My check engine light is on and once it's cleared it keeps coming back on "running rich".

Asked by Cdkwalms Jan 08, 2014 at 10:36 PM about the 2009 GMC Sierra 1500 SLE 4WD

Question type: Maintenance & Repair

I have a 2009 gmc sierra that is
"running rich". The last few times I
started it, it's been having trouble
starting up and twice it's stalled out
and I had to restart it. Took it to a
local shop and they cleared the light
after they said it was running rich.
Why does it keep coming on?

2 Answers
2,480

justaguywithatruck answered 10 years ago

I changed all my sensors on my 89 gmc when i was having ther same problem. Nothing fixed. Took to my mechanic and they did a pressure test. Leaking intake valve gasket. Replaced, cleaned everything and its running like a champ and no longer running rich.

Mark helpful
70

johnreasterling answered 6 years ago

what are the codes,when you say its running rich do you mean that you see black smoke coming from exhaust,spitting sputtering,strong fuel smell a little more info would be helpfull most of the larger partstores will scan the codes for no charge

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