JMB RetrofitsEM Tuning
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  1. #1
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    Why is my rpm jumpy

    Jumpy rpm needle audi a3 8p - YouTube
    Tried cleaning the throttle body, maf sensor, changing the spark plugs, cleaning the engine. But the problem stil occurs. Any idea on this guys? Possibly a vacuum leak? If so, where is the first thing I should look?

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  3. #2
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    MrLapou's Avatar
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    With a warm engine, try removing the oil filler cap while car idles to see if that makes a difference. In a normal engine, it'll make revs fall and rise.

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    Quote Originally Posted by MrLapou View Post
    With a warm engine, try removing the oil filler cap while car idles to see if that makes a difference. In a normal engine, it'll make revs fall and rise.
    Warm engine, coolant at 90 degrees. Removed the oil cap, no noticable differnce. Engine shaking just slighrly but not that much when removed. Tried with the dipstick, no signs of difference

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    MrLapou's Avatar
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    Ok. then it points to a vacuum leak.

    Do you have access to VCDS or a blue tooth OBD2 dongle plus Android phone running Torque?
    Thay way vacuum can be monitored.

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    Quote Originally Posted by MrLapou View Post
    Ok. then it points to a vacuum leak.

    Do you have access to VCDS or a blue tooth OBD2 dongle plus Android phone running Torque?
    Thay way vacuum can be monitored.
    I have a CAN obd2, i can diagnos a car but cant write. What parameter should i look at mate?

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    Sorry, but need to bring this thread to life, as i am still having the problem.
    Well i now have access to vcds. I assume i am going to engine 01 > then?
    I also tried removing the pcv valve from the engine block itself. I then started the engine. Rpm raises about 2000rpm then back to 777 RPM then back to 2k RPM. Needle was still jumpy when that was removed. Any more ideas?
    I only have a NOX sensor fault in vcds. But that might not be the problem?

  9. #8
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    Engine is also "choking" in idle. After driving the car an hour or two. Here is a video of ot choking
    http://youtu.be/4iWFxE1AnVk

    When its choking. It does this every 30-ish second...

  10. #9
    wuta3's Avatar
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    Holy thread revival. Sounds like PCV failure if its a lumpy idle with hunting revs.
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  11. #10
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    Quote Originally Posted by wuta3 View Post
    Holy thread revival. Sounds like PCV failure if its a lumpy idle with hunting revs.
    What i thought too. I dont think it is the pcv. Removing it will not remove the jumpy needle issue. But after researching, the EGR (exhaust gas recirculation) unite might need to be cleaned. The EGR is located right beside/behind the throttle body. It contains gears that maybe broke (cheap plastic gear) or just clogged up. Will check on this tomorrow or sunday. They say that it is a simple process looking at this. Will give feedback on this!

  12. #11
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    Here is the egr valve btw

  13. #12
    RedDejavu's Avatar
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    check the DV mate for any splits
    Be patient. English is tough.

    Now:

    61 Audi S3 BE S-Tronic Ibis White: Build Thread.
    / Black Edition pack (SatNav, Bluetooth) / Parking Sensors / Tinted windows / piano inlays and finish / Cruise Control / Interior light pack /
    /Mods: REVO Stage 2+: Revo Intake / BCS Powervalve TBE system / LOBA HPFP / Crystal Clear H11 FOGS / Black roof + spoiler vinyl wrap / H&R Anti-roll bars / Superpro ALK /


  14. #13
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    Why is my rpm jumpy

    Quote Originally Posted by RedDejavu View Post
    check the DV mate for any splits
    You mean the diverter right? Dont have it, as my engine is N/A
    Last edited by HenrikMeister; 7th June 2014 at 11:37. Reason: wrong info

  15. #14
    RedDejavu's Avatar
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    ahh ok you didnt state what engine it is
    Be patient. English is tough.

    Now:

    61 Audi S3 BE S-Tronic Ibis White: Build Thread.
    / Black Edition pack (SatNav, Bluetooth) / Parking Sensors / Tinted windows / piano inlays and finish / Cruise Control / Interior light pack /
    /Mods: REVO Stage 2+: Revo Intake / BCS Powervalve TBE system / LOBA HPFP / Crystal Clear H11 FOGS / Black roof + spoiler vinyl wrap / H&R Anti-roll bars / Superpro ALK /


  16. #15
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    Quote Originally Posted by RedDejavu View Post
    ahh ok you didnt state what engine it is
    Upps, my mistake then!

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    Update: removing just the connector didnt make any change

  18. #17
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    Why is my rpm jumpy

    Update 2: removed the top lid on the egr. Lots of dirt, cleaned it. No change.
    Tried removing the 4 T-30 screws. But ended up with stripping the torx bit in half. No more updates.
    Last edited by HenrikMeister; 7th June 2014 at 22:25. Reason: info

 

 

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