8 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHUseful info regarding oil cap. Well I found it useful anyway.
Leading reported evidence
Replace ) and finally the oil cap (i'm obsessed
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
As is customary whenever there is ever an issue with my car I pop open the engine cover, look for anything obvious, check coolant (no, I don't know why either), Power Steering fluid (i'd just had new hi and low pipes replaced) and finally the oil cap (I'm obsessed with making sure there is no mayonase).
Useful info regarding oil cap. Well I found it useful anyway.
Frequently discussed work
Adjust fuel trim
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
If the oil filler cap is left loose or off, excessive un-metered air enters the intake system via this circuit causing the ECM to try and adjust fuel trim to compensate.
Useful info regarding oil cap. Well I found it useful anyway.
Read full discussion summary
Leading evidence: 'Replace ) and finally the oil cap (i'm obsessed' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Adjust fuel trim' (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.
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
I cleared the codes and the engine ran like an absolute dog, just on the verge of stalling.
Useful info regarding oil cap. Well I found it useful anyway.
Adjust fuel trim
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
If the oil filler cap is left loose or off, excessive un-metered air enters the intake system via this circuit causing the ECM to try and adjust fuel trim to compensate.
Useful info regarding oil cap. Well I found it useful anyway.
Check ' i'd not
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
This is when I realised that after my last 'check' I'd not replaced the oil cap correctly!!!!!
Useful info regarding oil cap. Well I found it useful anyway.
Check obvious
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
It's amazing how we always expect the worse when sometimes you just need to take a step back, calm down and check the obvious.
Useful info regarding oil cap. Well I found it useful anyway.
Frequently discussed actions (10)
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Adjust fuel trim
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
If the oil filler cap is left loose or off, excessive un-metered air enters the intake system via this circuit causing the ECM to try and adjust fuel trim to compensate.
Useful info regarding oil cap. Well I found it useful anyway.
Check on older water cooled cars these days
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
From my air cooled days I remember that a possible poor running issue could be tracked to a worn seal on the oil cap, might be worth checking on older water cooled cars these days..?
Useful info regarding oil cap. Well I found it useful anyway.
Check were available relative
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
Yeah it would seem handy if a list of things to check were available relative to the fault codes generated starting with the simplest or most likely first....
Useful info regarding oil cap. Well I found it useful anyway.
Replace ) and finally the oil cap (i'm obsessed
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
As is customary whenever there is ever an issue with my car I pop open the engine cover, look for anything obvious, check coolant (no, I don't know why either), Power Steering fluid (i'd just had new hi and low pipes replaced) and finally the oil cap (I'm obsessed with making sure there is no mayonase).
Useful info regarding oil cap. Well I found it useful anyway.
Run issue could be tracked
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
From my air cooled days I remember that a possible poor running issue could be tracked to a worn seal on the oil cap, might be worth checking on older water cooled cars these days..?
Useful info regarding oil cap. Well I found it useful anyway.
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.
8 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 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: 20261026T155324Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
So, yesterday I was driving back from North Wales to Wolverhampton and something 'odd' happened. Car started off fine but I noticed that the revs were slightly lower than normal, so much so that I actually stalled at some lights. I put this down to piss poor clutch control and carried on with the journey. About 40 minutes later, as I plodded along at 30mpg through some road works on the A55, the CEL comes on even though the car is driving like an absolute dream. As we got closer to home I stopped at a petrol station, bough some stuff and got back in the car, CEL still on. At home I plugged in my faithful £30 ODBII and got 2 HO2S Errors, went straight on the interweb (as you do) and started to panic as there was talk about failed CAT's, replacement sensors etc etc. I cleared the codes and the engine ran like an absolute dog, just on the verge of stalling. As is customary whenever there is ever an issue with my car I pop open the engine cover, look for anything obvious, check coolant (no, I don't know why either), Power Steering fluid (i'd just had new hi and low pipes replaced) and finally the oil cap (I'm obsessed with making sure there is no mayonase). This is when I realised that after my last 'check' I'd not replaced the oil cap correctly!!!!! Screwed the cap on correctly and the engine purred like a kitten within half a second!!!!!!
It's amazing how we always expect the worse when sometimes you just need to take a step back, calm down and check the obvious.
Seem to recall reading somewhere that on the air-cooled engines there is a noticeable drop in revs if the cap is removed with the engine running, too. Perhaps even more critical on later 911s.
My old pseudo vintage sports car has the ubiquitous Rover V8 engine of 80`s vintage and it runs poorly if the oil cap is removed, thus it seems not only Porsche engines suffer this issue.
Yeah it would seem handy if a list of things to check were available relative to the fault codes generated starting with the simplest or most likely first.... Though never having used a code reader, perhaps some already have such a facility...?
The 996 runs a closed-loop scavenge style crankcase ventilation system in conjunction with the air/oil separator. If the oil filler cap is left loose or off, excessive un-metered air enters the intake system via this circuit causing the ECM to try and adjust fuel trim to compensate. This why the car wanted to stall and eventually threw a CEL.
From my air cooled days I remember that a possible poor running issue could be tracked to a worn seal on the oil cap, might be worth checking on older water cooled cars these days..?
This is a source reference. Confirm exact model applicability in the original material.
