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Porsche Club GB

Vibration on 996 C4S...

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6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHVibration on 996 C4S...

Reported repair

Replace these

Reported resolution
1
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

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.

Discussions that report a fix
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Reported fix

These were replaced and vibration was reduced but not eliminated. A further careful balance of wheels virtually cured the problem although I was subsequently told that this was not an uncommon problem with these cars.

Original post Read captured discussion
Vibration on 996 C4S...
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Leading evidence: 'Replace these' (1 discussions report resolution; 0 report an unsuccessful attempt). Across 1 matching discussions, The most frequently discussed action is 'Replace these' (1 discussions). For that action, 1 discussions report a resolution and 0 report an unsuccessful attempt. The most frequently reported fix is 'Replace these', supported by resolution reports in 1 discussions. These are forum reports and suggestions, not a confirmed diagnosis.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

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1 matching discussions · 6 captured posts examined · 0 partial discussions

Compare 2 other evidence results

Check on a ramp

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

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.

Discussions that performed work without a confirmed outcome
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed

Difficult to diagnose without being checked on a ramp.

Original post Read captured discussion
Vibration on 996 C4S...

Check of wheels/tyres/pressures and go

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

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.

Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

I would start with simple check of wheels/tyres/pressures and go from there.

Original post Read captured discussion
Vibration on 996 C4S...
Frequently discussed actions (3)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Replace these

1
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that report a fix
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Reported fix

These were replaced and vibration was reduced but not eliminated. A further careful balance of wheels virtually cured the problem although I was subsequently told that this was not an uncommon problem with these cars.

Original post Read captured discussion
Vibration on 996 C4S...

Check of wheels/tyres/pressures and go

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

I would start with simple check of wheels/tyres/pressures and go from there.

Original post Read captured discussion
Vibration on 996 C4S...

Check on a ramp

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed

Difficult to diagnose without being checked on a ramp.

Original post Read captured discussion
Vibration on 996 C4S...
Actions with reported resolution accounts (1)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Replace these

1
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that report a fix
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Reported fix

These were replaced and vibration was reduced but not eliminated. A further careful balance of wheels virtually cured the problem although I was subsequently told that this was not an uncommon problem with these cars.

Original post Read captured discussion
Vibration on 996 C4S...
Coverage and how to read this overview

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.

6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

  • Porsche Club GB: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261026T165820Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hi all, Would really appreciate your thoughts on a vibration which occurred yesterday. It was a pleasure to finally stretch the legs on my 2002 996 C4S as we drove through France, Belgium and Germany. Being faster roads I was able to get some speed, but for the first time I experienced a vibration, occurring from 81mph onwards. Anything below 80mph is ok, no vibration. I can feel the vibration through the seat, possibly from the rear if I had to guess, yet nothing via the steering wheel. I took it out of gear while at speed, i.e. coasted, and still vibration, which tells me it’s not engine related?! As you've guessed I'm not a mechanic! What areas do you feel is worth investigating? Wheels and/or tyres? Anything else? As I say, it only happens from 81mph onwards and as we drive overseas each month I’d like to eradicate the vibration. Your thoughts would be greatly appreciated. Thanks

POST 2Original post

Difficult to diagnose without being checked on a ramp. Anything from a wheel balance weight come adrift, bearing, suspension bushes, drive shaft or uneven tyre wear ..... I would start with simple check of wheels/tyres/pressures and go from there.

POST 3Original post

Had a similar problem with my 2002 C4S a few years ago. Car was very low mileage and tyres although not worn were about 6years old. These were replaced and vibration was reduced but not eliminated. A further careful balance of wheels virtually cured the problem although I was subsequently told that this was not an uncommon problem with these cars. Like you it only really showed up on continental trips.

POST 5 / ORIGINAL POSTEROriginal post

Thank you all, I'll start then by buying a pair of new rear tyres. They are actually uneven in thread and one's older than the other.

POST 6Original post

Good call new tyres for some reason 996 4s even if the wheel alignment is ok for some reason some seem to wear on the insides. Good luck.

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