8 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHP 0305 Cylinder 5 misfire
Leading reported evidence
Replace but
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed
When was the injectors changed but to me isounds like a coil going bad as your motor warms up
Leading evidence: 'Replace but' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Inspect wire and connector' (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.
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Performed · outcome unconfirmed · Original poster
I have changed the spark plug and the coil with a new 997 coil.
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Suggestion
I would also inspect the wire and connector for that coil.
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Suggestion
He is looking at replacing the cam shaft sensor next.
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Suggestion
Assuming you changed the coil and plug for the same reason(P0305): Switch the new coil to a different cylinder to see if the code follows the coil to the new position.
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
Assuming you changed the coil and plug for the same reason(P0305): Switch the new coil to a different cylinder to see if the code follows the coil to the new position.
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.
Rennlist: 1 discussions
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Generation: 20261026T122219Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I have a 2002 996 with a cylinder 5 misfire. I can start the car, in the drive way, and it runs fine with no cel or misfire.. I can drive the car, and as long as I keep driving, no problem. When I stop and idle, the cel comes on, and the car starts running rough which you would expect with a misfire. If I turn off the ignition off, let it sit a minute, and restart the car, the cel stays on, but it will idle as if no misfire. I have changed the spark plug and the coil with a new 997 coil. Any ideas? the cel is always P 0305. No other codes. After a lot of research, i thought it could be a it could be a stuck lifter, but it does clear when I turn off the ignition, but always comes back. Any ideas or things to look at?
When was the injectors changed but to me isounds like a coil going bad as your motor warms up
It has happened to me with non factory parts lately companies are make shizer stuff
Assuming you changed the coil and plug for the same reason(P0305): Switch the new coil to a different cylinder to see if the code follows the coil to the new position. I would pull the plug on #5 to see if it is still in good condition. Might even boroscope #5 with piston at bottom of cylinder while the plug is out.
Any resolution to this?
I took my car in for UAOS, x51 oil pan and now on my black car I'm getting cylinder 5 misfire.
They have changed out coils, spark plugs and injectors. Swapped them also. Misfire is always on 5. I'm thinking of course worse case scenerio such as something fell into the intake and then into cylinder. Car never misfired before I took it in for the UAOS to get it ready for the track.
I've asked them to smoke test the intake and do a leak down test so we can hopefully rule that out.
He is looking at replacing the cam shaft sensor next.
It never misfired for the past 6 years until I took it to them, so my logic thinks the chances of the misfire being directly related to what they did are good.
But the mechanic said the misfire is random so now that's even more puzzling.
Any thoughts on this one? These are great, well respected mechanics.
I would think that your mis fire may have been happening for a time just not enough to set CEL.
Might have been sitting at the Indies long enough to exacerbate the condition, don�t know.
I am going to say based on all the steps taken so far that there is a chance that cylinder 5 may have a lifter stuck in high lift position. Or stuck from time to time. Hard to prove without dropping engine, etc., etc.
Not sure this helps with a fix. Might want to broach the subject with your mechanic.
Yes he is going to do a leakdown test. I have a feeling it's mechanical and in the head as well. Thank you for your response. I'll follow up on this thread.
