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Anyone with a 90hp AHU engined car? I need help with vacuum pipe locations.

Discussion in 'A4/S4 forum(B5 Chassis)' started by mtaylor55, Oct 26, 2012.

  1. mtaylor55
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    mtaylor55 New Member

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    [Oct 26, 2012]
    I've just rebuilt my friends 2000 w plate 1.9 TDi. It's the AHU engined 90bhp version. There are vacuum pipes at the bulkhead, and I can't figure out where on of the goes. Can anybody help? I know one of the goes to the egr, and another to the air filer housing, but there is another not attached to anything which I can't figure out. The turbo isn't cutting in, and I hope the 2 are related.
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  3. Bradderz_1988
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    Bradderz_1988 Dont replace it, Upgrade it !!

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    [Oct 26, 2012]
    Vnt on the turbo or the turbo pressure electrovalve ???
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  4. Greeny233
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    Greeny233 Active Member

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    [Oct 27, 2012]
    There is a vacuum valve mounted on the underside of the hard plastic turbo pipe which runs around the back of the engine, it should run to that. Should sort the boost issues, my old B5 1.9 AHU had a boost problem and it was this valve which was the problem.
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