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bouncing idle

Discussion in 'A3/S3 Forum (8L Chassis)' started by Andy91, Aug 8, 2013.

  1. Andy91
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    Andy91 New Member

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    [Aug 8, 2013]
    hi I have a 2001 a3 AUM

    the cars idle is fluctuating slightly and is beginning to really annoy me, I have changed the vac pipes under the inlet for n249 n112 ect as the t piece had snapped and cant seem to find any other vac leaks I have cleaned the throttle body and changed the plugs & today checked for fault codes on vcds-light and there were none, but when changing the plugs I did find some oil on the coils?
    any help would be great! thanks in advanced
    #1
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  3. bree9482
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    bree9482 Member

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    [Aug 8, 2013]
    Hi mate, l am in exactly the same scenario :crying:

    I have VCDS lite also, but it wont let us get to the blocks that we need to get to !!

    I have changed all the things that have helped other people, but the problem still remains. If you get an answer pls share lol.
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  4. CMcKenzie
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    CMcKenzie It's supposed to do that..

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    [Aug 8, 2013]
    Instead of starting a new thread I'll post it here as it's related I think..

    I came out of the shop and it's not idling properly. If you don't give it any revs, it flutters and dies. Give it a few revs and it idles a bit lumpy but then settles. Recently fitted a new genuine Bosch MAF, scanned it and not showing any codes.
    Is this similar to yours?
    https://www.facebook.com/photo.php?v=10151588987066347

    -Callum.
    #3
  5. bree9482
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    bree9482 Member

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    [Aug 8, 2013]
    Here is mine dude !!

    My erratic idle - YouTube

    Mine does not die but cant get this idle resolved !!

    I have changed MAF(Bosch), CTS, Breather Hose, Injector Cleaner No codes and its driving me nuts !!
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  6. CMcKenzie
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    CMcKenzie It's supposed to do that..

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    [Aug 8, 2013]
    I think your problem is because of splits in the pipework somewhere, or perhaps the inlet mani gasket? It's getting unmetered air, so fluctuating a little.
    Don't quote me on that though, I'm sure someone with lot more knowledge than me will be able to shed some light on it
    -Callum.
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  7. bree9482
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    bree9482 Member

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    [Aug 8, 2013]
    Thats a good shout mate !! I have been looking for leaks everywhere using easy start spray. Trying to get the engine to rev a little when it draws in the spray. cant find someone to smoke test and cant find the damn leak !!!
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  8. CMcKenzie
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    CMcKenzie It's supposed to do that..

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    [Aug 8, 2013]
    I had a hissing noise coming from my engine, squirted a bit of carb cleaner around the gasket on the inlet mani and you could hear the revs rise.
    Worth a look I guess.
    -Callum.
    Last edited: Aug 8, 2013
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  9. bree9482
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    bree9482 Member

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    [Aug 8, 2013]
    Cheers mate !! Im goin grey trying to sort this out lol But hey fitted the S2K air filter tonight and it sounds awesome !!! :)
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  10. CMcKenzie
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    CMcKenzie It's supposed to do that..

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    [Aug 8, 2013]
    Haha, I fitted one a couple of weeks back, just because I was bored and it was fairly cheap. I think messing around with my old MAF when I was fitting it killed it though, as I had to then buy a new one.
    -Callum.
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  11. bree9482
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    bree9482 Member

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    [Aug 8, 2013]
    Thats sucks mate !! I learned tonight that l suck at cutting silicone hose lol I butchered the MAF end as the reducer i had was too long and god dam the 80-70mm reducer is wrong !! it more like 86-70. I nearly punched myself in the balls several times trying to squeeze that hose on !!
    #10

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