2007 Chevrolet Colorado driviliti problems

BROSVGS

MEMBER
2007 CHEVROLET COLORADO
2.9L
4WD
AUTOMATIC
791,890 MILES

Hi everyone can someone help me with the diagnose rough idle. And code p0300 on 07 chevy Colorado 2.9 engine. I check fuel pressure and = 80psi when running but ones I turn the truck off fuel pressure drops. Hope someone can help me Thank you an advance.

Saturday, September 20th, 2014 AT 8:13 AM

1 Reply

HMAC300

MECHANIC
48,601 POSTS

300 code is random misfire. It can be a bunch of things causing it however you fuel pressure seems tobe a bit high. Pressure shold be 50-57 psi with key on engine off and should hold for 1 minute if not it can be leaking through injectors as well as blockages on return lines.

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Sunday, September 21st, 2014 AT 3:45 PM