26 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH**SOLVED** Rough grinding feeling while accelerating and turning
Reported or suspected cause
headlight adjuster
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.
**SOLVED** Rough grinding feeling while accelerating and turning
Read full discussion summary
Leading evidence: 'headlight adjuster' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'headlight adjuster' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check bushings' (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.
**SOLVED** Rough grinding feeling while accelerating and turning
Check bushings
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.
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.
**SOLVED** Rough grinding feeling while accelerating and turning
Check front cv joints
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.
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
Then ignore that diagnoses and check the front CV joints.
**SOLVED** Rough grinding feeling while accelerating and turning
Repair order
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.
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.
**SOLVED** Rough grinding feeling while accelerating and turning
Coverage and how to read this overview
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.
26 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: 20261026T200546Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
So just recently my car has been experiencing a rough, grinding sort of feeling when I am accelerating around a turn or bend.
It happens at speeds as slow as 35mph and upwards.
Smooth as silk when going straight -
Smooth when coasting around a turn -
Rough when accelerating around a turn.
Any thoughts?
(BTW It may or may not be related, but I did the autocross last week...)
and oh yes - my rear brake pads are getting thin but no brake pad warning light yet.
Ok, help us out a little...
1. It's a C4 right?
2. How many miles on the car?
3. Can you tell whether it is coming from the front or the rear?
4. Have you had any work done on any suspension components - wheel bearings, CV joints, differential?
5. Can you feel it in the steering wheel?
6. How much tread is left on your tires?
1. It's a C4 right?
YES C4 TIP S
2. How many miles on the car?
50K MILES
3. Can you tell whether it is coming from the front or the rear?
HARD TO TELL - IT FEELS/SOUNDS LIKE THE REAR - BUT I SORT OF FEEL LIKE I CAN FEEL IT IN THE STEERING...
FEELS MORE PRONOUNCED WHEN MAKING RIGHT HANDERS
4. Have you had any work done on any suspension components - wheel bearings, CV joints, differential?
NO NONE YET
5. Can you feel it in the steering wheel?
SORT OF...
6. How much tread is left on your tires?
TREAD IS OK - BUT RECENTLY DID AUTOX AND I CAN TELL TIRES ROLLED A LITTLE ALONG EDGES.
Then ignore that diagnoses and check the front CV joints.
The transmission mounts may be shot but is so that resulted from the drive line stress/windup cased by failed front CV joint(s).
Ok I will ask them to check it.
While under there we found 3 things:
1. Transmission mounts shot
2. Drive shaft flex disc on it's way out
3. Right side headlight height adjuster broken
(
Anyway she's an 8 year old car that's a daily driver driven through the winters....
With front drive grinding or thumping while turning generally indicates a failing CV joint.
Tighter turns and/or accelerating turns generally exacerbate the problem, more NOISE and you feel "tugging" on the stearing wheel in especially tight turns.
Ever suspect the front differential? I'm not familiar with the C4 but I'm sure the setup is the same as an Audi Quattro but reversed. When was the last time the fluid was changed?
I got my car back.
The grinding is solved.
They replaced the transmission mount bushings.
Whilst there he showed me the drive shaft coupling was going to fail imminently so they replaced the drive shaft too.
Total bill $1,760 including parts and labor.
I was quoted $1,600 by a local indy but I really like my dealer and service team at Herb Chambers Porsche.
I am finding increasingly close pricing between indy and dealer btw...
I think when it comes to small, generally cheap parts (bushings, couplings, etc), going to the dealer vs. an indy makes little difference, since both charge $$ for labor. When you start replacing larger more expensive parts, the dealer charges more every time!
Roadsession, your post gives me hope.
I have similar grinding on a RH turn - (
https://rennlist.com/forums/
showthread.php?t=986840&goto=newpost
)
I will check my bushings.
Can you tell me which part on the bill is the main item in question - so I can see what it looks like and where abouts it is.
