7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH996 C4S Tiptronic Transmission Noise
Reported or suspected cause
rubber donut
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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 identifying 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.
Reported cause
Likely culprit is the rubber donut on the front driveshaft, which is easy to check.
Leading evidence: 'rubber donut' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'rubber donut' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check tires are michelin pilot sport ps2 (n3)' (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.
Performed · outcome unconfirmed · Original poster
Quickly went back and double checked, tires are Michelin Pilot Sport PS2 (N3) from 2017/2018 and seem in decent condition.
Replace with a single-weight flywheel in a stick-shift car
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
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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
Talking to the tech he said that while cruising around 50-60 mph, trying to feather the throttle results in a clanking noise similar to when a dual-weight flywheel is replaced with a single-weight flywheel in a stick-shift car.
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 · Original poster
PPI noted that "During the test drive noticed a drive line noise that starts around 50 miles per hour that changes with throttle input.
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.
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Suggestion · Original poster
PPI noted that "During the test drive noticed a drive line noise that starts around 50 miles per hour that changes with throttle input.
Replace with a single-weight flywheel in a stick-shift car
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
Talking to the tech he said that while cruising around 50-60 mph, trying to feather the throttle results in a clanking noise similar to when a dual-weight flywheel is replaced with a single-weight flywheel in a stick-shift car.
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: 20261027T201111Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi All,
Got a PPI done on a 2002 Porsche Carrera 4S with a Tiptronic transmission (776.2) from a reputed tech. PPI noted that "During the test drive noticed a drive line noise that starts around 50 miles per hour that changes with throttle input. Something in the drive line is failing,"
Talking to the tech he said that while cruising around 50-60 mph, trying to feather the throttle results in a clanking noise similar to when a dual-weight flywheel is replaced with a single-weight flywheel in a stick-shift car. Discussed everything from transmission mounts to a remap of the TCU, but couldn't come up with a solid theory.
Not looking to walk into a transmission grenade, so looking for some advice,
Thanks,
SG
Likely culprit is the rubber donut on the front driveshaft, which is easy to check. Other possibilities could be CV joints, wheel bearings, tires, and I would put the transmission last in line. Without hearing the noise it's difficult to locate it to a specific component.
Thanks prf for the response!
The tech was unable to get a recording of the sound while driving the vehicle down the highway. CV joints were replaced in 2018, the noise happens when driving straight down the highway and gets louder with throttle application, so could be the wheel bearings. Tires also seem fine (recently balanced), but good point on the rubber donut on the front driveshaft, I will ask the tech if they saw anything there. I would also agree that it's unlikely that it's the transmission since these 996.2 tiptronics have the reputation of being pretty hearty, but don't want to rule anything out.
It's tough to diagnose noise while driving and even harder on a forum. How familiar is the tech with 996's?
Anyway some other noise sources could be serp belt, A/C compressor bearing, serp belt idlers, induction leaks, motor mounts, trans mount, things not installed correctly, etc.
There's a lot of stuff back there! If someone's repaired something and omitted a bolt or not routed a hose properly it can transmit noise. Saggy motor mounts are very common and can let the power unit move around, perhaps something's touching occasionally.
