23 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHvibration on pass seat ???
Leading reported evidence
Adjust idle speed slightly will effect it
Suggestion or failed attempt
No successful repair reported for this finding.
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0
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1
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Leading evidence: 'Adjust idle speed slightly will effect it' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Adjust idle speed slightly will effect it' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
You can also change the frequency of the vibration by changing the idle speed (putting on the A/C), or by changing the angle of the seatback.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion
In my car the vibration also changes frequency when I move the sear forward or aft in the track.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion
You can also change the frequency of the vibration by changing the idle speed (putting on the A/C), or by changing the angle of the seatback.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
23 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T163944Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Your wheels are probably out of balance, and/or your tires are shot.
How many miles are on your tires, what make are they, and how are they wearing?
When was the last time you had your wheels balanced? Do you also get shaking in the steering wheel starting around 55 mph?
Tom L
2002 C2
Mine does the same at idle, It has nothing to do with the wheels seeing how the car isn't moving.Now when your driving it could be the tires or the wheels, get them balanced and checked to make sure they are round and true.
The car was designed to have a beautiful woman in the passenger seat whose *** tightly fits the contour of the seat bottom. Absent a passenger of this descrioption, vibration will occur.
I have the same problem with the passenger seat vibrating at idle and at some speeds. I only get to use part number 34-24-36 instead and it seems to work. I will try the suggestion of moving the seat back some.
Ha! Mine has that same problem too -- slight vibration of the passenger seat at idle. I just figured with that beast of a motor underneath waiting to break loose, some vibrations are bound to travel up into the cabin, signaling its intentions.
The vibration is completely normal, but not impossible to change. As several have pointed out, a beautiful woman will stop the vibration. I suspect a fat, ugly woman will also perform the same function although if you use a fat, ugly woman you will notice many other things about the car that bug you.
You can also change the frequency of the vibration by changing the idle speed (putting on the A/C), or by changing the angle of the seatback. In my car the vibration also changes frequency when I move the sear forward or aft in the track. It is also affected by what is held in the pocket on the seatback - I have found the vibration to be worse when I have a few CDs or other items in the pocket. All of this is completely normal. BTW, I have the hard-back seats. I don't know if the regular seats would be the same.
I read somewhere there was a recall on part number 996.36.50.50 I know a local PCA member installed it and something about his car really bothers him.
Installation of 996.36.24.36 or 996.36.50.50 is expensive especially with the diamond option. You should also be aware that if you install either 996.36.24.36 or 996.36.50.50 with the diamond option and then get tired of it or don't like it... trying to change/switch it out or have it uninstalled is a very expensive and time consuming project inwhich you will likely want to pay a professional to handle vs. DIYing. Also getting a used 996.36.50.50 may be less expensive initially but you never know how the previous owner treated or maintained it. Therefore a very thorough PPI is recommended and possibly some type of aftermarket buyers protection/return policy is recommended. Remember always get the newest model you can afford
Oh yeah the vibration is normal at idle.
Mine does it too and my 89 928 that I just sold did it also. I just figure that in PLand some things don't change. As for part #996-36-24-36 I think I will go by the stealer and order one this week and see if you boys know what you are talking about
You gentlemen have missed the point again, always focusing on quick fixes while neglecting the true issue at hand. You shouldn't be attempting to eliminate the seat vibration by installing Porsche part # 996.36-24-36. The vibration was a passenger comfort option intentionally engineered into the natural frequency of the interior cabin to work in conjunction with Porsche part # 996.36.24.36.
My 996 is experiencing the same passenger seat vibration at idle, along with the "check engine" light being on.
Recent diagnosis by Porsche dealer is that one of the camshaft chain tensioners is malfunctioning, affecting the timing on one side of the engine, causing the three cylinders on that side of the engine to misfire. The misfiring (so slight that you'd hardly notice it) and the resulting impact on the engine seem to be causing abnornal engine vibration that's traveling into the passenger compartment/passenger seat.
If this is all true, then the vibration is not normal.
