Question about Pontiac Sunfire

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I have a 1998 Pontiac Sunfire 2.2 L, and it has a terrible knocking noise, I do most of my car work myself, so I took off the head cover and checked all of the rods, they are all in good condition, none bent and so forth. My oil Light is almost constantly on, but Any time i check my oil level, it is always full! I cant for the life of me figure out what is wrong, could someone help me please? help?

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You should have run the engine with the rocker cover off to make sure it is pumping oil up top. Not sure what you have for a oil light, pressure light, or analog gauge, showing pressure in pounds, but either way, it has nothing to do with oil level, that is what the dipstick is for, the gauge just shows pressure and it will read 65 lbs with one qt oil in it. I would think that if the light came on, you lost pressure no matter how full it is. You may have a rod knocking in there becasue of the lack of oil to it. To get to the pump, you need to remove the pan, which is close to impossible, the engine has to come up and the cross members removed. Still no guarentee you can get to it, If a rod is bad, you will need the pan off for that too. Only trouble is, you can't pull the piston out the bottom with the crank in the way, it has to come out the top after being unbolted. You are kind of in a pickle there, If it isn't a rod or a piston , wrist pin, con rod, it could be the belt tensioner, but that would have nothing to do with the oil light, everything else would. Hope this helps.

Posted on Oct 05, 2010

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First you have to locate the source of the noise. Use a long screw drive putting the hold on your ear and the tip on the different engine spots. A needle stethoscope can do the job better. If the noise is coming from the bottom of engine, and amplified during acceleration, then you may have a crank shaft problem, this is bad news and need engine rebuild. The overhead cam noise is a tick. Might be a collapsed lifter or more. Hope this will help.

Posted on Oct 05, 2010

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