Question about 1999 BMW 323 Series
Is the check engine light on?
this could be a number of different sensors(mass air flow, crankshaft position sensor etc), or even a wet ECU.
I have a 99 M3 (new to 400,000 kms), had to change the ECU twice now. ecu compartment gets wet. Wet circuit boards do lots of different things. If you've checked most of the standard stuff plus, coils, check the ECU box area below the windshield passenger side.
mine started with a replacement windshield, grounded off area never retouched with paint and rusted out, water off the windshield drained into the ecu compartrment and soaked the ECU slightly different results when things got wet,
Posted on Feb 04, 2010
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Posted on Jan 02, 2017
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