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Shudder/Vibration while slowing to a stop - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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

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YOUR RESEARCHShudder/Vibration while slowing to a stop - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Reported or suspected cause

flywheel balance or a deteriorating pilot bearing

Suggestion or failed attempt

No successful repair reported for this finding.

0
Identified cause
1
Suspected cause
0
Reported fixes
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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 suspect a cause
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.

Suspected cause

It's probably the flywheel balance or a deteriorating pilot bearing.

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Shudder/Vibration while slowing to a stop - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'flywheel balance or a deteriorating pilot bearing' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'flywheel balance or a deteriorating pilot bearing' (1 discussions; 0 report identifying it and 1 suggest it). 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.

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1 matching discussions · 4 captured posts examined · 0 partial discussions

Reported and suspected causes (1)

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

flywheel balance or a deteriorating pilot bearing

No successful repair reported for this finding.

0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect a cause
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.

Suspected cause

It's probably the flywheel balance or a deteriorating pilot bearing.

Original post Read captured discussion
Shudder/Vibration while slowing to a stop - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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.

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

  • 986Forum: 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: 20261026T105141Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hey, My 97 Boxster (2.5L, 64k) has a weird quirk, and since my pre-owned warranty will expire in December, I'd like to figure out what it is before then (or at least know whether it's something to be concerned about at all). When I exit off the interstate every day, I let off the gas around 60-65 mph in 5th gear, and let the car slow itself down (clutch still engaged, though). When it reaches around 50 mph or so, it will shudder/vibrate for about 2-3 seconds as it's slowing down. If I recall correctly, it happens just north of 2krpm. I've also noticed it less pronounced when slowing in 3rd gear at slower speeds -- but I think it happens right around the same point -- 2k-2500 rpm, and only with the clutch engaged. Otherwise, the car is in superb mechanical condition. Any thoughts??

POST 2Original post

When is the last time the tires were balanced?

POST 3 / ORIGINAL POSTEROriginal post

Definitely not a tire balance issue -- it only happens when the clutch is engaged, and you are slowing down (foot entirely off the gas). Besides, it's RPM-sensitive, not speed-sensitive. Hence, it happens around 2k rpm whether you're in 5th gear or 3rd gear. But since you brought it up, for comparison's sake, it's quite a bit LESS violent than a car with badly balanced tires. Thanks for the reply!

POST 4Original post

It's probably the flywheel balance or a deteriorating pilot bearing. We have the same problem between 2700-3200rpm. It's a little worse in the lower gears than the higher ones. Watch the rpm and see if it's the same no matter what speed you are going, then you'll know if it's a driveshaft issue (flywheel, pilot bearing, clutch) or an axle/wheel issue.

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