14 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH928 Misfiring.
Leading reported evidence
Install leads advice welcome
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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Performed · outcome unconfirmed · Original poster
I also replaced the sparkplugs when I fitted the new leads advice welcome.
Leading evidence: 'Install leads advice welcome' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check fuel filter' (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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Performed · outcome unconfirmed · Original poster
Sounds like spark breaking down as had happened in 2019 when I replaced the plug leads it rectified the issue.
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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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Performed · outcome unconfirmed · Original poster
I also replaced the sparkplugs when I fitted the new leads advice welcome.
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
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Performed · outcome unconfirmed · Original poster
Had lunch at the Bowlo (car had cooled down) and went home via the old road at 60 to 80kmh and it ran a lot better but was misfiring a bit when I got back on the M1 and was doing 100 to 110kmh.
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.
14 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Porsche Forum Australia: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
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Generation: 20261027T025149Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Went from Swansea to Mooney Mooney via the M1 on Wednesday in my 1980 928 and about halfway there it started misfiring on 1 or 2 cylinders under load. Was doing about 120kmh and up some decent climbs engine temp was normal and if I backed off or was going downhill it was'nt as bad. Had lunch at the Bowlo (car had cooled down) and went home via the old road at 60 to 80kmh and it ran a lot better but was misfiring a bit when I got back on the M1 and was doing 100 to 110kmh.
Sounds like spark breaking down as had happened in 2019 when I replaced the plug leads it rectified the issue.
So the leads are only a bit over two years old and done only about 12000kms. At the same time I checked the dizzy cap and rotor and they seemed ok and the coil looks original. The green wire has been affected by heat but thats fairly normal for an old 928.
Do the 928 brains trust think it's time to replace the coil or could the leads have gone bad after such a short time. I don't want to spend another $500 on Buru leads again if I don't have to. I also replaced the sparkplugs when I fitted the new leads advice welcome.
Plugs I reckon.
Different kinda vehicle, but my Hiace van was doing the same, and the RAA diagnosed a misfire in cylinder one. I pulled the plug out, and the electrode was missing
😅
🙄
Oz it only happens under high load and when hot. Went for a 30k drive yesterday to try and replicate the fault and it did not play up. Have not had time to check plugs yet.
Replaced plugs on Friday. Went from Chinese made BOSCH WR8DC to Thai made NGK BPR6ES. Old plugs were white with a slight grey colour about half to a third away round the insulator indicating a lean condition.
Questions is it a 3mm allen key that fits the air\fuel ajustment screw. Which direction to richen it up and by how much. Note car starts,idles and did run fine only hiccup was misfire under heavy load and prolonged high speed.
Thanks P-Kay will chase up long allen key when I come back from holidays so will update next month.
Oz fuel filter not due for change for another 3000ks. The filter in the fuel distributer is seized in and I have'nt been able to get it out even with a few hits from a chisel.
If adjustment fails will go down filter replacement route and may have to take top off fuel distributer as a last resort. From memory I tried flushing out the FD filter from the outside with WD40 years ago.
Any advice or tips welcome however leaving for Perth tomorrow so won't be able to reply till next month.
