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Check alternator decoupler, thats new name for mechanical pulley. Pull serpentine belt and check if alternator pulley is a one way clutch. Should freewheel in opposite direction smoothly and lock up in drive direction. If it doesnt lock up in about 1-2mm of rotation, its bad and will cause a random squeak, usually at idle and when getting off the gas at any rpm.
try some belt dressing if that does not fix the problem then you will need to get another belt take it back to o riely and get a new belt or your money back then go to the other parts store and purchase another belt. Remember you get what you pay for. there might be other problems like the altenator or tensioners or a/c compressor might be draging
First question, it sounds to me like your altenator. If you hear a squeak coming from under the hood, it could be your altenator. If you do not hear a squeak, that does not mean it is 100% not your altenator. There is still a good chance that your altenator is not producing a good enough of a charge to your battery.
and your second question sounds like a problem i had with a 1997 pontiac grand am. I personally think that you need a tune up. I would be sure to get platinum spark plugs, and use sythetic oils to keep your car running strong... good luck
It could be the wishbones, the springs or the inside panels rubbing which is also very common. Also, some shocks have plastic shields on them that tend to squeak
If it's not the belts, it might be your alternator. I had the same problem. I would have the belts tightened, then the problem would come back a few months later. Ended up that the alternator was bad. Replaced alternator, battery and belts and it hasn't happened since.
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