Rick's Free Auto Repair Advice

Posts Tagged: fuel in the oil

P0172, fuel in oil, Rough idle, engine run-on GM

P0172, fuel in oil, Rough idle, engine run-on GM Diagnose and fix P0172, fuel in oil, Rough idle, engine run-on GM GM has issued a service bulletin #PIP4783B to address P0172, fuel in the oil, Rough idle, engine run-on GM vehicles listed below. Before you perform any diagnostic tests, pull the engine oil dipstick, and check for the presence of fuel. GM has determined that a P0172 System Too Rich (Bank 1) may be caused by a defective high-pressure fuel pump that’s leaking fuel into the crankcase when the plunger … Read More


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