Running rich at idle

pvtcook · 02-06-2008, 05:30 PM

99 Tahoe 5.7. No check engine light. Started running rough at idle (only at idle) Looking in the mirror I can see black smoke coming from exhaust. What could this be?
Thanks

j cAT · 02-07-2008, 05:05 PM

Quote:

Originally Posted by pvtcook

99 Tahoe 5.7. No check engine light. Started running rough at idle (only at idle) Looking in the mirror I can see black smoke coming from exhaust. What could this be?
Thanks

a bad injector is very possible remove plugs see if all or just one cyl.

2000CAYukon · 02-08-2008, 12:20 AM

A leaking fuel pressure regulator or high fuel pressure can also be the problem.

//2000CAYukon

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