1997 Chevy Venture EGR error code

GG1234

MEMBER
1997 CHEVROLET VENTURE
6 CYL
FWD
AUTOMATIC
235,000 MILES

Service Engine Light came on. Got OBD code P0401 (EGR flow insufficient). Had EGR valve replaced, everything else seemed OK. Same code has appeared 3 different times, but only in following circumstances: going down 2 mile steep hill, 3rd gear, speed about 35 mph, not using gas petal, occasional brake use. Otherwise light never comes on. Any suggestions other than a possible defective replacement EGR valve?

1 Reply

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Make sure where the EGR attaches to the manifold is clean. I've see the maniflod carbon up. Also, I need you to check intake manifold vacuum.

Let me know what you find.

Joe

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Monday, December 14th, 2009 AT 7:51 AM