Question about 1999 Chevrolet Lumina

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I have a 99 chevy lumina 3.1 liter . it has a rough idle. service engine soon light comes on i take it to auto zone says egr valve . have that changed along with fuel filter. one week later service engine soon light comes back on take it back to auto zone they check it again code P0401 take it to another machanic who comes up with same code as autozone and says possible the first machanic didn't clean out when he replaces EGR so he cleans it out and still has rough idle. the idle is like when you make the purr sound with you mouth and let you tongue roll and it vibrates . thing is rough idle isn't all the time and when the idle is rough i notice i get horrible gas mileage , and upon dead stop its hard to pick up speed like it just doesn't want ot go or not getting the gas needed . what could the cause be ? please help . idon't know what else to do .

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6ya6ya

6ya staff

  • 2 Answers

SOURCE:

Hi there,
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Posted on Jan 02, 2017

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Anonymous

  • 81 Answers

SOURCE: Service engine code indicates EGR valve.

You could have a restriction in the egr ports. remove the valve. Plug the holes, start engine. 1 hole will be blowing out exhaust, the other will have large vacuum.

Posted on Mar 28, 2009

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hfmiles

Jackie Miles

  • 1165 Answers

SOURCE: ive got a 98 chevy lumina with a p0401 code ive

Did you have the engine scanned, or did you do it yourself? The reason I ask is, the code would need to be cleared after the new egr valve was installed. You would need to do another scan, and then clear the code with the scanner tool. If you tried to clear the light by removing power from the ECM, that would only clear the light from the dash temporarily. The code would still be present in the ECM memory which would cause the light to reappear.

Posted on Mar 09, 2011

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