Question about Chevrolet Cavalier

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Car Revs up & down until it gets warmed up (intermittently)

Sometimes I start my car she runs fine, sometimes I start her she revs up & down like it's shifting up & down until it warms up. Once it warms up speedometer works & it stops reving. Anyone know what it could be? Side note - why is the speedometer working intermittently as well? Once everything warms up it works fine.

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  • Bobbie Codi Sep 06, 2012

    Ck'd vacuum lines - replaced one - still does it. Replaced fuel injectors a while ago, so don't think that's the issue. Idle Valve good. All suggestions below are quite old - any fresh ideas?



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  • 120 Answers

Cold idle control sensor bad

Posted on Sep 06, 2012


6 Suggested Answers


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  • 2 Answers


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Posted on Jan 02, 2017



  • 625 Answers

SOURCE: revs boucing

try to add some lucas aditive to it, if does not solve the problem then your reverse might be about to brake, but this lucas aditive try to add with a transmission tune up at same time

Posted on Jun 19, 2008


steven martin

  • 117 Answers

SOURCE: Intermittne revs when car starts until it warms up.

Sounds like you have an air leak from one of the vacuum lines. Does the engine idle normally when at normal running temperature?

Posted on Apr 07, 2009


  • 1 Answer

SOURCE: 2000 sonata GLS 6 Cyl. Start the car and it stalls.

Check your idle control valve...

Posted on May 14, 2009


  • 318 Answers

SOURCE: Toyota Camry revs up to 3kms when started

Sounds pretty normal to me.

Posted on Sep 25, 2009


  • 97 Answers

SOURCE: Rpms jump up and down until car warms up

crank position senser

Posted on Feb 11, 2010

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But possibilities are to be inspected to confirm what exactly it is.------

To troubleshoot and confirm the issue,i suggest you refer few solved help links with similar types of problem like yours:------

Click the link below:------

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