Question about Chevrolet Monte Carlo

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Check eng lt came on after 54.6 miles of driving , changed cat converter, and p0420 code pop up

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  • 33allstar Oct 14, 2010

    i change cat , egr valve ,plugs ,wires purge valve, map sensor

  • 33allstar Oct 14, 2010

    thank you

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You may have a central port injector thats on its way out. This can also be caused by plugged cat, plugged egr, or a misfire.

Posted on Oct 14, 2010

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basically replace the cat converters as they are blocking the exhaust system and preventing your over 45mph problem
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1 Answer

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