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Motor runs rough and loud at start up

Discussion in 'General Chevy & GM Tech Questions' started by mjmar4978, Dec 6, 2008.

  1. mjmar4978

    mjmar4978 New Member

    when starting, engine sounds loud and vibrates for about 10 seconds, than settles down. i have a 2003 trailblazer with 82,000 miles
  2. raisor87

    raisor87 New Member

    are your rpms high then level out or is it just making noise?
  3. retired

    retired New Member

    Could just be the clutch fan?
  4. project86

    project86 New Member

    I know of someone that had a similar problem. Turned out to be the harmonic balancer

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