7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH2005 C4S Cab Oscillating vibration
Leading reported evidence
Replace engine mounts, serpentine belt, lower and upper control arms
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 · Original poster
I have replaced the engine mounts, serpentine belt, lower and upper control arms, changed tanny and differential fluid and have had my tires road forced balanced.
Leading evidence: 'Replace engine mounts, serpentine belt, lower and upper control arms' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check wheel bearings' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
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.
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.
Replace engine mounts, serpentine belt, lower and upper control arms
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 · Original poster
I have replaced the engine mounts, serpentine belt, lower and upper control arms, changed tanny and differential fluid and have had my tires road forced balanced.
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.
7 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 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: 20261026T183130Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hello all, I'm coming here to ask if anyone has had this and what could be the possible cause. The situation: 2005 C4S Cab. with 63,000 I have an oscillating vibration that is driving me nuts. At freeway speeds the vibration goes up and down in one second intervals. The best way to explain it is like turning up the radio from quiet to loud for one second , then turning it down from loud to soft for another second. Keep doing this up and down every second. The vibration goes up and down in intensity. One second up, then one second down. I feel it in the seats and a little bit in the steering wheel. My radar detector vibrates back and forth as well. It is independent of whether I have the clutch in and coasting or under throttle. I have replaced the engine mounts, serpentine belt, lower and upper control arms, changed tanny and differential fluid and have had my tires road forced balanced. Original IMS. Could this be Tranny mounts? Or...... ? I am hoping someone can give me direction of where to look. Thank you in advance.
Guibo?
Driveshaft flex disc “Guibo” - C4 and Turbo
These folks list the OEM Porsche replacement for $60 KO Performance in Florida
http://www.koperformance.com/
Part #: 102539005-57
KO Price: $60.00
Shipping: $0.00 - FREE Shipping! - & *Ship Group
Stock Status: In Stock - Ready to Ship!
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Book #: 10 2539 005
Description: Driveshaft Flex Disc
Applications: Carrera 4 99 thru 05
Manufacturer: O.E.M.
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Well, I replaced the Guibo/flex disc today. I took it out on a spirited drive and the vibration is 95% gone. The Guibo I took off my car had already started to fail. Cracks and splits all over the disc. My car only has 65k miles on it. I think tranny mounts are the next replacement to try and get rid of the other 5%. Thanks again for the link! Love this forum.
This is a source reference. Confirm exact model applicability in the original material.
