1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Revs under braking at low speed

Discussion in 'Engine & Drivetrain' started by Big English, May 18, 2020.

  1. BG1988

    BG1988 Full Access Member

    Posts:
    1,713
    Likes Received:
    676
    Joined:
    Nov 14, 2018
    Name:
    Brent
    MAF mine would randomly do this tell i replaced it

    sometimes it would even FULL throttle while idling or HIGH idle at 2500-3k rpm random... check the G/S (MAF "g/s") and IAT

    the IAT should be with in 2 degrees of the outside temp..

    MAF is the most common problem of the GMT800/900 series
     
    Last edited: May 29, 2020
  2. Big English

    Big English TYF Newbie

    Posts:
    25
    Likes Received:
    13
    Joined:
    Apr 1, 2017
    Name:
    Adam
    Thanks for the input everyone, was happening for a few days then another code came up saying cylinder 8 was mis firing. Had that in the shop and replaced the coil pack. All seems to be running good again. Weird that 7&8 went within 2 weeks of each other.
     
    wjburken likes this.

Share This Page