1995 Chevrolet Lumina Q&A
1995 Chevrolet Lumina Question: Chevy Lumina-Sedan 3.1L, RPM NEEDLE OSCILLATING SLIGHTLY UP AND DOWN, at Idling.
I recently notice that when my GM Chevy Lumina-Sedan LS 3.1L is idling, its RPM guage needle oscillates up and down slightly and not too fast like vibrating. Also, there is a humming noise from the engine compartment. I want to fix this problem before it gets worse. Your advice will be appreciated. - carzen
Does the humming come and go as well and at the same time as the Idle changes? How much RPM variation is there? - ChevyASE