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advise please

ebbs73 Jun 28, 2006

  1. ebbs73

    ebbs73 Member

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    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
     
  2. jdp1962

    jdp1962 Grumpy Old Moderator Staff Member Moderator Team V6 TFSI Owners Group Gold Supporter Team Tornado quattro Black Edition Audi S4 s tronic

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    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.
     
  3. ebbs73

    ebbs73 Member

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    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
     
  4. jdp1962

    jdp1962 Grumpy Old Moderator Staff Member Moderator Team V6 TFSI Owners Group Gold Supporter Team Tornado quattro Black Edition Audi S4 s tronic

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    Yes, on second thoughts, based on your second post, I'd have to agree with CMS. Sorry, I misunderstood what you were describing.
     
  5. ebbs73

    ebbs73 Member

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    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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