1997 BMW M3 Repair Question
Idling low...mass air flow error
If it isn't the actual MAF, (Mass Air Flow), sensor, it can be checked at certain engine speeds for certain voltages within set parameters, then I would be looking for vacuum leaks around the inlet manifold and associated plumbing/fittings. If it is the MAF, I have had great success rates, (over 80%), from simply cleaning the Sensor plate/wire with White Spirit, (100% hydrocarbon), and a careful compressed air delivery in the same direction as engine airflow.
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