Hi, My GT has recently developed a rattling noise while driving on rough surfaces, I at first thought it was a loose lug nut on a tire, checked that, then though it was the divider between the trunk and the rear seats. still no, am now thinking it could be either at the muffle is loose, or the shocks need to be worked on. The Tib is still factory and is has around 89k on the odometer.
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1st i would make sure that it is indeed the calipers and not the stabilizer bar end links.the links should not make any noise if pulled on.there will be movement ,as they have ball joints in them but there should not be a clacking sound if you pull on the links. .Irritating suspension faults can also be found by hitting parts with a 2 lb rubber mallet. Also check the pad clips are in place or the pads could be rattling in the caliper.Worn slider pins can be replaced along with the bushing inserts..
look for loose rubbers on shockies, suspension points sway bar points , front and rear , check for loose muffler rubbers or faulty cat converter rattling inside , check for loose rocks under the heat shielding around the exhaust system.
you have over heated the engine and the noise may be from ring failure . It may be from detonation from the fuel detonation from an extremely hot chamber. Have a compression test done to determine internal damage _--gasket and cracked head--. Have the coolant system pressure tested to check for leakage
A common cause for the "rattling" noise you've described is a loose heat shield for the catalytic converter. Many times, a weld will break loose leaving you with a hanging heat shield that vibrates and "rattles" while you drive. A trip to the muffler shop should be able to confirm this. By itself, a loose heat shield is not something major.
Another cause could be a loose exhaust hanger that holds the exhaust firmly in place. It too would tend to rattle more as you drive. Either way, it would appear on the surface that your issue is exhaust related. Best of luck and thank you for using Fixya! Greg
not likely possibly the cover for torque converter may be loose. if rattling coming from pass. side may be belt tensioner/or water pump. to check shut engine off remove serp. belt check water pump pulley for play by wiggling back an forth do same with belt tensioner. check trans fluid level while on level surface engine warm&running tranny in park. some gm cars have had problems with crank shaft pulleys making rattling noise also.
I had the same problem! I crawled underneath the car and discovered that a heat shield on the exhaust header pipe was corroded and rattling against the exhaust pipe. (Before the muffler) I removed the portion and clamps and solved the problem. Give it a try.