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Rough Idle on 1.8T (AEB) engine

Discussion in 'A4/S4 forum(B5 Chassis)' started by K7ERG, Nov 26, 2007.

  1. K7ERG
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    K7ERG Member

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    [Nov 26, 2007]
    Looking for some pointers on how the idle is up and down on my 1.8T engine. Engine runs fine but at traffic lights/junctions the idle drops and goes up and down. Not had it on Vagcom but will be looking to do so soon.

    Thanks in advance

    Craig
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  3. Biglockie
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    Biglockie Aye you know it makes sense

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    [Nov 26, 2007]
    idle speed control valve? either that or a MAF fault
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  4. HTC
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    HTC Active Member

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    [Nov 26, 2007]
    Check for vacuum leaks.
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  5. Markey
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    Markey Active Member

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    [Nov 26, 2007]
    Could be a split breather hose as well as the above ^^^^

    There is a plastic hose under the intake that is like an L shape that can brake in the middle this was gone on my car and causeing a ruff idle and a bit of hunting.
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  6. K7ERG
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    K7ERG Member

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    [Nov 26, 2007]
    cheers for the replies
    at the moment no EM light flashing up.
    MPG i am getting around 300 to 330mile to a full tank to about 20mile left on range. Is this about right for a standard car.????

    Craig
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  7. Markey
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    Markey Active Member

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    [Nov 26, 2007]
    Yeah thats good i get about that and somtimes i once got 360:) that was with a dead turbo as well.

    Have a look at the hoses and that one under the inlet mani and then try and get VAGCOM hooked up.
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  8. K7ERG
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    K7ERG Member

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    [Nov 26, 2007]
    cool so not to far out with the MPG.

    Is there any point in changing the inlet manifold to the same as found on the Seat, VW. ( the one with the Throttle body at the end instead of the one like the URS4 AAN engine)

    Oh and the gearing is longer than i thought with 18" wheels in 3rd 105mph before limiter.......

    Craig
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