So if I drive my 99 SC400 for more than 15 minutes it will ping really bad when i turn off the car. I tracked the noise down to the exhaust. It sounds like it's coming from the drivers side Cat or maybe heat-shield.

I know metal has to cool down and what not, but this is pretty loud IMO. I just changed all the fluids, spark plugs since I just bought the car last week.

BTW... The car runs and drives great and does not make this noise while the engine is on. Thank You.

Any ideas...Thanks

 

It's totally normal.

 

Yup^ it is completely normal. That big boy v8 puttin all that heat on the shields they can't take it lol

 

that is the sound of metal contracting (one bolted part sliding against another most likely, which is why it pops as pressure builds up and relieves) after its heat load has been removed.

if you want to reduce this noise, get rid of your cats, they get very hot and from what you're describing could be the source of that noise for you. or get some high flow cats, that might help too.

 

I wish your search button pinged like crazy because in ten years we have at least 50 threads on this. Try harder next time The info is there.

 

Hahaha...made my morning!