Nasty scratching noise, exhaust? -- Update - Fixed!

[White93z34]

recently my car will make this god awful scratching type noise at lower rpms it sounds like an exhaust problem to me, and seems to come from under the center of the car, one of my mufflers is startinfg to crack on the outside and rust through but it don't soound at all like the culpurt, its embarrising haveing the car make this noise, any sugestions?

[Guest Gp crazy]

check the heat sheild it maybe falling apart it's only held in by rivits

[Psych0matt]

or possibly your cat breaking apart inside? Mine sounds like butt because all of the pellets are loose and rattle like none other between 2000-2500 rpm's.

[Intimidatorz34]

or possibly your cat breaking apart inside? Mine sounds like butt because all of the pellets are loose and rattle like none other between 2000-2500 rpm's.

 

Did yours only do it while it was still cold.....if so then thats probably my problem( I thought it was the resonator) but now I am thinking the cat is partially clogged.

[White93z34]

it seems to do it more so when cold but at all temperatures, last owner told me he put a new catalletic converter on it which i verified by looking under the car and i saw a newer cat welded in

[gp90se]

even aftermarket cats fail if the engine is running rich, id pull it and put a pipe on to test. You can either buy another cat ($50 catco on ebay shipped) or leave it without the thing, but before doing that, figure out why ya car killed the cat, start with replacing the o2 sensor.

 

-Jeff

[White93z34]

well i crawled under the car today, started pokeing around at the heatshields and turns out the one on ontop of the cat was all rusty and ratleing, got a screwdriver and some pliers and had it off, no more noise just the warm note of the 3.4.

 

anyone know anything about catco cats? thats what the one heat shield said it was