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1998 Chevrolet Lumina Question: why does car idle get worse when we replace MAS?



catalyst01, 3.1L V6, Watertown, TN, June 17, 2013, 19:32

Code showed MAS was bad, replaced with used part. Light went out, but car would barely run - it would rev high upon startup, then rev dropped and it would sputter and die/almost die. It just kept doing that in a cycle. When we unplugged sensor, the car runs much better, however check engine light is then on.

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  • Answer #1

    June 17, 2013, 20:23

    Check the big rubber intake tube to be sure it is not damaged and installed/tightened correctly. - Try a new MAF sensor!

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    ChevyASE, June 20, 2013, 08:33

    I agree with pushrod. Sounds like you have a HUGE unmetered air leak.

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