Join Date: Sep 2005
Location: Mississauga-Toronto, Ontario
Excessive Catalytic cooling down sound
I dunno if this is common but every time i stop my engine, summer or winter it makes this horrible metal shrinking sound. Like when a car cools down, but it sounds like someone is hitting it with little hex nuts or something. ITs coming from the twin catalytic converters for sure. I dont remember doing it this loud, its really quiet for like 1 min then it starts. it never does it with the engine running, its just when i turn it off, almost instantlu sometimes.
Ill have to get it on tape once, its annoying as hell. Maybe im doing something wrong? Running the wrong headlight bulb perhaps ??? LOL j/k.
Any advice or support from past experience would help. I just dont want to be ignoring a problem, hopefully im just obsessing over something insignificant. My buddy's 1500 sierra sounds like its being hit with a hammer LOL...