rough idle

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03-25-2009, 04:33 PM

whiteracing

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Join Date: Mar 2009

Posts: 3

rough idle

1995 blazer, 4.3 , 4x4, idles real rough. runs ok on the road. hasnt died yet at idle , but has come close. smells rich , i replaced the computer. still the same ????????????????

03-25-2009, 05:18 PM

swartlkk

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Join Date: May 2005

Location: Waterloo, NY

Posts: 41,151

Test your fuel pressure. Specifically watch it after the pump shuts off.

It is very likely that you have a fuel leak internal to the intake plenum.

03-25-2009, 05:22 PM

whiteracing

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Join Date: Mar 2009

Posts: 3

fuel press. is within rec. factory specs. i was woundering about the E G R valve ?

03-25-2009, 06:10 PM

swartlkk

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Join Date: May 2005

Location: Waterloo, NY

Posts: 41,151

The EGR is another possibility. Remove, clean, and reinstall with a new gasket. Preferably one with a screened inlet.

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