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2002 996 rough idle & fuel pressure fluctuates

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

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

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YOUR RESEARCH2002 996 rough idle & fuel pressure fluctuates

Leading reported evidence

Check fuel pressure at rail

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
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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
checked fuel pressure at rail using Actron:
Original post Read captured discussion
2002 996 rough idle & fuel pressure fluctuates

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Leading evidence: 'Check fuel pressure at rail' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check fuel pressure at rail' (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.

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1 matching discussions · 2 captured posts examined · 0 partial discussions

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Use actron

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No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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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
checked fuel pressure at rail using Actron:
Original post Read captured discussion
2002 996 rough idle & fuel pressure fluctuates

Frequently discussed actions (2)

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Check fuel pressure at rail

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
checked fuel pressure at rail using Actron:
Original post Read captured discussion
2002 996 rough idle & fuel pressure fluctuates

Use actron

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
checked fuel pressure at rail using Actron:
Original post Read captured discussion
2002 996 rough idle & fuel pressure fluctuates

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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.

2 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: 20261026T172408Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

2002 996 coupe with stock engine noticed engine idles rough at cold start checked fuel pressure at rail using Actron: engine off & pump on via Durametric = 55 psi -> at spec engine on at idle -> fluctuates quickly between 54-60 PSI versus spec of 48 psi Initial diagnosis bad fuel pressure regulator (located in tank). Thoughts? copy+paste URL //flic.kr/p/2nMgboc

POST 2Original post

Not entirely sure why you dont see a lower pressure than 54-60 psi but the fluctuations are probably caused by the injectors firing; pressure drops when an injector opens and rises again when it's closed till the next one opens. Does the needle jitter quicker but smaller amount when you rev the engine to higher rpm?

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