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revs up and down

Discussion in 'Volkswagen and other VAG' started by S3 chj, Jan 3, 2008.

  1. S3 chj

    S3 chj Member

    Nov 21, 2007
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    hi my old mk3 golf gti 16v keeps reving up and down its goling from 500rpm to 2000rpm any ideas what causes this and how to fix

    cheers chris
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  3. a19hur

    a19hur New Member

    Sep 15, 2008
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    This may be a bit late now but i the same problem with vw polo mk4 16v people call it 'hunting' for revs and i managed to cure it, firstly i removed and cleaned out my throttle body which didnt actually cure it but when fixed it revved smoother, i then reset my ecu memory which i did by disconnecting my battery for a day (may have to hook urs up to diagnostics im not sure) Still not fixed!
    Then i changed my engine coolant temp sensor which was defective and giving wrong signals to my ecu, all sorted for £30 and a little bit of time and effort.
    I found this info on a polo forum and it was process of elimination for the three things i did. Hope your problem is all sorted now, cheers Andy

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