approx 140,000 miles. It has been exhibiting the following symptoms, all of which I believe may be related:
: 1. Rough idle, not surging but simply rough...like a car with bad or wet spark plug wires.
: 2. Intermittent stumbling under moderate acceleration.
: 3. Immediately after hitting a moderate bump (ouch) the engine "hiccups" or "bucks" for a split second and then resumes as normal.
: 4. Near the end of a recent 4 hour drive on cruise at about 75mph, the engine began to stumble and the cruise shut itself off.
: 5. Immediately following this, the check engine light came on briefly for about 30 seconds twice. Then stayed off for the next hour.
: 6. The following morning the car started, but was idling wildly erratically, despite attempting to keep the car at about 2000 rpm. The check engine light came on.
: 7. After about 2-3 minutes of this, the engine seemed to operate normally.
: 8. On the return trip, the engine performed fairly well with a little stumbling under acceleration as evidenced earlier. The check engine light did not come on again.
: Any thoughts?
: Rod in Toronto
: 84 318
: 92 535
Fuel pump comes to mind. You should do the stomp test to get the fault code. That should lead you in one direction or another. It sounds like there might not be adequate fuel pressure.
Another thing that comes to mind concerning #3 above. If your car has ASC traction control, there is a known problem with the ASC computer causing a quick 'miss' after immediately travelling over a bump. This is detailed in a TSB, but I don't have a copy and I don't have the number. If this is truly the cause of #3, I don't think it is related to the other 'happenings' you have been experiencing.
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