Have you checked the idler pulley? Sounds like that may be your problem
Said "knock" could be in the AC compressor or power steering unit since it don't knock with belt off.
SOURCE: 1995 galant broken balance shaft belt
You sould replace the belt along with the timing belt. If it gets caught in the timing belt you will have MAJOR EGINE DAMAGE!
SOURCE: i have a 1990 buick regal 3800 V-6 when engine
explain rattling noise. you can take off the fan belts. start engine briefly to see if engine stil makes noise. that will tell you if its engine or the acc.
SOURCE: knocking noise coming from belt area. when belt
Had the same issue and it turned out to be the balancer. Not too difficult to fix any questions or advice, I am happy to help you. Justlet me know. Good luck
SOURCE: replacing power steering pump in a 95 buick regal
i think you need to remove pully first it is a special puller gm has
SOURCE: 1996 buick regal knocking noise
The intake may be leaking coolant into the crankcase. This can cause the lifter to bleed down also.
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