Question about 2003 Chevrolet Impala

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Noisy rattle in engine compartment of 2003 Impala on cold start.

It doesn't really sound like unlubricated lifters and may not even be internal to the engine itsefl. I can't identify the precise location of the rattle's origin. It goes away when the car is warmed up, so I can never get it to a mechanic soon enough for them to hear the sound.

The noise is not present when starting the car in moderate to warm temperatures. (I.e., above 50 degrees F).

The vehicle has 44,000 actual miles.

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  • SethII Dec 25, 2008

    I did what you advised and still couldn't isolate the noise. It seems to be coming from somewhere out-of-reach of the broom handle, maybe on the underside of the engine or related to the exhaust system. Catalytic convertor?

  • SethII Dec 26, 2008

    I don't think that I was able to reach the oil pan. Everything else sounded normal.

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Take a broom handle(with the broom removed) or long heavy dowel rod , start the engine when cold and place one end of handle to your ear and the other to different parts non-moving parts of the engine compartment,including the engine to narrow down  the location of the noise. 

Posted on Dec 22, 2008

  • Thomas F. Schneider Dec 25, 2008

    If it were the catalic converter it would be farther back and not coming from the engine compartment.


     You placed the wooden rod on both valve covers, Intake manifold and both exhaust valves as well as the engine block on both sides and the oil pan?  

  • Thomas F. Schneider Dec 26, 2008

    Only nine thousand miles a year is far less that the average 15k for the first two and 10 k theirafter. I woudl consider having the engine flushed, or take it on a long drive..I believe your best posibility is still a sticky lifter. the other option is just leave it alone untill uit either goes away or manifestes itself more.

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