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YOUR RESEARCHMisfire on Cylinder 2,4 and 6 - Help!!!!! - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Replace plugs and coils in an attempt
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
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1
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Performed · outcome unconfirmed
As a symptom, he mentions that "customer has replaced plugs and coils in an attempt to fix".
Misfire on Cylinder 2,4 and 6 - Help!!!!! - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Replace plugs and coils in an attempt' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace plugs and coils in an attempt' (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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Misfire on Cylinder 2,4 and 6 - Help!!!!! - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Test those vacuum lines
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Suggestion
Here's a link to keep you on track if you start to pull and test those vacuum lines:
Misfire on Cylinder 2,4 and 6 - Help!!!!! - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Test vacuum-leaks-fuel-trim-head-gasket-restricted-exhaust-low-power-dvom/86-misfire-caused-by-a-vacuum-leak.html
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Misfire on Cylinder 2,4 and 6 - Help!!!!! - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Use generic reader or durametric
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No successful repair reported for this finding.
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Unsuccessful attempts
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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.
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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.
Misfire on Cylinder 2,4 and 6 - Help!!!!! - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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.
7 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 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: 20261026T183130Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hello all.
So i have a strange issue - My 986 Boxster S - tiptonic is showing misfire on cylinders 2 4 and 6!
I have bought a new set of coils and new set of plugs for all 6 but still the same issue - what could be causing this issue on both banks!
Another fault it has come up with is P0413 0 Secondary air control valve A open circuit is that to do with the MAF and could that be the issue?
Thanks in advance!
These faults codes were brought up on the MAC Tools - Mentor Touch Pro Diagnostic Scan Tool
P0413 - Secondary air control valve A open circuit
P0300 - Random / Multiple Cylinders Misfire Detected
P0302 - Cylinder 2 Misfire Detected
P0304 - Cylinder 4 Misfire Detected
P0306 - Cylinder 6 Misfire Detected
Thats all on screen
Hi Byrnsey. I don't want to send you down a rabbit hole, but have you taken a look at your fuel trims? Is the car running rough? If the problem with the SAI is causing a lean condition at idle (RKAT will be some value positive above 0) I'm pretty sure that can cause misfires especially at low RPMs. Here's a link from ScannerDanner that made me respond. As a symptom, he mentions that "customer has replaced plugs and coils in an attempt to fix". He is focusing on a leaking intake manifold gasket, but lean at idle is lean at idle (I think!).
https://www.scannerdanner.com/chapter-1-misfire-id-compression-test-vacuum-leaks-fuel-trim-head-gasket-restricted-exhaust-low-power-dvom/86-misfire-caused-by-a-vacuum-leak.html
If the car is running rough and you find that your fuel trims are indicating lean at idle, perhaps pull some of the vacuum hoses in the area of the SAI and test them with a vacuum hand pump to ensure they hold vacuum? There's also an electronic change-over valve in the SAI that you may be able to activate within Durametric to aid in diagnosing. Here's a link to keep you on track if you start to pull and test those vacuum lines:
http://986forum.com/forums/boxster-general-discussions/64576-vacuum-line-clarification.html#:~:text=The%20manual%20says%20y ou%20should,inches%20of%20vacuum%20at%20idle.
Best of luck!
Hi Byrnsey2, I just experienced misfires on Cyl's 2,3 & 6 last night all at the same time. The car has been running better than ever!
Did you end up figuring out why your's was doing this???
This is a source reference. Confirm exact model applicability in the original material.
