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The idle of my 89 740 GLE (16v, Bosch) is so bad now it doesn't even try to run.
Symptom: I turn the key to pos. II. Fuel pump runs for ~2sec. Turn to "Start". Engine starts on the first crank, every time. I release the starter. engine revs to ~1600-1800. Settles down to ~700. Seems to try to increace RPMs, tach drops and engine dies. Whole sequence takes about eight sec.
Done: Cleaned TB and passages, used old gasket, guessed the torque (snug plus a little). Cleaned IAC (twice!) with carb cleaner and air gun. cleaned IAC hoses and fittings. Checked Air Filter: pristine. New spark plugs: NGK perfect gap.
Thoughts: I wish I could find one of those old school mechs. The kind that sits outside thier "service stations" and listen to the cars driving by: "That one got a misfire, #2 I'd say." or "If that was my car I would retard the timing so much." One of these guys could at least tell me what I'm looking for. It seems no matter how it gets there, an engine either gets what it needs or doesn't and I don't have the experience to tell what mine isn't getting (or getting too much of).
Next step: I'm going to do the OBDI self diagnostic procedure from the FAQ to check some of the sensors.
Any ideas?
Aubrey
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