9 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH996 Coilpack Problems - symptoms??
Leading reported evidence
Replace plugs
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
What did they look like when you changed the plugs?
Leading evidence: 'Replace plugs' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace 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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
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.
9 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 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: 20261026T120458Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Can anyone describe what the symptoms would be if I had faulty coilpack(s) on my '98 996?
At present, it pulls OK up to about 60mph, then feels a bit rough. Doesn't want to know after about 115mph (on the track of course, :cop: ...)
Struggling to get an exact diagnosis with the OBD reader - just wondering if anyone has had these symptoms,
Cheers
The most common symptom is a misfire under load
What you describe could be any manner of things most likely it's a could pack or a plug, but equally could be MAF problem
I've tried new plugs and it hasn't improved - sorry, should have said.
OBD reader is saying misfire in cylinders 5 & 6 but doesn't pinpoint the coilpacks.
If it were the MAF sensor, would the OBD see a misfire in all cylinders?
Thanks
No, a MAF wouldn't cause a misfire on two cylinders. The fact that it is two cylinders (not a whole bank) means it is most likely coil packs. What did they look like when you changed the plugs? You can usually see the insulation cracking or flaking.
The visible insulation can crack and break down, and you get tracking between coil and earth. Sometimes it gets bad enough to be visible in the dark, so you could try looking underneath at night to see if you can see any flashing on coils 5 and 6.
Odd that you say it pulls fine up to 60mph though - in my (limited) experience a coil pack problem would be manifest at low speeds too. Less so at idle, but with two coils misfiring you would surely notice a roughness and reluctance to pull as soon as you started to pull away from standstill.
By the way, don't be tempted to drive it too much if it is misfiring, if you let too much unburnt fuel get into the cat you have a big bill inbound.
I recently had 2 coil packs replaced and the cars much better. The symptoms were rough idling (+/-100 rpm which is not much but more than normal) and erratic acceleration, it felt like a dead spot on occasion too. The car would keep accelerating but ran out of puff far earlier than usual.
If it's always the same 2 cylinders then it's almost definitely the coil packs or even the new plugs you've fitted. Everything else involved, ignition, intake etc, would produce a more general fault ranging across all cylinders.
Good luck !
This is a source reference. Confirm exact model applicability in the original material.
