Results 1 to 2 of 2

Thread: AFR goes rich when letting off throttle

  1. #1
    Tuner in Training
    Join Date
    Nov 2010
    Posts
    40

    AFR goes rich when letting off throttle

    Hey guys. What could cause my AFR going very rich (as low as 11.1) when I let off the throttle. The further down the throttle is before I let off, the richer it goes. It goes rich for about 1-2 seconds, then climbs back to normal.
    *

  2. #2
    Tuner in Training
    Join Date
    Nov 2009
    Location
    Newport RI
    Posts
    14
    Transient fueling, i.e. wall film,(effect is just like an accel pump on a carburetor when you hit the throttle - opposite effect when lifting):

    http://www.hptuners.com/forum/showth...ight=wall+film