3 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHMisfire Counter - Page 1 - Porsche General - PistonHeads UK
Leading reported evidence
Use effectively
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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 performed work without a confirmed outcome
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.
Performed · outcome unconfirmed
The misfire counters need context - unless the car is genuinely 'misfiring' and a check light is on they cannot be used effectively on their own.
Misfire Counter - Page 1 - Porsche General - PistonHeads UK
Read full discussion summary
Leading evidence: 'Use effectively' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check here' (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.
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
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 · Original poster
Can anybody shed light on the above and whether there is anything else which should be checked here?
Misfire Counter - Page 1 - Porsche General - PistonHeads UK
Check light is
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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
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
The misfire counters need context - unless the car is genuinely 'misfiring' and a check light is on they cannot be used effectively on their own.
Misfire Counter - Page 1 - Porsche General - PistonHeads UK
Run around 120-150hrs; potentially 11 million individual ignitions
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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
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
A general rule of thumb with mileage/runtime is between 20/25 miles per hour of driving in the UK - so a 3k mile car will likely have been running for around 120-150hrs; potentially 11 million individual ignitions using the above example.
Misfire Counter - Page 1 - Porsche General - PistonHeads UK
Run figures add up
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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
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
If the figures are taken in combination with the total runtime of the engine they can be more useful; other factors like mixture adaption and cylinder specific rough-running figures add up to give a clearer picture of engine health.
Misfire Counter - Page 1 - Porsche General - PistonHeads UK
Run around 120-150hrs; potentially 11 million individual ignitions
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
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.
Suggestion
A general rule of thumb with mileage/runtime is between 20/25 miles per hour of driving in the UK - so a 3k mile car will likely have been running for around 120-150hrs; potentially 11 million individual ignitions using the above example.
Misfire Counter - Page 1 - Porsche General - PistonHeads UK
Run figures add up
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
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.
Suggestion
If the figures are taken in combination with the total runtime of the engine they can be more useful; other factors like mixture adaption and cylinder specific rough-running figures add up to give a clearer picture of engine health.
Misfire Counter - Page 1 - Porsche General - PistonHeads UK
Use above example
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
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.
Suggestion
A general rule of thumb with mileage/runtime is between 20/25 miles per hour of driving in the UK - so a 3k mile car will likely have been running for around 120-150hrs; potentially 11 million individual ignitions using the above example.
Misfire Counter - Page 1 - Porsche General - PistonHeads UK
Use its available sensors and actuators and adapts over time
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
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.
Suggestion
It is not uncommon to see counters in the tens of thousands on perfectly happy engines with 2-3000hrs of runtime on them - the DME effectively micromanages the combustion using its available sensors and actuators and adapts over time.
Misfire Counter - Page 1 - Porsche General - PistonHeads UK
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.
3 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
PistonHeads: 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: 20261026T061123Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi all,
Currently looking at a 718 GT4 and have had the results of the 111 inspection / overrev report.
There are 0 overrevs however there are two codes noted as:
M530_misfire counter total, cylinder 3: 4018
M550_misfire counter total, cylinder 5: 3522
Car is only a couple of years old and approx 3k miles. Can anybody shed light on the above and whether there is anything else which should be checked here?
Thanks
The misfire counter for each cylinder is a cumulative figure that is added to each time the crankshaft speed drops below an adapted threshold.
The misfire counters need context - unless the car is genuinely 'misfiring' and a check light is on they cannot be used effectively on their own. If the figures are taken in combination with the total runtime of the engine they can be more useful; other factors like mixture adaption and cylinder specific rough-running figures add up to give a clearer picture of engine health.
An engine running at a continuous 3000rpm will see 1500 'ignitions' per cylinder per minute.
An hours worth of driving at the same engine speed, 90000 per cylinder.
A general rule of thumb with mileage/runtime is between 20/25 miles per hour of driving in the UK - so a 3k mile car will likely have been running for around 120-150hrs; potentially 11 million individual ignitions using the above example. 4000 misfires would be a miniscule number in this scenario.
It is not uncommon to see counters in the tens of thousands on perfectly happy engines with 2-3000hrs of runtime on them - the DME effectively micromanages the combustion using its available sensors and actuators and adapts over time. When the monitoring is so precise, it is nigh on impossible to have an engine completely free of misfires.
Worth mentioning, the misfire counters have no bearing on the Over-Rev figures - Over Revs are incidents over the engine speed limit, where the engine is forced over the set limit by selection of an incorrect gear at high speed for example; exclusively on manual transmission cars with regard to Porsche.
Edited by Pope on Wednesday 24th August 23:41
