Question about 2004 Buick Rainier

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When my 2004 Ranier is idling sometimes I hear a 'thud'

When vmy 2004 Ranier is idling sometimes I hear a 'thud' sound; what's the cause of this? I've also noticed that my back end appears lower than usual sometimes but when I start the ignition, it levels off and resumes it regular height.

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The climate control system does that. They have a new hose for the AC compressor that fixes the issue. Chris

Posted on Oct 25, 2009

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Possibly 2 conditions at once. If it is sitting at an idle and you hear the thud noise, it very well depends on where you are hearing it but it almost sounds to me like maybe occasionally the is backfiring.I would personally if this is the case, Take air filter housing away from the motor and check the throttle body for a buildup,check air filter, and try some fuel treatment.If you have no check engine light it is not mis firing, but it could be exhaust related.

Posted on Oct 10, 2009

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