JONES199

When I first start the car, put the car in gear (tip) and begin to pull away there is a “rattle” from the rear. Only last through 1st and second and is absent on all subsequent shifts. I have checked the engine compartment and deck lids for loose items and found nothing. It doesn’t sound like valves (it rattles rather than clicks) … the closest thing I can compare it to was the sould made by a rotten leaf shroud on a 77 nova I had a kid. I am assuming it's exhaust realted as once the car gets just a little warm the sound stops. Any ideas?

Andy Roe

Check for loose heat sheilds on the exhaust. It's quite common for them to work loose.

JAMES J

What year is the p-car? Could be the catalytic converter!

JONES199

It's a 91 c2

JAMES J

My converter rattle's when cold....stop's when warm. Will have to replace soon.

JAMES J

Indy....your kidding.....you can have it !.....should I ask what for...? It will be a while before the change... JJ

JAMES J

ALOHA INDY......Done Deal....10/4........Jim

Andy Roe

All 964's have a CAT. It was the 1st car Porsche made that was universally compliant.

Marc Shaw

Rattle could also be a loose dust/water shield on the inside of the brake rotor.

Marc

PC2

I had similar rattles coming from loose heat shields surrounding the CAT. I was able to eliminate the rattles by retightening the bolts.

JONES199

Tightened the bolts on cat shroud, they were quite loose, it seems to have fixed the problem.
Thanks to All