Porsche Club GB

low speed knock front end

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Original source

5 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHlow speed knock front end

Reported or suspected cause

inner ball joint in the steering arm

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
A rare cause is the inner ball joint in the steering arm.
Original post Read captured discussion
low speed knock front end

Frequently discussed work

Check drop links and say ok

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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
OPC have checked the drop links and say OK.
Original post Read captured discussion
low speed knock front end

Read full discussion summary

Leading evidence: 'inner ball joint in the steering arm' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'inner ball joint in the steering arm' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check drop links and say ok' (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.

Read captured replies

1 matching discussions · 5 captured posts examined · 0 partial discussions

Compare 4 other evidence results

Check drop links and say ok

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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
OPC have checked the drop links and say OK.
Original post Read captured discussion
low speed knock front end

Replace with no effect

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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
Topmounts, drop links, bottom arms, etc all changed with no effect.
Original post Read captured discussion
low speed knock front end

Replace anti roll bar bushes (£7 each x 2)

Suggestion or failed attempt

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
If replacing the forked control arms, it isn't much more time (5 minutes) to replace both the anti roll bar bushes (£7 each x 2).
Original post Read captured discussion
low speed knock front end

Replace bushes or the cd's

Suggestion or failed attempt

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 guess it's time to start changing bushes or the CD's to louder music.
Original post Read captured discussion
low speed knock front end

Frequently discussed actions (7)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Check drop links and say ok

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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
OPC have checked the drop links and say OK.
Original post Read captured discussion
low speed knock front end

Replace anti roll bar bushes (£7 each x 2)

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
If replacing the forked control arms, it isn't much more time (5 minutes) to replace both the anti roll bar bushes (£7 each x 2).
Original post Read captured discussion
low speed knock front end

Replace bushes or the cd's

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 guess it's time to start changing bushes or the CD's to louder music.
Original post Read captured discussion
low speed knock front end

Replace forked control arms

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
If replacing the forked control arms, it isn't much more time (5 minutes) to replace both the anti roll bar bushes (£7 each x 2).
Original post Read captured discussion
low speed knock front end

Replace mounts

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
My car is exactly the same so I just turned the radio up at low speeds and haven't got round to changing the mounts.
Original post Read captured discussion
low speed knock front end

Replace mounts and bearings

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
I'm just living with it at the moment until I get round to replacing the mounts and bearings.
Original post Read captured discussion
low speed knock front end

Replace with no effect

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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
Topmounts, drop links, bottom arms, etc all changed with no effect.
Original post Read captured discussion
low speed knock front end

Reported and suspected causes (1)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

inner ball joint in the steering arm

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
A rare cause is the inner ball joint in the steering arm.
Original post Read captured discussion
low speed knock front end

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.

5 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.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261027T005001Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hi Guys I am getting nowhere with sorting a very low speed knock out on my 996 C4, The OPC has looked 2 x and can't find it. It happens at sub 5mph and clunks from front end on slightly rough ground. I may be imagining it but you can feel it through the pedals. OPC have checked the drop links and say OK. Any ideas?

POST 2Original post

No ideas - just sympathy - I have spent a fortune trying to resolve similar issues - i.e. slow bumpy road clunks. Topmounts, drop links, bottom arms, etc all changed with no effect. Have to acertain extent got used to it but still find it more than a little bit annoying.

POST 3Original post

Suspension clonks are frequently mentioned on this forum. Have a search and see. The usual suspects are the lower wishbones (coffin arms), strut upper mounts and bearings and front forked control arms in that order. If replacing the forked control arms, it isn't much more time (5 minutes) to replace both the anti roll bar bushes (£7 each x 2). A rare cause is the inner ball joint in the steering arm. I've replaced all except the strut mounts and mine still knocks at low speed over rough ground although it is much better than before so my noises were multi-factorial. I'm just living with it at the moment until I get round to replacing the mounts and bearings.

POST 4 / ORIGINAL POSTEROriginal post

Thanks Guys, I guess it's time to start changing bushes or the CD's to louder music. At the moment it only happens occasionally and usually at the end of a run, so I may have to wait for it to be more reproducible before I invest in any expensive bits. I'll keep you updated if I eventually solve it. Ian

POST 5Original post

My car is exactly the same so I just turned the radio up at low speeds and haven't got round to changing the mounts.

This is a source reference. Confirm exact model applicability in the original material.