Porsche Club GB

Pierburg Vacuum unit

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Original source

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

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHPierburg Vacuum unit

Leading reported evidence

Replace unit along

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 · Original poster
Will be replacing the unit along with the starter motor.
Original post Read captured discussion
Pierburg Vacuum unit

Read full discussion summary

Leading evidence: 'Replace unit along' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace unit along' (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 · 3 captured posts examined · 0 partial discussions

Compare 2 other evidence results

Run characteristics

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
This is to aid good slow running characteristics with top end BHP.
Original post Read captured discussion
Pierburg Vacuum unit

Run ok without it is there a real need

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
As it seemed to run OK without it is there a real need to replace it?
Original post Read captured discussion
Pierburg Vacuum unit

Frequently discussed actions (3)

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

Replace unit along

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
Will be replacing the unit along with the starter motor.
Original post Read captured discussion
Pierburg Vacuum unit

Run characteristics

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
This is to aid good slow running characteristics with top end BHP.
Original post Read captured discussion
Pierburg Vacuum unit

Run ok without it is there a real need

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
As it seemed to run OK without it is there a real need to replace it?
Original post Read captured discussion
Pierburg Vacuum unit

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.

3 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
It seemed to make no difference to the running and nothing was said with regards to performance etc at the last major service a few months ago.
Original post Read captured discussion
No unique explicit quoted action; no causal link assigned

Generation: 20261026T183130Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hi, I need your kind help and advice. My starter motor has given up. Well there was a smell of electrical burning and the car just stopped. The AA guy seems to agree dead starter. Reading some of the other threads on replacement I was getting some screeching on start up some times. So maybe was not long for this world anyway. I am now removing all the parts needed to get to the starter. Now while doing this I found that the Vacuum Unit on the back inlet crossover was broken and looks from the amount of dirt on it been detached for some time. It seemed to make no difference to the running and nothing was said with regards to performance etc at the last major service a few months ago. My question is what does it do? It seems to operate a flat in the back tube connecting both inlet plenums. As it seemed to run OK without it is there a real need to replace it? It's a worry not to replace as I am sure it is there for a reason. Would be interested in your views / experiences with this part. Cheers Steve

POST 2Original post

I beleive the unit you are refering to is the control for the resonator flap. Flap closed at low rpm, open at high rpm. This is to aid good slow running characteristics with top end BHP. I don't know what the failure mode is but I would guess either you have poor slow running or reduced max output.

POST 3 / ORIGINAL POSTEROriginal post

Geoff, Many thanks for the info. The actuator arm had become detached and the mounting on the pump broken. The flap seems to have been "open" all the time. It is not sticking so can only assume the plastic body just broke. Or there was some ham fisted servicing in the distant past. Will be replacing the unit along with the starter motor. Steve

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