2007 Chevrolet Colorado driviliti problems

2007 CHEVROLET COLORADO
791,890 MILES • 2.9L • 4WD • AUTOMATIC
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BROSVGS
  • MEMBER
  • 7 POSTS
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.
Sep 20, 2014 at 8:13 AM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
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.
Sep 21, 2014 at 3:45 PM
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