My 2000 Firebird 3.8 v6 has an awful squealing sound at the back drivers side of engine. I have replaced the serptine belt, all pulleys, waterpump, alternator, tentioner, a/c and idler pulley. I also had the transmission serviced and still make the noise. Does it at 1500 rpm in reverse, driving, and idle. Please help, tired of spending unnecessary money.

Hi try this on the belt..cheers

Pulleys also wear.
You've changed the belts - a workshop would then change that particular pulley, if asked to do so.

Start your engine, then put a few drops of water onto that pulley. Does the squealing noise disappear? If so, the pulley is slightly worn in the groove - and this happens to all vehicles.

Your option is to either replace that pulley or use a spray-on anti squeal compound.

Generic images below:
belt anti squeal Google Search

I'd guess it's the water pump.

Check belt , tensioner and pulleys for squealing and definitely replace fuel filter

Replace the crank pulley before it costs you an arm and a leg. It has caused this problem. don-ohio

Yes that is very likely it. Since you changed the belt, you should know - Is it the tensioner pulley ? Otherwise it is probably the water pump. The problem is the bearings.. If the bearings are locking up, the resistance will shred the belt quickly.. the part needs to be replaced is the bearings. Waterpump bearings are built in to pump. Change whole thing. (may need to transfer the pulley)

the waterpump on this car is turned by the timing belt, when you replace the waterpump on this car the timing belt should be replaced no doubt about it, the timing belt must be replaced and also the pulleys checked and if the car have 100,000 miles or more the timing belt pulleys must be replaced. the reason for this is that if for any reason the belt jumps or breakes then engine damage will occur, the pistons will bend the valves and this is very costly, there is no extra labor to do the belt it has to be removed to do the waterpump you would just pay for the parts, for example to do a waterpump it would run about $400.00, then to do it right with a waterpump timing belt and pulleys it would run 500.00,i think its a wise thing to do.this car only uses one pulley that needs replacing so i said pulleys but rather just a pulley that runs in this belt design. good day, heres a few diagrams to help explain how it works.

Every 50,000 miles or every 4 years, whichever comes first.

2002 Ford Windstar 3.8 223000kms engine squeal or chirp with serptine belt removed.

You didn't mention the alternator, power steering pump, or water pump. In fact, any pulley other than the crankshaft one can have a bad bearing or dry seal. Remove the belt and spin each pulley while listening for any rough noise or squeal. If it was the crankshaft, it might be time to check the oil. Start the engine with the belt off to see if it does squeal. Make sure the noise isn't coming from the radiator fan(s).