Question about 1997 Chevrolet Lumina

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I have a 97 chevy lumina ls car. i am getting the code po401. i have brainstormed around the egr area, but haven't solved it yet. what do you think the problem is?

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Could be a dirty EGR pintle passage area.
This is a common problem where carbon builds up and causes a code to trip.

A DTC trouble code P0401 which is insufficient EGR (exhaust gas recirculation) flow.

Posted on Oct 09, 2010

  • 1 more comment 
  • mike Oct 09, 2010

    so how do i clean it, or whatever i need to do to get rid of the carbon? what should i use?

  • Duane Wong
    Duane Wong Oct 09, 2010

    Remove the egr valve and get a new gasket for it, Use carburetor cleaner and scrape the inside of the space where the black carbon is, until it is removed satisfactorily.

    There could be blockages further down into the manifold, but usually it blocks up near the egr valve.

    Hopefully, this will rectify the situation with the code.

  • Duane Wong
    Duane Wong Oct 09, 2010

    Reassemble the egr valve to the engine with the new gasket, and you're done.
    May need special wrenches to remove the egr valve that are angled correctly to get at the bolts.



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