1 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH2003 C4S - Tiptronic Transmission Problem
Leading reported evidence
Install so i doubt it's
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
The front-to-rear prop shaft was changed at the time the 2nd gearbox was installed so I doubt it's that.
Leading evidence: 'Install so i doubt it's' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Disconnect drive' (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
The 2nd gearbox was replaced on the advice of Porsche Technical who diagnosed it as a Transer Box failure.
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
The front-to-rear prop shaft was changed at the time the 2nd gearbox was installed so I doubt it's that.
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
what happens if you disconnect the drive to the front axle - do you still get the shunt ?
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
When putting C4S on rolling roads its common practice to disconnect the front transmission.
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Suggestion · Original poster
Same is true in Auto mode with reasonably hard though not excessive braking, when the gearbox changes from 3rd to 2nd their is a distinct jolt under those circumstances although this symptom is more intermittent.
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
.........Regarding the gearbox changes, there have been persistent symptons that have prevailed with the last 2 gearboxes that I'm still pursuing with the OPC and Porsche Technical to resolve.
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.
1 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Porsche Club GB: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
1 acknowledgements have no verified action link; they do not establish a repair result.
Outcome without a verified action link
The OPC have had the car back several times since the 3rd gearbox was installed and still not got to the root cause of the symptoms and hence not identified a fix.
Transferred from the C4S Valuation Thread
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JColbourne
PCGB Member
.........Regarding the gearbox changes, there have been persistent symptons that have prevailed with the last 2 gearboxes that I'm still pursuing with the OPC and Porsche Technical to resolve.
In brief there are two gear changes that result in a snatched gearchange effect and a distinct "clunk". One is in 4th gear in Manual mode at around 1,200 RPM 26-28MPH with light acceleration. When I change down to 3rd their is a jolt in the car and a metallic "clunk". Same is true in Auto mode with reasonably hard though not excessive braking, when the gearbox changes from 3rd to 2nd their is a distinct jolt under those circumstances although this symptom is more intermittent. It could be dependent on the amount of bracke force applied. It is similar to the "kick down" effect when accelerating hard in Auto.
Also when accelerating and decelerating i.e. in slow-moving traffic, the "clunk" sound is present and feels like there is play in the transmission system as if something is not tightened up fully e.g. engine mountings although these have been given the OK. The OPC have had the car back several times since the 3rd gearbox was installed and still not got to the root cause of the symptoms and hence not identified a fix. The 2nd gearbox was replaced on the advice of Porsche Technical who diagnosed it as a Transer Box failure. As the symptoms have prevailed across 2 gearboxes, it could be assumed that it's not a gearbox failure. The front-to-rear prop shaft was changed at the time the 2nd gearbox was installed so I doubt it's that. Any clues/similar experiences anyone?
I might start a separate topic on this to get a wider view.
Rgds
John
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Black80XSA
PCGB Member
Just a thought... what happens if you disconnect the drive to the front axle - do you still get the shunt ?
When putting C4S on rolling roads its common practice to disconnect the front transmission. so a short run on road with just RWD might be worth a try.
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Richard Hamilton
Good call.
Also, did the gearbox come with a new torque converter?
Richard
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JColbourne
PCGB Member
I'll mention that to the OPC and see if they've tried/could try that. Prior to the 3rd gearbox going in, there had been one instance of a very loud metallic sound "clanking" from the front nearside of the car (as if a front driveshaft was loose) when I was on a motorway slip road but this went away when the latest gearbox was installed.
Rgds
John
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JColbourne
PCGB Member
Hi Richard,
I asked the OPC the question a few weeks back and was told that each gearbox comes complete with a torque converter.
Rgds
John
This is a source reference. Confirm exact model applicability in the original material.
