Knock noise from behind rear wall

[mistermac99]

Originally Posted by josefer

Have had a 2002 S 3.2. At around 20,000 kms. in odometer subtle knocking noise began at wall behind seats, while particularly going over cobble-paved roads after a 10 or 15 minute warm-up. At times it also looked as coming from doors, or seat belts, or engine, or...

Turned out to be faulty rear suspension trailing arms (parts no. 986-331-143-4 or 043-7). The ball-joint cap looses with time and as grease inside gets hot and thin, ball-joint knocks and transmit noise to the wall where they're attached. More easily reproduced when lifting accelerator pedal, going slow. Can be first at right or left side, but with time problem goes to both.

Lots of chassis hearing tests before finding it. Hope this helps.

I had the same problem, and had my Indy replaced the one on the passenger side. He had a heck of a time determining what it was, but sounds good now, just like it should, no knocking.

Just wondering, what did the replacement arm cost you? I saw them on Pelican for $116.00, but mine was three times that. I guess it's because he ordered a genuine replacement? The number on the arm didn't match the replacement on Pelican.

I also had a manifold leak welded on one side, now it really sounds cool!

[Squozen]

Originally Posted by mistermac99

I had the same problem, and had my Indy replaced the one on the passenger side. He had a heck of a time determining what it was, but sounds good now, just like it should, no knocking.

Just wondering, what did the replacement arm cost you? I saw them on Pelican for $116.00, but mine was three times that. I guess it's because he ordered a genuine replacement? The number on the arm didn't match the replacement on Pelican.

I also had a manifold leak welded on one side, now it really sounds cool!

The $116 part is a front control arm, not a rear, so that's one reason.