Question about 2001 Pontiac Grand Prix

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Knocking in motor when it is in park, goes away as soon as you put it in gear. thought it was the tranny at first but it will go into gear and move now. 2003 Pontiac Grand Prix 3.1L Automatic

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Just because it moves doesnt mean it is not the trany, you will need to pin point the noise, a common problem is the crankshaft pulley, this sound it makes when the pulley goes bad sounds like a bad motor or trany. check this by removing the belt, locate the belt tensioner and pull to release the tension off the belt. make a diagram of how the blet goes on the pulleys so you can reinstall it correctly. after you remove the belt grab the crank pulley and see if it moves, if it turns back and fourth a little, like 2 inch each way then the pulley is bad, also check the rest of the pulleys by spinning them and checking for a noise. with the belt off start the engine and see if the noise is still there, with out the belt there should be little or no noise then this would mean the pulley is the problem but if the noise is the same then move on to the engine, you will need to listen closely, it may be a bad engine bearing or even a flywheel, this noise may be hard for you to find, even a tech would take time to find out the noise, i think you should stop at a shop to have them listen to it just so you dont mis diagnose the noise, this may be many things and if its somthing you are not sure of then a shop should listen to it, its hard to tell you whats wrong without me hearing this noise. good luck and good day.

Posted on Mar 27, 2011

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