fullymatted.
Back to search
Rennlist

996 TT clunking noise accelerating from stop

Add to repair workspace
Open repair workspace
Original source
16 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCH996 TT clunking noise accelerating from stop

Reported repair

Repair yesterday with hour of labor at a trusted garage

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

1 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 · Original poster

Fixed yesterday with an hour of labor at a trusted garage.

996 TT clunking noise accelerating from stop
Read full discussion summary

Leading evidence: 'Repair yesterday with hour of labor at a trusted garage' (1 discussions report resolution; 0 report an unsuccessful attempt). Across 1 matching discussions, the most frequently mentioned possible cause is 'loose coolant lines' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Repair yesterday with hour of labor at a trusted garage' (1 discussions). For that action, 1 discussions report a resolution and 0 report an unsuccessful attempt. The most frequently reported fix is 'Repair yesterday with hour of labor at a trusted garage', 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.

Read captured replies

1 matching discussions · 16 captured posts examined · 0 partial discussions

Compare 2 other evidence results

loose coolant lines

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 · Original poster

Turned out to be loose coolant lines under the drive train from an earlier dealer repair on the clutch.

996 TT clunking noise accelerating from stop

Repair on the clutch

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

Turned out to be loose coolant lines under the drive train from an earlier dealer repair on the clutch.

996 TT clunking noise accelerating from stop
Frequently discussed actions (2)

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

Repair yesterday with hour of labor at a trusted garage

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

1 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 · Original poster

Fixed yesterday with an hour of labor at a trusted garage.

996 TT clunking noise accelerating from stop

Repair on the clutch

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

Turned out to be loose coolant lines under the drive train from an earlier dealer repair on the clutch.

996 TT clunking noise accelerating from stop
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.

loose coolant lines

No successful repair reported for this finding.

1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
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 · Original poster

Turned out to be loose coolant lines under the drive train from an earlier dealer repair on the clutch.

996 TT clunking noise accelerating from stop
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.

Repair yesterday with hour of labor at a trusted garage

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

1 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 · Original poster

Fixed yesterday with an hour of labor at a trusted garage.

996 TT clunking noise accelerating from stop
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.

16 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: 20261027T140027Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

i'm a new guy in the forum. bought a '04 996 TT cabrio last year with very low miles. love it! i have a clunking noise coming from right under the driver seat (maybe under the center console) when starting from and stop and in 2nd gear. saw it on 924/944 forums but nothing on 996. heading to favorite indy today to diagnose. anyone else have this?

POST 2Original post

Worn out transmission mount and/or engine mounts.

POST 3Original post

Quotes source post: 14482896

Motor mounts was my first thought, but you said under the drivers seat, so I would also check to make sure your seat itself or the DME (or anything under your seat) isn't loose.

POST 5Original post

Quotes source post: 14482933

My thinking is that worn motor mounts might allow the motor/transmission/mount assembly to move fore and aft, (since is all bolted together as a unit) which may cause a thumping felt/heard where the front transmission bracketry bolts to the underside of the tunnel. It is all only connected to the chassis at three points - the two rear mounts and the front mount.

POST 6 / ORIGINAL POSTEROriginal post

Really low miles. 12.5k. Would be surprised if anything is worn.

POST 7Original post

Age will deteriorate all rubber and plastic components...Don't rule anything out.

POST 8Original post

Quotes source post: 14482932

That's my thought too.

POST 9Original post

Quotes source post: 14483069

Right. The weight of the engine has been on those rubber mounts for years and years.

POST 10Original post

Here's what the motor mount looked like in my old Boxte' when I had it replaced: Definitely a loud "thunk" when accelerating from a stop!

POST 11 / ORIGINAL POSTEROriginal post

Fixed yesterday with an hour of labor at a trusted garage. Turned out to be loose coolant lines under the drive train from an earlier dealer repair on the clutch. Torqued a few other bolts for good measure and noise is gone.

POST 13Original post

Quotes source post: 14483559

^^That's the transaxle mount no?

POST 15Original post

Wow - never would have guessed that! Thanks for posting what the resolution was. Congrats on the purchase - post some pics!

POST 16Original post

Quotes source post: 14484711

Loose Coolant lines can also cause a knocking issue that could sound like an engine knock, so not really surprised. Cool!

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