Question about 2004 Pontiac Bonneville
More than likely the gages are not the problem and are just responding to faulty sending units on the engine and the in the fuel tank, gage problems are not selective, that is to say that if there is a problem with the gages it will be all the gages not just one or two of them.
The fuel level gage problem will require you drop the fuel tank down out of the car and replace the fuel gage sending unit, to do this you must raise the car up and support it on safety jack stands, disconnect the fuel tank filler pipe and remove the 2 bolts that retain the steel straps that hold the fuel tank into the undercarriage (support the tank with a floor jack at this point) of the car, at home an assistant is almost mandatory, once the straps are off drop the tank down and reach onto the top of the fuel tank and disconnect the electrical connector to the tank and the fuel lines (pressure line, fuel return and vapor lines), a special fuel line release tool is required to remove the outlet and inlet fuel lines to the tank (availiable from Napa auto parts and others), once you have it down remove the ring that holds the sending unit into the fuel tank and remove the fuel tank module that contains the fuel gage sending unit, reverse to put back together.
Now on to the oil pressure gage issue, if the problem is that the gage shows low pressure or no pressure before you do anyhting have the oil pressure of the engine tested, the sender is located on both engines near the oil filter (of course once again the car must be jacked up to access the sending unit for oil pressure gage), remove the sending unit and hook up a oil pressure test gage, the pressure should be at least 55- 60 PSI at 1500 RPM, if it is ok replace the oil pressure sending unit
Posted on Nov 09, 2010
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Posted on Jan 02, 2017
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