Engine or exhaust rattle

[Mjlong]

Hi,

I have a 2000 boxster s. I've noticed that there is a slight rattle coming from the engine or exhaust area when the car is idling. I've been told that it's the cats but have also been told it's the clutch on the alternator. Has anyone come across this problem with the alternator before ? Thanks, Matt

[logray]

I get a little clutch noise too, which is perfectly normal for a manual.

I've heard that mufflers and cats can sometimes produce a rattling noise. It could be loose hardware holding them on, or you could remove them and shake them around in your hands to see if the same noise is there.

If you want to elminate any of the accessory pulleys (such as alternator, water pump, etc) and the noise is constant.

On a cold engine, it is safe to remove the accessory belt (serpentine belt) and run the car for 10 or 20 seconds.

If the noise happens all the time but when you removed the belt you don't hear them anymore then your problem is with a pulley bearing, shaft, etc.

Sometimes it helps to get under the car with it running and put your ear near things (wear safety glasses/gloves).

Sometimes it helps to post a brief video of the noise to help others aid diagnosis.

[jsm]

Sounds to me its more straightforward. I think one of the heat shields on the exhaust is loose. Its free to fix If its loose and the likely cause as is often the cause of rattles.

Just needs tightening or replacing if its broken but is only a £20 part if its the latter.

Edited August 29, 2011 by jsm

[pk2]

Sounds to me its more straightforward. I think one of the heat shields on the exhaust is loose. Its free to fix If its loose and the likely cause as is often the cause of rattles.

Just needs tightening or replacing if its broken but is only a £20 part if its the latter.

How the 'ell could you hear anything at all with those bypass Pipes JSM? (grin)

PK

[jsm]

Pk, your right its loud. Factory fit tequipment sports exhaust.

I take it your in the states, you got them there?

[Mjlong]

Hi, just to let you know that I had the clutch replaced on the alternator and it has solved the problem. Thanks, Matt