1998 Chevy Lumina EGR codes

1998 CHEVROLET LUMINA
121,000 MILES • 6 CYL • FWD • AUTOMATIC
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SPARXX02
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I have 1998 chevy lumina my check engine light is on it faluting every EGR code there is even after I replaced the EGR value. The car starts up great but only has power at low acceleration. When hard acceleration its doggy has no power.
Apr 12, 2010 at 6:39 PM
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JALOPYPAPA
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Usually an EGR malfunction is not in the valve itself, which as you've seen is just a vacuum diaphram and pintle. Most often, it's restriction of flow caused by the gunk that forms naturally in the intake manifold clogging up the EGR passage within it. If your codes include PO401, insufficient EGR flow, I would definitely look into that. Examine the intake port where the EGR bolts on and make sure you can pass a soft wire through the passage or passages. May require removing the intake for cleaning in severe cases. Secondarily, most EGRs use a sensor or rely on a computer signal to monitor engine backpressure and adjust the EGR operation accordingly, and that mechanism may fail.
Apr 15, 2010 at 5:45 PM