11 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH"Grinding" from front end when cold
Reported or suspected cause
axle
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
I had something similar with one of my old BMW AWDs and it turned out to be a bad axle on the front passenger side (had previously been wrecked and badly repaired which included reusing the axle which had been slightly bent).
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
I had something similar with one of my old BMW AWDs and it turned out to be a bad axle on the front passenger side (had previously been wrecked and badly repaired which included reusing the axle which had been slightly bent).
Leading evidence: 'axle' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'axle' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Repair which included reusing the axle' (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
I had something similar with one of my old BMW AWDs and it turned out to be a bad axle on the front passenger side (had previously been wrecked and badly repaired which included reusing the axle which had been slightly bent).
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
Basically everything mechanical from the cabin forward was replaced in the first couple of years trying to correct the issue.
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
In their attempts to solve the problem (without being able to reproduce it) they entirely replaced the following:
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
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Suggestion · Original poster
It will only do it that once for the day until it has cold soaked again (actually in sub-15 weather it only takes a few hours to "reset").
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Repair which included reusing the axle
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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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
I had something similar with one of my old BMW AWDs and it turned out to be a bad axle on the front passenger side (had previously been wrecked and badly repaired which included reusing the axle which had been slightly bent).
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
axle
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
I had something similar with one of my old BMW AWDs and it turned out to be a bad axle on the front passenger side (had previously been wrecked and badly repaired which included reusing the axle which had been slightly bent).
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.
11 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: 20261026T222516Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I'm actually not expecting a solution (you'll understand why), but I'm curious if anyone else has/had something similar.
It's a 01 996 C4 with the full taco-wing aero kit (wing, skirts, and lip) and we've had it since new and it's always been parked outside.
Whenever it's been cold soaked (e.g. parked overnight) in sub-35f temps we get a grinding/rubbing sound from the front end when we back it up and turn to the right. It will only do it that once for the day until it has cold soaked again (actually in sub-15 weather it only takes a few hours to "reset"). This started on it's first cold day (about 8-10 months old at that point). Back it up to the left and there is no noise. Pull it forward either direction and there is no noise.
For the first few years our dealer could never reproduce this issue (never sure how since it happens every time), but they attacked it anyway (which is why I said I would have another Porsche if I ever got the chance as they clearly stand behind their product). Finally we had the tech take it home for a long cold weekend and he reproduced it consistently, but still never could identify what is causing it.
In their attempts to solve the problem (without being able to reproduce it) they entirely replaced the following:
Steering rack and power steering system.
ABS system (pump, front lines, front calipers, sending units, etc..).
Front suspension and control arms.
Front drive system (diff, axels, and hubs).
Basically everything mechanical from the cabin forward was replaced in the first couple of years trying to correct the issue.
My wife and I differ a bit on our descriptions. I think it is coming from the right side, she thinks it's more centered. I think it is more of a feel than a sound (which I think is born out by not hearing anything from outside the car). I think it is more of a plastic/rubber sound (kind like a piece of hard plastic rubbing the treads of a tire), she thinks it's more of a metallic sound.
PASM and the AWD system function flawlessly and there has never been any drive train issue (other than a couple of RMS replacements) with it.
Anyone else experience anything like this?
I'm experiencing something similar although mine seems to be getting progressively worse. I'm also getting a lot of "road noise" at freeway speeds. I don't get any play when pulling/pushing on the wheel but I'm thinking wheel bearing for both of us.
Except in my case the wheel bearings were already replaced and the issue continued on the next cold day a few weeks later. I would also expect additional issues (like you seem to be experiencing) rather than it being limited to just a very specific case (maybe not in the short term, but certainly over 12 years).
Good luck with yours. I had something similar with one of my old BMW AWDs and it turned out to be a bad axle on the front passenger side (had previously been wrecked and badly repaired which included reusing the axle which had been slightly bent).
I have the same noises, but at slow speed when turning. Brutal metal-about-to-break sounds. Hand on shifter; feels like the front diff will snap !
184000 C4S 993
Interesting that I just had this happen to me for the first time the other day (a very cold day). Came out of work and backed out of a parking spot while turning the wheel to the right. I heard what sounded like a scraping sound so I stopped, got out and looked things over, but didn't see anything obvious. It has not happened since (though I haven't had the car out in the cold again), and it definitely never happened prior to that.
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