I bought a used 2008 CS last week. Once I started driving it, I noticed some sounds. I have 90 days on a dealer warranty, so if this is an IMS issue/engine internals issue then I want to address it soon.
Got it inspected at a local porsche dealer, their state/used inspection came back good, but I don't think they went deep into diagnosing the sound.
TubeChop - (00:10)
It sounds like it could be a loose heatshield, but it only happens when in gear under throttle. Revving with the clutch in at a stop, or at speed does not reproduce the issue.
Should I get under their with a rubber mallet and tap stuff? If I bring it back to the dealer, should I get a compression test? blackstone analysis? etc.
[EDIT]
Not that a porsche forum is the best place for legal advice, but the verbiage of the warranty is:
any defect, malfunction, combination of defects of defects or malfunctions, that impairs its safety or use for a period of...
Does this mean that the car actually needs to break down before they cover anything?
Loose heat shields are a known problem so worth getting underneath and having a tap around. If not that it could be a catalytic converter starting to break up. Either way, since you have a warranty I would be getting to the bottom of the problem before it expires.
...was not able to play the video you linked
Here is the youtube clip directly.
https://www.youtube.com/watch?v=fO8pkLwTCtw#t=44
first off...the engine sounds awesome
secondly, I am no expert, but here are my two cents...checked out the video...there is a ton of muffled background noise that's making it hard to make out the raspy sound at low RPM. The 5500rpm noise definitely sounds like a rattle that could be coming from the exhaust assembly...I'd start checking the clamps/bolts/nuts at the muffler tip and then move to the O2 sensor and catalysts. While under the car, I'd also look at the axles/CV joint clamps/boots.
Regarding the car not making the rattle noise with clutch in, I had a similar problem with my exhaust tip after putting it back post clutch replacement. I had simple forgotten to fasten a nut. The car did not make the noise when it was not moving. From my experience, these parts of the car are pretty tight in terms of how solidly they sit. I might take some force with a rubber hammer to gain any meaningful insight; nothing destructive, but purposeful.
Good luck!
Could one of the catalytic converters be coming apart internally? Have you brought it back to them or gotten a second opinion?
Good Luck
sounds like you have an aftermarket exhaust, and it sounds really really good. i would guess something is loose and resonating. let the shop do the work. take em for a ride in it. they can place mic's in there and listen for it to isolate.
good luck.
Thanks! It's actually, stock - I just found that driving without the carpet/sound padding on the heat shield makes the car sound way better.
There is definitely a noticeable rattle coming from the reinforcement plate. All the nuts are tightened up pretty good, so I think the next step is to take it off and see what's what.
Is there any resource to find the torque spec for these nuts, or should I just use my judgement with a socket wrench? Also, some of the bolts seem to be pretty stubborn once you get the nut off - should I just tap them out with a hammer?
Most nuts/bolts comprising the suspension have specific torque specs. I'd check the DIY articles here first...if you dont find what you need, send me a PM and I can dig out the appropriate chapters from official service manual and sent it to you in PDF.
Have the same 5500ish sound on my 08. I recently had the exhaust manifolds off and found a loose heatshield. Have not had a change to see if that was the cause.
