Noisy Rear End

[BoxsterRS]

I own a 98 Box and just replaced the engine mount, serpentine belt, spark plugs and brakes. Before I did all of this I had this anoyinh little noise coming from the back everytime I went through rough roads, speed bump, or hole(small ones). I highly doubt its the rear control arm, when I turn it makes no noise at all, its not spead dependant and I can hear it everyt ime I go through something rough as I mentioned before. This weekend I'll jack the car from the end, remove the rear wheels and tap the suspension with a rubber mallet. Any suggestions as to what is happening? Also, my dad decided to replace the battery once the oem was dead with one from pep boys or autozone. The thing is that in the morning or cold starts(I live in P.R. so its not cold at all) the car hessitates to start. Probably after the second or third try the car starts normal. The firs one the car starts but like if it was drowned(thats how it sounds) and shuts off. Afterwards it runs normal. I also changed the engine oil. I'm not using the car until I can fix the problems. Hope someone can help. I have the Bentley Manual and am a sort of new sort of experienced mechanic.

[BoxsterRS]

I als owant to add that I cleane dthe throttle body

[Chris_in_NH]

the rattling noise is probably the cat heat shields. the bolts that hold them in place rust out. just replace the bolts and you should be fine.

i'm not sure what is happening with your starting problems. it could be the ignition switch (which is a common problem) and a new one can be had for about $20USD.

[Stefan]

It's probably the rear control arm, which has nothing to do with speed or turning. And it's a common problem.

See here: http://www.renntech.org/forums/index.php?showtopic=11823

[BoxsterRS]

It does sound like its coming from the exhaust

[Stefan]

If it's the heat shields on the exhaust, you can usually hear it when you bang on the exhaust pipes with a rubber mallet. (Car stopped, engine off)

[jsmithdmd]

I had a noise too and decided to replace the rear upper control arms (track arms). No more noise. You can do it yourself in about an hour but it's expensive so you might wanna be sure first.