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YOUR RESEARCH981 Boxster S Missfire Mystery - Page 1 - Boxster/Cayman - PistonHeads UK
Leading reported evidence
Replace coils and plugs
Performed · outcome unconfirmed
No successful repair reported for this finding.
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0
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1
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981 Boxster S Missfire Mystery - Page 1 - Boxster/Cayman - PistonHeads UK
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Leading evidence: 'Replace coils and plugs' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace coils and plugs' (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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Suggestion · Original poster
In short its nothing mechanical although we are doing a smoke test on the manifold just to be sure but given rev range its highly unlikely this is the culprit.
981 Boxster S Missfire Mystery - Page 1 - Boxster/Cayman - PistonHeads UK
Smoke-test on the manifold just
No successful repair reported for this finding.
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Unsuccessful attempts
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Suggestion · Original poster
In short its nothing mechanical although we are doing a smoke test on the manifold just to be sure but given rev range its highly unlikely this is the culprit.
981 Boxster S Missfire Mystery - Page 1 - Boxster/Cayman - PistonHeads UK
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6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
PistonHeads: 1 discussions
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Hoping someone on here can help...
981 Boxster S (late 2012 car) has a misfire on 1/2/3 and computer says thats all it is.
Only happens between 800-1200 rpm and gets worse when warm.
Coils and plugs have been changed.
Leak down is good at less than 3%.
Earth has been checked and replaced.
No borescoring.
In short its nothing mechanical although we are doing a smoke test on the manifold just to be sure but given rev range its highly unlikely this is the culprit.
Any advice or guidance much appreciated as its a head scratcher...
Well, if you've got compression, and you've got spark, that would suggest fuelling issues. One or more injectors not squirting quite correctly / part blocked?
Had a misfire on a 14 reg 991 S, it was a solenoid that does something to the valve timing! They found this when doing other service work. Sorry not to be upon the tech here but my independent had a couple of others needing same repair and parts were on back order. I hadn’t detected it but car (fairly new to me) did seem a bit sluggish at lower revs.
HTHs
Magnum 475 said:
Well, if you've got compression, and you've got spark, that would suggest fuelling issues. One or more injectors not squirting quite correctly / part blocked?
Thanks, I should have said that the computer will show if its an injector, apparently Porsche diagnostics very good
David W. said:
Had a misfire on a 14 reg 991 S, it was a solenoid that does something to the valve timing! They found this when doing other service work. Sorry not to be upon the tech here but my independent had a couple of others needing same repair and parts were on back order. I hadn’t detected it but car (fairly new to me) did seem a bit sluggish at lower revs.
HTHs
Thanks a great help David, thank you
