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Self Revving?

Discussion in 'A3/S3 Forum (8L Chassis)' started by shaneg, May 13, 2010.

  1. shaneg
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    shaneg New Member

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    [May 13, 2010]
    Occasionally (1 in 5 stops roughly), whilest sitting at, say traffic lights, my a3 will rev itself between its idle point and about 1.5k revs up and down until I pull away.

    Engine management light is on.

    Unfortunately I have not had a chance to get it diagnosed yet due to a busy work schedule but I would like to know what you guys think the problem maybe and a rough cost if at all possible!

    Thank you
    #1
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  3. JD09
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    JD09 I'm not modding, I'm improving VCDS Map User

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    [May 13, 2010]
    Would suggest it'll be difficult to diagnose without running VAGCOM, that'd be the best bet.
    #2
  4. DaveA3
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    DaveA3 Audi A-Trizzle!

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    [May 13, 2010]
    mine did this a lil bit. Turns out the throttle body just needed cleaning. get some carb cleaner and spray it in and give it a few revs. i took mine out to clean tho as it was easier to get all the **** out

    :thumbsup:
    #3
  5. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [May 13, 2010]
    Sounds like a vacuum leak and a big one if its caused the CEL to come on as at a guess the idle trim will be maxed out...

    VAGCOM and block 032 will say for sure...

    Have a look at hoses coming off the bottom of the inlet mani in particular the PCV ones as I would imagine you have a big split in that...

    <tuffty/>
    #4
  6. Westy
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    Westy Double Dark Side! Diesel & 8P

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    [May 13, 2010]
    Also could be the clutch sensor. You'll need to get it on VCDS/Vagcom
    #5
  7. shaneg
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    shaneg New Member

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    [May 13, 2010]
    Thanks for the replies people, Will take a look tonight when I get home from work at the mentioned causes, if no joy will get it on diagnostics asap
    #6

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