defcon(ls)1

iTrader: (1)

I'm considering buying a 1998 T/A automatic with low miles. It rattles/buzzes underneath when backing up slowly after the motor is warmed up (idle is lower when warm). After reviewing some threads here I found the following possibilities:

1.) Broken catalyst internals
2.) Loose exhaust pipe hanger
3.) Exhaust heat shield (maybe not as it's not that tinny sounding)
4.) Cracked exhaust weld
5.) Rear springs rattling on the spring perch

What else could it be? I am suggesting the dealer take a look at it too.

_JB_

iTrader: (33)

My heatsheild under the catback was rattling at warm idle. When it makes the noise, where is it coming from?

defcon(ls)1

iTrader: (1)

Somwhere under the car I haven't dipped my head down to look quite yet. But your response is helpful. Thanks.

98Camarod

iTrader: (43)

Could be the guts of the muffler also. Look to see if there are any dents in it.

TheBlurLS1

iTrader: (8)

Best thing is to have a friend listen or drive the car while you listen. Might not find it at all lol. They don't call these cars "Rattle-Traps" for nothing...

defcon(ls)1

iTrader: (1)

Thanks much.

zach_ws6

iTrader: (3)

hell, you're gonna put full exhaust on it after you get it anyway right...you'll fix it then

Blown2000SS

trans mount or heat shield