5 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHC4 on a dyno -- Total Disaster!
Leading reported evidence
Inspect damage myself -- ) as part of the fix
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
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
He is now replacing this (I inspected the damage myself -- ) as part of the fix.
Leading evidence: 'Inspect damage myself -- ) as part of the fix' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'pre-existing' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check entire drivetrain/tranny back' (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
It is almost a moot point (the transaxle has now been replaced for $1500 plus labor of 15 hours), but it will indicate whether I can trust my new mechanic (who did the work).
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 suspect 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.
Suspected cause
I asked because you implied you had just purchased the car and that and the above knowledge makes me suspect a pre-existing, to the dyno test, condition.
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
He will also check the entire drivetrain/tranny back to the engine for additional problems.
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
I asked because you implied you had just purchased the car and that and the above knowledge makes me suspect a pre-existing, to the dyno test, condition.
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
It is almost a moot point (the transaxle has now been replaced for $1500 plus labor of 15 hours), but it will indicate whether I can trust my new mechanic (who did the work).
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
I asked because you implied you had just purchased the car and that and the above knowledge makes me suspect a pre-existing, to the dyno test, condition.
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
Enough torque to shear the driveline would undoubtedly spin the non-dyno wheels first giving the test station operator an early warning that something was very, very, wrong.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
pre-existing
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect 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.
Suspected cause
I asked because you implied you had just purchased the car and that and the above knowledge makes me suspect a pre-existing, to the dyno test, condition.
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.
5 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: 20261027T022239Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I posted the following on the 993 forum and several found it useful, so I am posting it here as well!
This is a follow-up to my post regarding the NY State Inspection where they put my 1995 c4 cabrio on the dynometer. It still seemed to run fine after the test, but members of this board told me that the viscous fluid may have burned up.
I took it to the shop and they were able to test drive it to ascertain whether the four-wheel-drive was working -- it wasn't.
The replacement of the coupling was started, and then the mechanic called me to say that the transaxle was sheared! Cut in half! Amazing. He is now replacing this (I inspected the damage myself -- ) as part of the fix. He will also check the entire drivetrain/tranny back to the engine for additional problems.
Obviously, these are costly repairs. The original guy who did the inspection is trying to say that NY State says the owner is responsible for any damage on a dyno -- I will have to sue him to get him to pay.
All of this sucks so bad because I had just gotten the car -- it is my first Porsche -- and now it is in the shop for two weeks -- just missed an Indian Summer weekend in New York!!!
Someone else will need to weigh in to be sure.
But my guess would be that the time on the dyno had nothing to do with the transaxle failure. If it was a 4 wheel dyno then certainly not, and if it was 2 wheel (as implied) then the front wheels would have spun initially as the VC tighten up, not something to be ignored, long before the transaxle sheared.
Plus, I really doubt if the VC can carry enough torque to break the transaxle and certainly not unless the front wheels were locked to prevent them from spinning.
Was a thorough PPI done?
The splines on the transaxle were bent and the coupling couldn't be slid off. The mechanic who did the final repairs showed this to me at the same time that he showed me the sheared transaxle. He claims that my driving the car for 75 miles after the transaxle was sheared on the dynometer "smoothed" out the transaxle on either side of the "cut". As I am writing this, it suddenly occurs to me that maybe he cut the transaxle himself to get the coupling off and then lied to me about it! He claims the engine gave enough torque to the front that it sheared the transaxle.
Besides, does it really matter how it got cut? Ultimately, the repairs necessary came from the initial mistake by the inspector -- he is responsible for the everything that followed.
Can someone let me know if they think the mechanic who did the repairs is lying to me about the transaxle being sheared by the dyno test? It is almost a moot point (the transaxle has now been replaced for $1500 plus labor of 15 hours), but it will indicate whether I can trust my new mechanic (who did the work).
Here in Washington state the emissions testing station only has 2 wheel drive dynos. They NEVER attempt to test any type of AWD or 4WD vehicles, not even those that have a 2 wheel drive mode.
The reason is that it is, potentially, far too hazardous.
Think about it, with one set of driven wheels on the dyno and the other on a flat surface and absent the vehicle being seriously restrained it would/could simply be driven off the dyno. And even were it quite seriously restrained the non-dyno wheels would still spin, assuming a high level of AWD coupling, as engine torque is applied.
Enough torque to shear the driveline would undoubtedly spin the non-dyno wheels first giving the test station operator an early warning that something was very, very, wrong.
PPI is a pre-purchase inspection. I asked because you implied you had just purchased the car and that and the above knowledge makes me suspect a pre-existing, to the dyno test, condition. But then I couldn't say that even a PPI would have caught the fact that the front wheels of an AWD Porsche weren't coupled to the driveline.
Oh, and one more thing. An AWD Porsche with PSM or Trac engaged would never allow the engine torque to rise to the point of damaging any portion of the driveline. As the rear wheels start to spin with the fronts on a high traction surface the system would see a disparity in rotation rates F/R and apply braking at the rear and if the condition persisted it would then dethrottle the engine.
Your not even supposed to tow an awd car except for on a flatbed truck regardless of make or model. I don't understand how you or the inspectors could have allowed the test to be conducted on a two wheel dyno. BTW, why do your states use a dyno. In IL we just sit in the stalls, they connect the tubes to teh exhaust and then we rev teh engines. Thats it.
Bob
This is a source reference. Confirm exact model applicability in the original material.
