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2004 Impala issues

My sister in law is having a horrible time with her 2004 Impala. It doesn't accelerate well and it is idled pretty high. She has had the Spark plugs and wires replaced as well as the fuel pump and filter and the problem has not gotten better. My brother thinks it may be that her cat is clogged. Any suggestions?

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Yes, cat clogged is the most likely cause. It is a known issue/defect for these cars. The dealer may fix it for free, as it is a known problem, and there may be an extended warranty for that particular failure. (10 years, 100K miles I think it is). Go to a dealer and ask them about it.

Posted on Jun 12, 2009

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Take it to a muffler shop and have them test the cat. they should test it for free.

Posted on Mar 25, 2009

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SOURCE: Accleleration issues

It's very possible the cat is plugged, only way to tell is to drill a small hole in the exhaust right before the cat. I the exhaust is LOUD coming out of the hole when you start it up, it means there is alot of pressure building up in front of the convertor, and plugged. with the cat plugged the car will run like ****, jerky, no acceleration, etc. try to run the car down the road at 50 MPH and just BARELY touch the gas, if it seems ok, press on the gas, if the cat is plugged it will ****.

Posted on Oct 28, 2009

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Usually plugged fuel filters and/or bad pumps cause loss of power at the high end (full throttle) when you are sucking down the fuel not so much at the low end.

Rough idles can be a lot of things, usually something to do with the fuel mixture or timings. Dirty injectors, distributor problems, streatched out timing chain/belts... those are a few common rough idle issues.

Has the fuel economy gone down? Does it still have good acceleration?


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Probably the ignition timing is not advancing the spark on acceleration or high rpm's.

That is the job of the ECM (Electronic Control Module). Check it / Replace it.

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