fullymatted.
Back to search
Rennlist

2000 996 with positive pressure from oil fill tube

Add to repair workspace
Open repair workspace
Original source
7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCH2000 996 with positive pressure from oil fill tube

Leading reported evidence

Test with small leak around fitting

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

Smoked tested with small leak around fitting for evap.

Original post Read captured discussion
2000 996 with positive pressure from oil fill tube
Frequently discussed work

Check evap purge valve

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 will check for evap purge valve.

Original post Read captured discussion
2000 996 with positive pressure from oil fill tube
Read full discussion summary

Leading evidence: 'Test with small leak around fitting' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'evap system or aux air injection system' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check evap purge valve' (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 · 7 captured posts examined · 0 partial discussions

Compare 4 other evidence results

evap system or aux air injection system

Suggestion or failed attempt

No successful repair reported for this finding.

0
Identified cause
1
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 suspect 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.

Suspected cause

If the MAF is significantly below spec, the fuel trims are pegged at rich and you cant hear any obvious vacuum leaks, suspect the EVAP system or aux air injection system.

Original post Read captured discussion
2000 996 with positive pressure from oil fill tube

vacuum leak, not the maf

Suggestion or failed attempt

No successful repair reported for this finding.

0
Identified cause
1
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 suspect 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.

Suspected cause

Codes most likely a vacuum leak, not the maf.

Original post Read captured discussion
2000 996 with positive pressure from oil fill tube

Check evap purge valve

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

I will check for evap purge valve.

Original post Read captured discussion
2000 996 with positive pressure from oil fill tube

Check maf air flow and fuel trims

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

Hook it up to a durametric and check the MAF air flow and fuel trims.

Original post Read captured discussion
2000 996 with positive pressure from oil fill tube
Frequently discussed actions (6)

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

Check evap purge valve

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 will check for evap purge valve.

Original post Read captured discussion
2000 996 with positive pressure from oil fill tube

Check maf air flow and fuel trims

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

Hook it up to a durametric and check the MAF air flow and fuel trims.

Original post Read captured discussion
2000 996 with positive pressure from oil fill tube

Check oil filler tube cap

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

With the engine running at idle ideally warm idle check the oil filler tube cap for a leak.

Original post Read captured discussion
2000 996 with positive pressure from oil fill tube

Fill with throttle body blocked off

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

Hey guys , I did test it thru oil fill with throttle body blocked off.

Original post Read captured discussion
2000 996 with positive pressure from oil fill tube

Run poorly

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

Customer said was be driven at highway speed then started to run poorly.

Original post Read captured discussion
2000 996 with positive pressure from oil fill tube

Test with small leak around fitting

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

Smoked tested with small leak around fitting for evap.

Original post Read captured discussion
2000 996 with positive pressure from oil fill tube
Reported and suspected causes (2)

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

evap system or aux air injection system

No successful repair reported for this finding.

0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect 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.

Suspected cause

If the MAF is significantly below spec, the fuel trims are pegged at rich and you cant hear any obvious vacuum leaks, suspect the EVAP system or aux air injection system.

Original post Read captured discussion
2000 996 with positive pressure from oil fill tube

vacuum leak, not the maf

No successful repair reported for this finding.

0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect 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.

Suspected cause

Codes most likely a vacuum leak, not the maf.

Original post Read captured discussion
2000 996 with positive pressure from oil fill tube
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.

7 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: 20261026T144035Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hey guys have 2000 996 with positive pressure from crankcase with codes P1128, P1130 runs very rough. Smoked tested with small leak around fitting for evap. Fuel pressure at spec . Customer said was be driven at highway speed then started to run poorly.

POST 2Original post

Codes sound like bad MAF (maybe oil fouled the MAF?). See the article on 996 MAF replacement in the DIY section: https://rennlist.com/forums/996-1998...k1-996-c4.html

POST 3Original post

Codes most likely a vacuum leak, not the maf. Hook it up to a durametric and check the MAF air flow and fuel trims. If the MAF is significantly below spec, the fuel trims are pegged at rich and you cant hear any obvious vacuum leaks, suspect the EVAP system or aux air injection system.

POST 4 / ORIGINAL POSTEROriginal post

I smoke tested it . No leaks

POST 5Original post

Quotes source post: 11552927

With the engine running at idle ideally warm idle check the oil filler tube cap for a leak.

POST 6Original post

Quotes source post: 11552927

Like Rensho said, you may have an "internal leak" at the evap purge valve, the one on the left of the throttle body that carries the fuel vapor into the throttle body to burn. You can try blocking that off and see how the idle changes. Also, have you smoked the crankcase via the oil filler tube and confirmed no leak anywhere?

POST 7 / ORIGINAL POSTEROriginal post

Hey guys , I did test it thru oil fill with throttle body blocked off. I will check for evap purge valve. I don't have any codes purge valve. Thanks for answering quickly .

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