15 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
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Discussion summary
YOUR RESEARCH2004 996 C4S: Help me identify this noise!
Leading reported evidence
Replace aos and request they bore scope the cylinders
Suggestion or failed attempt
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Suggestion
If the car is going to the shop for a clutch, flywheel, and IMSB replacement, I'd advise you to also replace the AOS and request they bore scope the cylinders to know the condition of the cylinder bores.
Leading evidence: 'Replace aos and request they bore scope the cylinders' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace aos and request they bore scope the cylinders' (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.
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Replace clutch and flywheel ( and address the imsb)
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.
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Suggestion
My advise is to stop getting opinions and replace your clutch and flywheel ( and address the IMSB).
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.
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Replace aos and request they bore scope the cylinders
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
If the car is going to the shop for a clutch, flywheel, and IMSB replacement, I'd advise you to also replace the AOS and request they bore scope the cylinders to know the condition of the cylinder bores.
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.
15 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T172408Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hello, my 04 996 C4S 6-Sp. w/ 58K miles has developed a troublesome ticking or clicking sound when revved in neutral or with even just a slight application of the throttle above 2K while in motion. I first noticed it a week ago when driving on the freeway (left lane, of course) next to the concrete barrier so I could hear the reflections. Also, it is just now cooling off here in Phoenix so of course windows up all summer... I have no idea how long this condition has existed. Please if you can, I'd love to have some educated guesses as to what this could be:
Vimeo
Thanks in advance.
Also worth noting, clutch is starting to slip. Will be replacing shortly along w/ IMS. Not sure if this sound is related to that.
More knowledgeable members hopefully will post, but I would have the bores scoped before spending $ on the other work. Or make sure the qualification process is followed before imsb installation.
Step 1. Remove the belt and see if the noise remains. If it doesn't, rotate each part for any unusual feel. Step 2. If the noise is still there, consider scoping the cylinders; there's a segment in of one of the flat six videos on how that is done. GLWS
Thanks for the input. Clutch is a done deal, 58K on the original so I feel I've got the useful life out of it. IMS usually a foregone conclusion since you're dropping the tranny, might as well get it done. But now this new sound is concenring.
Sounds like your dual mass flywheel is SHOT to me !!!
Did you post this video on FB a few days ago? I think I commented on it also.
My advise is to stop getting opinions and replace your clutch and flywheel ( and address the IMSB). Then report back with good news !!
You are likely to get many opinions from bore scoring, to IMSB, to rod bearings, and lots of procedures like UOA ect...
Trust me your DMF is DONE...
Porschetech3 knows what he is talking about.
Interestingly, I have the same issue with my F250 SD 7.3 liter truck. It has a manual transmission. Turns out it has a DMF! It has plastic spring keepers on the springs between the two sections of the DMF. The plastic keepers eventually degrade and the DMF starts clunking during specific rpm/load conditions.
If the car is going to the shop for a clutch, flywheel, and IMSB replacement, I'd advise you to also replace the AOS and request they bore scope the cylinders to know the condition of the cylinder bores.
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