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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHRough Idle with Engine light after removing Oil Cap
Leading reported evidence
Repair another one
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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1
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Suggestion
I have plenty of heat shrink, so I'll eventually repair another one for temporary use.
Rough Idle with Engine light after removing Oil Cap
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Leading evidence: 'Repair another one' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Repair another one' (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 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.
Rough Idle with Engine light after removing Oil Cap
Replace 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
In case I crack the pipe, I can use this until I replace the oil filler pipe.
Rough Idle with Engine light after removing Oil Cap
Run extremely rough
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 removed the oil cap on my 2004 996 C2 this morning and not long after putting it back on, the engine started running extremely rough and then threw an engine light.
Rough Idle with Engine light after removing Oil Cap
Run real rough
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
Almost like the car was missing but running real rough.
Rough Idle with Engine light after removing Oil Cap
Run extremely rough
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 removed the oil cap on my 2004 996 C2 this morning and not long after putting it back on, the engine started running extremely rough and then threw an engine light.
Rough Idle with Engine light after removing Oil Cap
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.
10 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: 20261027T061840Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
All,
i removed the oil cap on my 2004 996 C2 this morning and not long after putting it back on, the engine started running extremely rough and then threw an engine light. Almost like the car was missing but running real rough. if i give it some throttle, up to 3k or so and hold it...the engine sounds great, and the engine light goes out, but as soon as it goes back to idle...rough running and the check engine light comes back.
any ideas? im wondering if i somehow introduced an air leak? any ideas?
Make sure the cap is on tightly and correctly, but it sounds like you may have broken the oil filler pipe. Check it carefully for cracks. Mostly happens where the straight part of the pipe meets the corrugated part.
I purchased this:
3:1 Heat Shrink Tubing Adhesive-Lined Heat Shrinkable Tube Waterproof Insulation Sealing DIY (Dia 1/2” (12.7mm)) (Dia 2"(50mm)) : Amazon.ca: Industrial & Scientific
3:1 Heat Shrink Tubing Adhesive-Lined Heat Shrinkable Tube Waterproof Insulation Sealing DIY (Dia 1/2” (12.7mm)) (Dia 2"(50mm)) : Amazon.ca: Industrial & Scientific
In case I crack the pipe, I can use this until I replace the oil filler pipe. I'm thinking I might do it pre-emptively to avoid future cracks.
What Joe said.
I�ve read on here numerous times where someone barely touched that filler tube and it broke. It�s old, brittle plastic that�s under reverse pressure, and constant heat/cooling cycles. And a leak can be hard to spot.
the cap was on extremely tight when i removed it and when i put it back on the filler neck seemed to rotate about 5 degrees...it was covered with intake stuff and i was short on time. ill be getting one on order ASAP
I broke mine while replacing my AOS.
I replaced it with the new "updated" 997 part.
I fixed mine with heat shrink, and then gave it as a temporary fix to someone who broke theirs.
They were going to give me their old one to fix but theirs could not be repaired.
When they bought a new tube, they threw away my old repaired one.
I have plenty of heat shrink, so I'll eventually repair another one for temporary use.
It sounds like the �temporary fix� may be better than the original part, with less chance of failing/cracking in the future. It�s sort of like the BASF �we don�t make things� we make them better� concept
