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

Quick VCDS Injection Quantity Deviation Question

SDHA4SLine Oct 19, 2015

  1. SDHA4SLine

    SDHA4SLine Well-Known Member

    2,613
    525
    113
    Had a fellow member plug in vcds to do a little investigation on my car. We noticed that values between injector 1 & 4 look like they're compensating for one another. I dont know what sort of values should be ringing alarm bells and what are normal so... are these values anything to worry about or are they perfectly fine?

    Thanks
    Steve
    Capture.PNG
     
  2. Avatar

    snack-media
    Advertisement


  3. carlcall

    carlcall Well-Known Member VCDS Map User

    2,230
    1,057
    113
    Sorry Steve I can't answer this for you but was that from cold or warm and I may plug my VCDS in later to see what my values are.
     
  4. I'm Just Rob.

    I'm Just Rob. Moderating or something, Staff Member Moderator Gold Supporter VCDS Map User

    14,547
    6,810
    113
    Errrrrrrrrrr... thats not good steve, looks like a vist to the garage again and flashing the plastic again.





    No only joking steve, cant say i can help you either , but, i'm sure an expert will be along very soon..... probably just a minor tweek needed.
     
  5. I'm Just Rob.

    I'm Just Rob. Moderating or something, Staff Member Moderator Gold Supporter VCDS Map User

    14,547
    6,810
    113
    or this may help you steve.

    The deviation is the correction that the ECU makes to maintain smooth idle. SO if the correction is too big that points to the injectors having troubles. The first thing I would do is to run a Diesel Purge through and try to clean things up. If that shows no improvement, then it's time to think about having the injectors rebuilt.
     
  6. I'm Just Rob.

    I'm Just Rob. Moderating or something, Staff Member Moderator Gold Supporter VCDS Map User

    14,547
    6,810
    113
    found this too.

    Normal. Only start worrying when they go past -/+ 1.2 once warm.

    Big deviations can point to bad camshaft, bad lifters, bad valves, bad compression or bad injector(s)

     
    gary_a4_quattro and SDHA4SLine like this.
  7. I'm Just Rob.

    I'm Just Rob. Moderating or something, Staff Member Moderator Gold Supporter VCDS Map User

    14,547
    6,810
    113
  8. SDHA4SLine

    SDHA4SLine Well-Known Member

    2,613
    525
    113
    cheers rob, looks like im good then, well in on the tolerance
     
  9. I'm Just Rob.

    I'm Just Rob. Moderating or something, Staff Member Moderator Gold Supporter VCDS Map User

    14,547
    6,810
    113
    your welcome chap, and have a good day now.
     
  10. desertstorm

    desertstorm Moderator Staff Member Moderator VCDS Map User

    7,267
    3,610
    113
    As already said those reading are actually very good. If you total them up they should come to close to zero.
    Most cars I have seen tend to be more in the 0.3 to 0.6 region which is still fine.
     
    IceHanger likes this.
  11. guyzza75

    guyzza75 Member

    67
    18
    8
    My b7 2.0tdi BLB was showing number 3 cylinder out and had bad idling. It turned out to be the injector lash needed sorting. Runs smooth now ..the clearance between the injector and the rocker was too much..
     

Share This Page

Do Not Sell My Personal Information