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Pelican Parts

What are the symptoms of IMS failure?

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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 RESEARCHWhat are the symptoms of IMS failure?

Leading reported evidence

Replace trans

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Suggestion

Replace the trans and check again.

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What are the symptoms of IMS failure?
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Leading evidence: 'Replace trans' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace trans' (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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Run engine

Suggestion or failed attempt

No successful repair reported for this finding.

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Unsuccessful attempts
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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.

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Suggestion · Original poster

I suppose one way to tell is to remove the tranny and run the engine to see if the vibration is still there.

Original post Read captured discussion
What are the symptoms of IMS failure?
Frequently discussed actions (2)

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Replace trans

No successful repair reported for this finding.

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Reported fixes
0
Unsuccessful attempts
1
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Read evidence and context
Discussions that contain suggestions
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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

Replace the trans and check again.

Original post Read captured discussion
What are the symptoms of IMS failure?

Run engine

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 suppose one way to tell is to remove the tranny and run the engine to see if the vibration is still there.

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What are the symptoms of IMS failure?
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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.

  • Pelican Parts: 1 discussions

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Generation: 20261026T113718Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Let's say that the timing is still intact and the car still idles very well and has no apparent noises coming from the engine. My father's 996 with 50k miles has a noticeable vibration when revving the engine. Upon visual inspection of the drivetrain, we noticed that the tranny bellhousing has a crack all the way around. There is a very noticeable vibration when the engine is revved past 3k rpm. Im leaning towards an IMS failure but the bellhousing has me stumped. So either the motor or the tranny is done. I suppose one way to tell is to remove the tranny and run the engine to see if the vibration is still there. Any input? Thanks.

POST 2Original post

First job is to repair the clutch housing as guessing what else may (or may not) be wrong is wasting your time. Replace the trans and check again. IMS failure starts with engine rattles and then the engine stops, this can happen within a block or two. Had one customer drove his Boxster across a street when rattling and then it stopped, broken the timing chain and bent valves.

POST 3Original post

Hi,I have the same problem with my 996 vibrates over 3000 rpms and broke the bell housing,does anyone know what caused this maybe the flywheel

POST 4Original post

Bad dual mass flywheel is one cause I do not know of others. Post this question on Renntech.org and see if anyone has better info.

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