» » »

Chevrolet Q&A

Ask Your Question

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

 

Question

catalyst01, 3.1L V6, Watertown, TN, June 17, 2013, 16:32
 Rookie

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.

1 Answer
Flag This
  • Answer #1

    pushrod June 17, 2013, 17:23
    Profile_thumbnail
     Master

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

    Flag This
  • Reply

    ChevyASE, June 20, 2013, 05:33
     Journeyman

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

    Reply
    Flag This