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Pelican Parts

Manual C4 Noisy Transaxle venting issue?

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

Discussion summary

YOUR RESEARCHManual C4 Noisy Transaxle venting issue?

Leading reported evidence

Install 10 years ago

Performed · outcome unconfirmed

No successful repair reported for this finding.

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Performed · outcome unconfirmed · Original poster

My trans shifts perfectly and is supposedly (I have records) a low mileage (30K) new trans from Porsche, albeit installed 10 years ago.

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Manual C4 Noisy Transaxle venting issue?
Frequently discussed work

Fill plug

No successful repair reported for this finding.

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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

I pulled the trans oil fill plug to see if it was low on oil.

Original post Read captured discussion
Manual C4 Noisy Transaxle venting issue?
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Leading evidence: 'Install 10 years ago' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Fill plug' (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.

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1 matching discussions · 3 captured posts examined · 0 partial discussions

Compare 3 other evidence results

Fill plug

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 · Original poster

I pulled the trans oil fill plug to see if it was low on oil.

Original post Read captured discussion
Manual C4 Noisy Transaxle venting issue?

Use dual mass flywheel

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

From the factory, Porsche uses a dual mass flywheel to dampen unwanted harmonic and torsional forces, replacement of the dual mass with a single mass will cause these forces to be transmitted to the drive line.

Original post Read captured discussion
Manual C4 Noisy Transaxle venting issue?

Use dual mass unit

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

Porsche uses a Dual Mass unit to dampen the gear rattle because of this.

Original post Read captured discussion
Manual C4 Noisy Transaxle venting issue?
Frequently discussed actions (4)

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

Fill plug

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 · Original poster

I pulled the trans oil fill plug to see if it was low on oil.

Original post Read captured discussion
Manual C4 Noisy Transaxle venting issue?

Install 10 years ago

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

My trans shifts perfectly and is supposedly (I have records) a low mileage (30K) new trans from Porsche, albeit installed 10 years ago.

Original post Read captured discussion
Manual C4 Noisy Transaxle venting issue?

Use dual mass flywheel

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

From the factory, Porsche uses a dual mass flywheel to dampen unwanted harmonic and torsional forces, replacement of the dual mass with a single mass will cause these forces to be transmitted to the drive line.

Original post Read captured discussion
Manual C4 Noisy Transaxle venting issue?

Use dual mass unit

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

Porsche uses a Dual Mass unit to dampen the gear rattle because of this.

Original post Read captured discussion
Manual C4 Noisy Transaxle venting issue?
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.

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

  • Pelican Parts: 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: 20261027T031046Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

My 1999 C4 makes a rattling noise while idling. It gets better when the clutch is depressed but does not completely go away. I believe the trans also makes a noise in 1st, 2nd and 3rd, but again not very noticeable. I put the car up on jackstands yesterday and ran it while underneath. The noise while idling makes a sound like a leaking exhaust, but it is not coming from the exhaust. In fact, it seems to be coming from the top of the transaxle toward the front of the car. I pulled the trans oil fill plug to see if it was low on oil. Very clear oil poured out, which I thought was good. While removing the plug, there was a sucking vacuum. I.e., air either escaped or entered while removing it ( I think air entered). Could there be any correlation between this and the trans sound? My trans shifts perfectly and is supposedly (I have records) a low mileage (30K) new trans from Porsche, albeit installed 10 years ago. This car has an aftermarket single mass flywheel and high performance clutch as well. Before purchasing the clutch supplier told me this type of flywheel will cause rattling at idle. I tend to think the worst, that I have a bad bearing and that trans r&r is in my future.

POST 2Original post

Rattle with single mass (lightweight) flywheel is known byproduct of the flywheel. Porsche uses a Dual Mass unit to dampen the gear rattle because of this.

POST 3Original post

Quotes source post: 10488269

From the factory, Porsche uses a dual mass flywheel to dampen unwanted harmonic and torsional forces, replacement of the dual mass with a single mass will cause these forces to be transmitted to the drive line.

This is a source reference. Confirm exact model applicability in the original material.