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1999 986 hot start problem - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCH1999 986 hot start problem - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Leading reported evidence

Check fuel pressure, fuel pump rele

Performed · outcome unconfirmed

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 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
Also i checked fuel pressure, fuel pump rele, all is OK, zero mistake at diagnostic.
Original post Read captured discussion
1999 986 hot start problem - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Read full discussion summary

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

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

Compare 2 other evidence results

Replace 1

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
I changed these on my car: new spark plugs, new MAF sensor (Bosch), new idle speed regulator, new thermostat, new air intake temperature sensor, new coolant temperature sensor, new fuel filter, new K&N air filter, new lambda sonde (im from Europe, so on my car are only 2 sensors, but i changed 1, which was bad).
Original post Read captured discussion
1999 986 hot start problem - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Replace these

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
I changed these on my car: new spark plugs, new MAF sensor (Bosch), new idle speed regulator, new thermostat, new air intake temperature sensor, new coolant temperature sensor, new fuel filter, new K&N air filter, new lambda sonde (im from Europe, so on my car are only 2 sensors, but i changed 1, which was bad).
Original post Read captured discussion
1999 986 hot start problem - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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.

Check fuel pressure, fuel pump rele

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
Also i checked fuel pressure, fuel pump rele, all is OK, zero mistake at diagnostic.
Original post Read captured discussion
1999 986 hot start problem - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Replace 1

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
I changed these on my car: new spark plugs, new MAF sensor (Bosch), new idle speed regulator, new thermostat, new air intake temperature sensor, new coolant temperature sensor, new fuel filter, new K&N air filter, new lambda sonde (im from Europe, so on my car are only 2 sensors, but i changed 1, which was bad).
Original post Read captured discussion
1999 986 hot start problem - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Replace these

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
I changed these on my car: new spark plugs, new MAF sensor (Bosch), new idle speed regulator, new thermostat, new air intake temperature sensor, new coolant temperature sensor, new fuel filter, new K&N air filter, new lambda sonde (im from Europe, so on my car are only 2 sensors, but i changed 1, which was bad).
Original post Read captured discussion
1999 986 hot start problem - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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.

2 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

986Forum: 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: 20261027T044418Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hello, could someone help me with problem on my Boxster 1999 2.5l 45000km Europe verison? 1. if i could start hot engine maybe 1-60minutes after the drive, engine starts normal-fast, but engine rev goes at first to 1800rpm and then drop to 200-300rpm and then engine stopped. Sometimes i must restart 5 times, until engine drop only to 400rpm, then goes to 1200rpm-600rpm-1000rpm, then correct idle speed. Sometimes i must push to gas pedal. I changed these on my car: new spark plugs, new MAF sensor (Bosch), new idle speed regulator, new thermostat, new air intake temperature sensor, new coolant temperature sensor, new fuel filter, new K&N air filter, new lambda sonde (im from Europe, so on my car are only 2 sensors, but i changed 1, which was bad). Also i checked fuel pressure, fuel pump rele, all is OK, zero mistake at diagnostic. Thank you very much for your help and any ideas

POST 2Original post

Look a little further down in this forum. This topic was very recently discussed. Possibly fuel tank purge valve.

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