Question about 1991 Saturn SC
Hi! Two things to look at to pass the emissions test. First, the ECM (engine control module) must be replaced for this controls the air and fuel mixture of the car. If the ECM is faulty you will fail the emissions test. Second will be the MAF (mass air flow) sensor. If the MAF is faulty you'll experiece an erratic idling, no wonder you have high rpms. You will need to replace the MAF. Hope this helps and thank you for using FixYa!
Posted on Sep 10, 2010
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Posted on Jan 02, 2017
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