mcafaz

I have an exhaust rattle that is driving me nuts!! I cant find it anywhere. It only does it when the car is hot and when im on the gas it sounds like there is a large chunk of metal rattling around or in the exhaust, when i check it for rattles and shak the whole thing down from header to tailpipe, i get nothing that could ever sound like that. Could this be a catalytic converter going bad. Please help, im lost

945LSTANG

i had that problem...check to make sure that your exhaust hangers arent rubbing on the fuel tank.

mattdel

might not be an exhaust rattle... might be detonation

Blckstng93

Just from your description id have to agree with possible detonation. Check your plugs. healthy plugs will have a tannish-brown insulator with very little electrode wear.

If you have broken or cracked insulators then you have detonation which can ruin your pistons. Make sure your plugs are the right heat range.

Go grab a Haynes manual. Theres a great color chart for plugs inside the back cover.

94StinkinLincoln

if you rev it up then let off its going to make that rattle.

Blckstng93

No idea if this is a stickie but here it is anyway.

WhiteWindsor

I had that rattling problem in my sold 91 hatch. Damn thing ran me crazy. I was under the car several times and could not find it. When i rebuilt my rear end i checked again and it was an 02 sensor that was loose. I could not believe it could make that much noise but i tightened it up and no more rattle.

dagmando

Check right tailpipe at the top of the hump where it goes over the axle. It is right up near the brake line and drove me nuts until I finnaly had it up on a lift.

mcafaz

i appreciate all of the input. today i was driving with the ac on and it seemed way warse which seems to me like it would be closer related to the motor, plus, it almost sounded like it was vibrating very fast under hard accelaration and seemed like it gained power when it happened, not sure what to think of it but was wondering if it could be detonationm would that cause the car to seem to have more power while it is detonation is occuring, i appreciate any input anyone can provide

AdderMk2

just keep driving it... the rattle will stop eventually..

like when you melt a piston from being a dumbass