2002 GMC Yukon code p0300

2002 GMC YUKON
185,000 MILES • 6.0L • V8 • 4WD • AUTOMATIC
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D107
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I've replaced mas air flow, egr valve, fuel filter, injectors, plugs and plug wires, crank shift sensor. Fuel pressure is running around 50psi have good spark. But still throwing a code p0300. What else could it be?
Jun 18, 2014 at 4:18 AM
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HMAC300
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  • 48,601 POSTS
these are very hard to diagnose even for a pro best to have them do it if your vin is "Z" then it shold be 48-54 psi all others 55-62 so if it's not a vin z sounds like fulepump doesn't have enough pressure. although it could be something like a compression problem valve train problem.
Jun 18, 2014 at 6:12 AM