Thanks for the nice welcome. I am an old shadetree mech. that loves to work on my cars. But the 1997 Pont. Bonn. SSEi I have has got me stumped. I took it to a real mechanic friend of mine and he took the Serpentine off and found that I had an ever so slight movement in the front pulley or bearing of the SC. Also said that there may be an issue with the A/C comp. clutch making noise both engaged and not engaged.
Of course he wanted me to pay $1800 for a rebuilt SC right off the bat!!!! I am not sure he is my "friend" anymore.
Any help is appreciated!!!!

Oh, I forgot to tell you all that the main problem is a load rattle coming from the engine, especially when I start it up.

Welcome to the site!

The problem is that I get a load rattle noise from the engine especially when it'* a cold start. The noise is reduced after the engine is warmed up. Boost seems to work as well as ever. I am just scratchin' my head in Salt Lake City!

Thanks! Just trying to get the hang of the site! And get some help with my problem.

Welcome! I'm sure you'll get some answers to your questions soon.

You have a bad coupler. It'* not a bad job if you have the tools and are fairly handy with tools. Order a ZZP coupler and some SC oil and have at it. There are numerous videos out there on changing the M90 coupler.

that is if the noise is coming from the snout of the SC.also welcome to the forum post a thread with your issue in the proper section and we will get you all fixed up

Welcome to the site. Just post up in the right area and we will get you all taken care of.

Welcome to the Forum!!