Annoying metallic rattle from rear

[ninsei]

Hi. On a 2000 C2, i have been trying to track down this annoying metallic like rattle from the rear. It happens whenever I accelerate or decelerate. not sure if it's coming from inside the cabin or not. It sounds like it may be coming from the drivers side (U. S. spec car) rear. i checked the muffler bolts on that side and the metal plates above the relay panel on that side already.

[drateam]

About your rattle. I have a 02 C4S; second owner. The previous owner didn't exactly fess up to it, but his service records show he was trying to deal with what sounds like the same rattle. Nothing found by the dealership. I inheirited the same rattle, and spend weeks trying to trace it; seatbelt mechanisms, window seals, and many other false leads. To make a long story short, an independent took it as a challenge to track it down (he was pissed off that it couldn't identify it immediately and went on a crusade). He finally found it: a bad weld on the panels at the very back of the car; driver's side, near the rear light assembly. A quick spot weld, and no noise at all; it's been a year. He checked other welds and came away even more angry -- his opinion: really shoddy welding wherever he looked. So, might not be a bad idea to check; I'm holding my breath for new weld-related noises, but after a year nothing (yet). Hope this helps

[ninsei]

About your rattle. I have a 02 C4S; second owner. The previous owner didn't exactly fess up to it, but his service records show he was trying to deal with what sounds like the same rattle. Nothing found by the dealership. I inheirited the same rattle, and spend weeks trying to trace it; seatbelt mechanisms, window seals, and many other false leads. To make a long story short, an independent took it as a challenge to track it down (he was pissed off that it couldn't identify it immediately and went on a crusade). He finally found it: a bad weld on the panels at the very back of the car; driver's side, near the rear light assembly. A quick spot weld, and no noise at all; it's been a year. He checked other welds and came away even more angry -- his opinion: really shoddy welding wherever he looked. So, might not be a bad idea to check; I'm holding my breath for new weld-related noises, but after a year nothing (yet). Hope this helps

hi, thanks. so, would this bad weld spot be visible from under the car? would i have to remove anything to get to it?

[bmohr]

could be your engine tin is loose on that side.

[ninsei]

could be your engine tin is loose on that side.

Hi. What/where is the engine tin?

[drateam]

About your rattle. I have a 02 C4S; second owner. The previous owner didn't exactly fess up to it, but his service records show he was trying to deal with what sounds like the same rattle. Nothing found by the dealership. I inheirited the same rattle, and spend weeks trying to trace it; seatbelt mechanisms, window seals, and many other false leads. To make a long story short, an independent took it as a challenge to track it down (he was pissed off that it couldn't identify it immediately and went on a crusade). He finally found it: a bad weld on the panels at the very back of the car; driver's side, near the rear light assembly. A quick spot weld, and no noise at all; it's been a year. He checked other welds and came away even more angry -- his opinion: really shoddy welding wherever he looked. So, might not be a bad idea to check; I'm holding my breath for new weld-related noises, but after a year nothing (yet). Hope this helps

hi, thanks. so, would this bad weld spot be visible from under the car? would i have to remove anything to get to it?

The tech had to remove all internal panels and facings from the rear interior. Worth checking out (in my case, I thought for sure it was the engine tin, but wasn't).

[demosan]

Hi. On a 2000 C2, i have been trying to track down this annoying metallic like rattle from the rear. It happens whenever I accelerate or decelerate. not sure if it's coming from inside the cabin or not. It sounds like it may be coming from the drivers side (U. S. spec car) rear. i checked the muffler bolts on that side and the metal plates above the relay panel on that side already.

Not sure how many miles you have on your car, but is not uncommon that the baffles in either the catalytic converter or the muffle break loose inside and cause some noise that is hard to diagnose. YOu could remove the muffler first and see if there is something loose inside as well as the catalytic converters.

If you do a search for noisy catalytic converters in this forum I'm sure you will see some info.

Good Luck!! Demosan :cheers: