Question about Chevrolet Impala

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  • alain_ch May 05, 2009

    corvette85 check engine light open intermittent code 42 lean exaust

  • marmob81 May 20, 2009

    I have the same issue and have replaced the EGR valve. Do you have to clean anything in the intake or should replacing the EGR valve do the trick?

  • Anonymous Mar 15, 2014

    check engine light on and it reads egr valve. But don't know where to find it on my car.



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The EGR valve helps your car more efficiently and completely burn fuel by recirculating a portion of your exhaust and running it through the combustion process again. This results in a cooler, more complete burn of the fuel which decreases you car's noxious emissions by prohibiting the formation of some harmful gases.

The EGR valve is vital to your car's emission controls.

When the EGR valve goes bad, it must be replaced - it cannot be repaired.

  • EGR Valve = Exhaust Gas Recirculation Valve.
  • The EGR valve controls formation of noxious emissions.
  • Rough idle and poor acceleration can be caused by a faulty EGR valve.

  • The EGR valve, or Exhaust Gas Recirculation valve, is a vacuum controlled valve which allows a specific amount of your exhaust back into the intake manifold. This exhaust mixes with the intake air and actually cools the combustion process. Cooler is always better inside your engine. The exhaust your EGR valve recirculates also prevents the formation of Nitrogen related gases. These are referred to as NOX emissions, and are a common cause for failing emissions testing. Unfortunately, your EGR valve can get stuck, causing NOX gases to build up. You'll know if your EGR valve is stuck or malfunctioning because your car will experience symptoms like rough idle and bucking on accelertaion.

    The only short term problem is a decrease in gas mileage - but it should really be replaced before sensors become sooted or your cat. convertor gets overworked prematurely.

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    Posted on Apr 15, 2009

    • fxhamby Oct 25, 2010

      What if you have replace the EGR valve and still have a light, what should you do?


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    Posted on Jan 15, 2013

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    Take the negative battery cable loose for about an hour (30 min may be enough as recommended but I did it for an hour), after replacing the EGR valve. This clears all codes in the computer. Put a thin layer of high temperature silicone gasket sealer on it. Be extremely careful removing the inside bolt to the eGR valve so as not to drop it in the motor as I did. (The symptoms on my 2001 Impala was a jerking as if turning the switch on and off quickly).

    Posted on Mar 31, 2012

    • buddsea
      buddsea Mar 31, 2012

      Take the negative battery cable loose for about an hour (30 min may be enough as recommended but I did it for an hour), after replacing the EGR valve. This clears all codes in the computer. Put a thin layer of high temperature silicone gasket sealer on the gasket. Be extremely careful removing the inside nut to the EGR valve so as not to drop it in the motor. (The symptoms on my 2001 Impala was a jerking as if turning the switch on and off quickly). It did it mostly going up a grade at about 50 to 55 mph but sometimes at other speeds. Make sure the ports are cleaned out first.


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    I have a 2003 Chevy Impala that is giving me problems. It's sputtering when idling and slowing down, has stalled a couple times at a traffic light. Sometimes has a knocking sound, when in reverse the...

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    Nov 28, 2009 | 2000 Chevrolet Impala

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