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1999 911 cabriolet constant idle reving

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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 RESEARCH1999 911 cabriolet constant idle reving

Reported repair

Repair leak (new expansion tank installed

Reported resolution
1
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 report a fix
1

1 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 fix · Original poster

I fixed the leak (new expansion tank installed.

Original post Read captured discussion
1999 911 cabriolet constant idle reving
Read full discussion summary

Leading evidence: 'Repair leak (new expansion tank installed' (1 discussions report resolution; 0 report an unsuccessful attempt). Across 1 matching discussions, The most frequently discussed action is 'Repair leak (new expansion tank installed' (1 discussions). For that action, 1 discussions report a resolution and 0 report an unsuccessful attempt. The most frequently reported fix is 'Repair leak (new expansion tank installed', supported by resolution reports in 1 discussions. 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 4 other evidence results

Check oil filler tube

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

Check the oil fill tube for cracks, and the oil cap for proper sealing.

Original post Read captured discussion
1999 911 cabriolet constant idle reving

Clean icv

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

My advice is to clean the ICV and replace ALL of the vacuum lines and be done with it.

Original post Read captured discussion
1999 911 cabriolet constant idle reving

Replace coolant tank

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

Sounds like you caused a large vacuum leak as you were changing the coolant tank.

Original post Read captured discussion
1999 911 cabriolet constant idle reving

Replace of the vacuum lines and be done

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

My advice is to clean the ICV and replace ALL of the vacuum lines and be done with it.

Original post Read captured discussion
1999 911 cabriolet constant idle reving
Frequently discussed actions (5)

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

Repair leak (new expansion tank installed

1
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that report a fix
1

1 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 fix · Original poster

I fixed the leak (new expansion tank installed.

Original post Read captured discussion
1999 911 cabriolet constant idle reving

Check oil filler tube

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

Check the oil fill tube for cracks, and the oil cap for proper sealing.

Original post Read captured discussion
1999 911 cabriolet constant idle reving

Clean icv

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 advice is to clean the ICV and replace ALL of the vacuum lines and be done with it.

Original post Read captured discussion
1999 911 cabriolet constant idle reving

Replace coolant tank

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

Sounds like you caused a large vacuum leak as you were changing the coolant tank.

Original post Read captured discussion
1999 911 cabriolet constant idle reving

Replace of the vacuum lines and be done

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 advice is to clean the ICV and replace ALL of the vacuum lines and be done with it.

Original post Read captured discussion
1999 911 cabriolet constant idle reving
Actions with reported resolution accounts (1)

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

Repair leak (new expansion tank installed

1
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that report a fix
1

1 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 fix · Original poster

I fixed the leak (new expansion tank installed.

Original post Read captured discussion
1999 911 cabriolet constant idle reving
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.

  • 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: 20261027T175704Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I am a new owner of a 1999 911. I've had the car since august 2017. But, did not drive it all winter (New York state), due to a coolant system leak. I fixed the leak (new expansion tank installed. I followed the documented process to bleed the cooling system and all was great. Car was running great for two days. The it seemed to stall just a short distance from home and I was able to coast into my driveway. Now when I start it, it revs over and over from 500 to 2000 rpm's and it want to shut down and struggles to keep running. I thought I had ran out of gas when it shut down and maybe I did. But when I added gas it still rev's up and down over and over. I did put about 2 gallons of 87 octane into tank to get it too a gas station before trying to start it. same rev occurred. Then I added 5 gallons of 93 and still the same issue. The when I opened the engine compartment i noticed the coolant was below the min line. I added about 1 quart and still the engine start is the same... Any help is much appreciated Dave in Saratoga NY

POST 2Original post

Sounds like you caused a large vacuum leak as you were changing the coolant tank. Check the oil fill tube for cracks, and the oil cap for proper sealing.

POST 3Original post

Yes, sounds like a vacuum leak or sticky idle control valve (ICV). My advice is to clean the ICV and replace ALL of the vacuum lines and be done with it. The stock lines/plastic fittings are garbage.

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