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advise please

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by ebbs73, Jun 28, 2006.

  1. ebbs73
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    ebbs73 Member

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    [Jun 28, 2006]
    my brother has a a4 130 , it has multitronic ,
    his problem , when he`s in cruise control the revs seem to go up and down ,
    hard to explain

    just wonder if this was normal .

    thanks
    chris
    #1
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  3. jdp1962
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    jdp1962 Grumpy Old Moderator Staff Member Moderator

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    [Jun 28, 2006]
    That sounds like it's working as it's meant to. I have a petrol V6 with Multitronic & cruise control, and it does the same. Remember that the ECU links the engine, gearbox and cruise control together. They all talk to each other. If you're cruising at a steady speed & hit a hill, the cruise tells the ECU to to create more power to maintain the speed. As Multitronic is a CVT gearbox. this is achieved by a slight lowering of the gear ratio to generate some extra torque, hence the increase in revs. Once the hill flattens out, the Multitronic increases the gear ratio again & the revs fall.
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  4. ebbs73
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    ebbs73 Member

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    [Jun 29, 2006]
    it does this all the time and kind of blips every 4-5 secs,
    even when it`s not in cruise control and just at a steady speed , only when your on the throttle . ?

    chris
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  5. jdp1962
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    jdp1962 Grumpy Old Moderator Staff Member Moderator

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    [Jun 29, 2006]
    Yes, on second thoughts, based on your second post, I'd have to agree with CMS. Sorry, I misunderstood what you were describing.
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  6. ebbs73
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    ebbs73 Member

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    [Jun 30, 2006]
    it`s been hard to explain has i have not been in the car , he`s been telling me over the phone .
    i` will advise him of your thoughts.
    thank you
    chris
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