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Registered
Join Date: Sep 2006
Posts: 3
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Ignition coil and idle\stall problem
1989 535iA - M30 Engine
Been beating my head over an idle that runs fine (700 rpm) then suddenly will drop a few hundred rpm and at that point either stall completely or surge to 1100-1200 rpm before dropping back to 700 rpm. Have inspected all the usaul suspects. Could a bad ignition coil cause that sort of problem? Thanks Jim |
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09-07-2006, 08:59 PM
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Living on borrowed time!
Join Date: Dec 2003
Location: Tacoma, WA, USA
Posts: 7,020
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air leak?
if it settles down when warm, I say air elak.
__________________
Better a has-been than a wanna-be 'I am John Andrew Moffett of the Clan Moffat and by god I live, love, seek, fail, grieve and die as I so choose and I call no man master save me'. |
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09-08-2006, 01:20 PM
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Registered
Join Date: Sep 2006
Posts: 3
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Have looked for vacuum leaks - don't see any. TPS & ECT & CPS & AFM all check out. Have changed ICV and distributor and rotor. I'm at a loss.
Oxygen sensor ihas only 18000 miles on it. Beginning to suspect fuel problem, but tired of throwing parts and money at the problem. Help! |
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09-08-2006, 06:10 PM
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Living on borrowed time!
Join Date: Dec 2003
Location: Tacoma, WA, USA
Posts: 7,020
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'looked for vacuum leaks'
did you try the propane (or contact cleaner) test; run engine, spray cleaner or propane around the usual suspect points, listen for idle to change.
__________________
Better a has-been than a wanna-be 'I am John Andrew Moffett of the Clan Moffat and by god I live, love, seek, fail, grieve and die as I so choose and I call no man master save me'. |
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09-15-2006, 03:29 PM
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Registered
Join Date: Sep 2006
Posts: 3
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Idle Problem Fixed
It turns out the problem was a bad pulse generator/cylinder ID sensor: see #9. This is sometime included with new plug wires but check to make sure it is. They should be changed together at a regular interval, say 50,000 to 100,000 miles.
The car drives like a dream now 
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10-19-2006, 03:57 AM
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