16 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHP1364 - Valve lift control cylinder 5 + misfire 5
Leading reported evidence
Check oil cap
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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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 had just added oil the day before and checked the oil cap but it is on tight.
Leading evidence: 'Check oil cap' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'valve is gunked up and stuck open' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check broken valve spring(s)' (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.
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Discussions that suspect a cause
1
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Discussions that contain suggestions
1
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Suggestion
I would stop,, and check for a broken valve spring(s).
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
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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
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Suggestion
Check posts 15,27,28,31 and 33 on the thread in my first response.
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Suggestion
Know you don’t want to hear this and this recommendation means a hefty repair bill, but my hopefully this helps you see a possible pattern and dig deeper to make a more educated decisions.
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.
16 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: 20261027T025149Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Was driving on a slow road when I heard an unusual sound. Stopped and the engine was running rough. I had just added oil the day before and checked the oil cap but it is on tight. Pulled these codes off the durametric. Any one seen this before? Searching did not yield any threads with an outcome. Any help welcome thanks in advance. 2002 C2 Tip
Any chance its the lift control solenoid bracket?
Ok, I really hate to be this guy and hope I am totally off base here, but I have to mention that cylinder 5 misfires occurred on my 997.1 both times before complete engine failures (as well as on a friends 997, same cylinder). Each time it showed up as a small error, similar to what you describe and show on the readout. Admittedly both times occurred while tracking the vehicle (same for friend) but I mention because the misfire code was each time what drew my attention and visit to an Indy like yours. The first completely detonated the case rendering so much damage that it was impossible to tell cause though most assumed IMS.
The second occurred following a similar misfire code on C5. Though I recognized it was concerning to have a similar warning, having replaced the motor and updated the IMS, I assumed it was a coincidence and the Indy wasn’t concerned so why would I be? Looking back I think I just had the same issue happen on two different engines. The second failure wasn’t nearly as catastrophic and was repairable with an engine rebuild which wasn’t fun, but not nearly as bad as the first. I only learned of the third through various follow up discussions, but didn’t dig for details as the car had been long since sold.
It’s been a while but I believe the second was the C5 lifter “holder” failing and falling into the inner workings of the engine. They were able to rebuild unlike the first time but please take this omen seriously and do additional research because it is likely not a coincidence that we all had C5 misfires. Given my hindsight of the three incidents now, I would recommend that with a C5 misfire they pull the engine and review the condition of the lifters and components, replacing as appropriate.
Know you don’t want to hear this and this recommendation means a hefty repair bill, but my hopefully this helps you see a possible pattern and dig deeper to make a more educated decisions. I promise you a complete rebuild is painful and a complete replacement is even more so...
Oil changed. Was last done 4months ago and was pretty dirty.. but zero metal. Misfire condition persists. Indy did a compression test and cylinder 5 has no compression. They suspect valve is gunked up and stuck open.
Check posts 15,27,28,31 and 33 on the thread in my first response. I am not suggesting you do the same......it is just a point of reference on a recommendation (from experts) that ended with "good" results.
My indy is basically suggesting the same, except to use valve cleaner vs ATF. I am NOT pulling the motor out and doing valve replacement.... I will walk away from the car if the valve cleaner/ATF approach does not work, so I do not really have much to lose. Going away for a few days for holiday. Not doing anything till I get back, pretty upsetting news.
Wow did not expect to see this thread pop up on my email. Unfortunately I ended up trading the car in for a slamming deal on one of the last new c7 manual vettes that were left at the time.
