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YOUR RESEARCH2002 996 misfire
Leading reported evidence
Clean dirty, oily, dark
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No successful repair reported for this finding.
0
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0
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1
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Suggestion
Exceptionally clean, dirty, oily, dark with carbon or other deposists; or just normal?
Leading evidence: 'Clean dirty, oily, dark' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean dirty, oily, dark' (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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5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Has anyone been able to diagnose misfires on cyl 1 and 2 ? we've tried coils, lifters, plugs, and air/oil separator....to no avail . thanks for helping.
Misfires -- CEL blinking or just on steady? -- on one side can be a failing or failed VarioCam acutator, solenoid. I mean you've eliminated the most common causes, assuming the new coils/plugs are good, correct, and all the hook up and connections are good.
If a VarioCam actuator or solenoid bad enough this might generate an error code in its own right. In the meantime, it might just generate a misfire.
A misfire in just one cylinder can be a bad injector but engine controller will attempt to adjust/adapt by if injector blocked injecting more fuel in the other cylinders. Long term fuel trim on this bank will reflect any enrichening or leaning (if the bad injector leaking) of the air fuel mixture.
Another source of a misfire can be a burned valve. I've seen this happen on just one valve -- exhaust -- in an engine but if one cylinder can experience a burned valve, two cylinders can.
Adjacent cylinders experiencing the same symptom suggests a common failure between them: intake manifold leak; head gasket leak; or cracked head; porous head or block.
What do long term fuel trims look like?
What did the old plugs look like from these cylinders? Exceptionally clean, dirty, oily, dark with carbon or other deposists; or just normal?
What do the new plugs look like?
And of course the misfire can be an early sign of more serious troubles with the camchain drive. What is engine noise like?
Sincerely,
Macster.
When does the misfire and CEL happen? Right at startup? A worn/bad flywheel can result in a misfire and subsequent check engine light a couple seconds after startup.
Hey all, thanks for the reply, the misfire takes up to 5-7 minutes to occur and the CEL light flashes and eventually stays on. I will investigate all these ideas and post again, thanks Ken911
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