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Wrangler Gets Gas In The Oil
Q. I have a 1989 Jeep Wrangler 2.5 liter engine with 140,000 miles on it, 30,000 with the rebuilt engine. I have two problems, the first is that I am getting gas into the oil. I have an electric fuel pump in the gas tank so I don't think that is it, could it be either the fuel injector, the TBI, or the fuel pressure regulator, or what???
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Also, my oil pressure is about 65 psi when idle and past 80 psi when in gear (manual transmission). I am pretty sure it is the pressure relief valve, but I just wanted to make sure that the pressure relief valve was in the oil pump and not in the engine block I have three different auto repair books for the Wrangler but I could not find the answer in any of them
Thank You,
Patricia
A. At low speed (600 rpm) oil pressure should be 13 psi. At 1600 rpm and higher it should be 37-75 psi. Oil pressure relief kicks in at 75 psi. The oil pressure relief valve is in the oil pump itself.
As for the gas in the oil, that's a tough one. With mechanical fuel pumps it's possible to pump gas into the oil, but you have an electric pump in the gas tank so there is no connection between engine oil and fuel.
The only thing that might do it is if the fuel pressure is adjusted too high. That TBI has an adjustable fuel pressure regulator so it may be adjusted too high.
Put a fuel pressure gauge on the system. If the fuel pressure reading is high, turn the pressure adjusting screw outward to decrease the fuel pressure to the correct range. If the fuel pressure remains too high after attempting adjustment, check the fuel return line, and tank fittings for obstructions. Clear any obstructions found and retest. If no obstructions are found the fuel pressure regulator is defective and must be replaced.
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