Are these the parts I need (from Advance'* website)? There'* several "idler pulleys" on their site for my car.

"Factory Air Idler Pulley - grooved" #45971


"Factory Air Idler Pulley - smooth" #45979

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Nothing to add of help but I had a 93 Park Avenue Ultra and I had a similar noise. I thought those pulleys were the problem with mine so I bought them but it didn't fix it. That'* when I realized it was my SC. One thing I noticed with mine was it would get quite if I pushed on the gas pedal and raised the rpms a little. I didn't have the know how as to rebuilt it and I only paid 1500 dollars for the car. So I drove it, I put 30K on it and it still ran when I sold it a year later.

How do you know it was the SC? Because what you just described sounds like a harmonic balancer. Except the sound that a bad HB makes is more of a rattle. But when you give it a little gas to raise the rpms to about 2,000, it will get quiet as you stated.

My noise is definitely not the SC. There is no play on the pulley.

SC coupler = rattle at idle, goes away as rpm'* increase.
HB = CLATTER at idle. Also goes away as rpm'* increase.

Pete, want to troubleshoot? Remove those two pulleys. Oil the races on both sides (soaking overnight may allow it to penetrate past the dust shields). Grease the bolt. Grease the inside face of each bearing and the spacer. Reassemble.

Did it help? How did the bearings 'feel' when you had them off the car? If this helps, buy the new pulleys and replace them when it starts making noise again.

Have you isolated it to one specific belt path yet? If so, don't replace just one. Do both pulleys on that path. Have you considered swapping idler pulleys from one spot to another? The pulleys on the tensioners are identical to the smooth pulley on that double idler.

I already replaced it. That was another noise I had at first. That thing was expensive to. My friend works at the dealer as the parts manager and I think it still cost my somewhere around $100.00. At the same time I replace the harmonic balancer I had to replace the motor mount near the drivers side front on the engine. So I had that noise as well as a clunk everywhere I went. Talk about feeling embarrassed at the drive through

Drive thru? I powerbraked my car to keep the RPM'* up at traffic lights and in drive-thru'* for the couple days I had a HB on each car before replacement.

Thanks Bill. On removing the pulleys....are they reverse threaded?

I have not run the car with only one of the belts. I will go ahead and oil them to see if it helps.

Let'* not start on noisy driving...I'm currently driving with one LOUD, but possibly two failing wheel bearings, a whiney idle and accleration that turns heads (probably due to these pulleys) and a clunky rearend because my shocks are shot!