1986 fanger 2.3 before and after rebuilt gets gas in oil get 5 mpg why?
3 Answers
A few things to check: with the engine off, remove the vacuum line on the fuel pressure regulator and see if there's raw fuel in the vacuum line. You can cycle the key on for a couple of seconds but don't try to start it. Raw fuel = blown fuel pressure regulator. Change the regulator and the oil. Check for a blocked or pinched fuel return hose. Do a compression check. Rings can cause a concern like this too - excessive blow-by. Are there any codes in the computer? A MAP sensor failure can cause the system to go full rich and dump a lot of fuel too. AIT and ECT sensors will also force a system rich.
we rebuilt engine it still has gas in oil get 5 mpg haven't checked fuel return thanks
I covered all the issues I can think of that could cause bad mileage and cylinder wash-down providing that the engine was assembled correctly and the valve timing is right. 5 mpg is incredibly low. Unheard of for a 4 cylinder. Driving a vehicle in this condition will burn out a Catalytic Converter, cause the exhaust manifold to glow red and overheat the engine. Of course, when you change the oil after 500 to 7500 miles is will smell a little like gasoline - that's normal because there is no such thing as a perfect seal from the rings.
