It could be the harmonic balancer. This is the first pulley on the engine drive shaft that drives all the other pulleys with the serpentine belt. It is quite easy to look at it and see if the rubber has deteriorated. I had this problem with my '92 PA.
your cv boot has torn and needs replacement
== == I do believe if you hear a knocking noise that your crank shaft could be failing. Which means you will need a new engine. Have it checked out. Replace the harmonic balancer they will make a bad knocking noise. When you start it and the oil light goes out and it knocks, this is what is wrong with it.
A bad harmonic balancer can cause a knocking noise. The harmonic balancer doesn't actually produce the noise, but it can cause the noise in the engine.
it's probably a rod knocking
many many things, Loose lug nuts which lets wheel make knocking noise. Engine will make a knocking noise if it is really low on oil. Some timing belts make a knocking, slapping noise just before they break.These are just a few examples . Have someone ride in car with you as you duplcate the noise and see if they can determine which part of the vehicle it is coming from.
Having a bad rod bearing could cause a truck to make a loud knocking noise and shake when driving at high speeds. The engine having a coolant leak or an engine timing problem could also cause the knocking noise.
A knocking/clicking noise when making a turn is a sign of a torn CV boot. In this case it's the driver side boot that is torn.
if its a low knocking noise it is normal on the 3.1 engine!! if it is loud check to make sure the valves are getting oil!! I have a 2000 Malibu v6 and it is the same way.
wierd
I would say you either have a rod knocking or lifter knocking. I know in the 3.8 litre motors they are known to knock alittle when you cold start them. Most Grand Ams, Grand Prixs are like this. My sister has a 2002 Grand Am that does this and the noise goes away once it's warmed up. I would also double check and make sure your oil is full. get your car to a garage for a def solution.
Compressor is unbalanced as the rpm's drop.
The knocking that you are describing reminds me of a stuck universal joint. A bent axle usually wears tires out very fast more than making noise.