Rattle trap!
#1
Rattle trap!
Hey everyone, my wife has a 99 blazer 4dr. 4x4 with 135k on the clock.My problem is every time the compressor cycles, the exaust rattles bad. I crawlled under and it sounds like its comming from the cat. My question is could something in the cat break loose and rattle? Thanks for any help.
#2
Absolutely. The honeycomb of metals in the cat can burn out and break up causing a rattle. If the cat is not replaced, the pieces can move to the muffler and plug it, also. A plugged exhaust will have a negative impact on performance.
#3
also, u may want to go under there with a rubber mallet and just tap the cat a few times to see if u can duplicate the sound. Also bang the floorboards a few times and see if u can locate the rattle, U might find that the problem is something like a rusted out heat shield. Im not sure how many heat shields are under there, as ive never paid too much attention to them, but i know for sure that there is a big one running down the side of the gas tank.
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