Question about 1994 GMC Suburban

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Just got 1994 suburban with the 5.7L engine. It has 125k on the motor. I noticed it very sluggish and couldn't get out of it's own way. Now I hear a very loud knocking when it idles. Can anyone help me?

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  • kdelectric20 Sep 17, 2010

    Thank you. I kind of thought that.


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Is knocking coming from the engine or transmission? does the knocking get louder when go faster? any lights on the dash on? what color smoke out exhaust? any wierd smells?

Posted on Sep 15, 2010

  • kdelectric20 Sep 17, 2010

    The knocking sounds like it's inside the engine. No lights on dash and no color in exhaust. When first starting up, oil pressure is right around 40. When engine is warmed up, it drops down to right above 0.

  • Daniel Berry Sep 17, 2010

    you have a bad oil pump and need to replace it its not lubricating the motor causing knocking noise


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