11 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCoil Pack / Sparkplug Replacement?
Reported or suspected cause
good time
Suggestion or failed attempt
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
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Discussions that suspect a cause
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Suspected cause · Original poster
But probably a good time to replace the plugs anyway.
Leading evidence: 'good time' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'good time' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Replace coils and plugs and be done' (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
With 100k just replace coils and plugs and be done with it.
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Suggestion · Original poster
And wouldn't want to replace just the plugs and have to go back in and replace the coils.
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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Suggestion · Original poster
And wouldn't want to replace just the plugs and have to go back in and replace the coils.
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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Suggestion · Original poster
But probably a good time to replace the plugs anyway.
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.
11 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 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: 20261027T201111Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
My car is a 2000 996 C4 Cab and it doesn't feel as spirited as my wife's 2000 996 C2 Cab. Mine has100K miles and hers has 65K miles. Any possibility it might be the coil-packs and/or the sparkplugs? Any way to test it without removing and replacing them? They are probably originals on the car (there is no record of replacing them). Hate to purchase new coils if they are not required. And wouldn't want to replace just the plugs and have to go back in and replace the coils.
Any advice?
I replaced the plugs and coils in my car (99 cab 130k) and did not notice any performance difference. If the plugs have 15k it more miles on them , replace them. If the coils are working, leave them in
If any plug coils were weak or mis-firing, you would be seeing a CEI.
An examination of the spark plugs by an experienced tech would identify any important combustion issues.
I suspect some cause other than the coils and/or plugs, assuming the latter have been changed in a timely manner.
relinuca
It's not like a night and day difference. But her car feels somewhat lighter and more peppy. Maybe just the C2 vs C4?
But probably a good time to replace the plugs anyway.
Spark plug reading is one of the easiest indications of motor performance & identification ain't no rocket science , regardless if its a Rotax, Briggs & Stratton or a 996.
Black --poor rings , compression , spark , timing , rich mixture , AOS , running at too low a temp.
White--she's running too hot , timing , wrong plug , engine will ping or knock , burnt valves will happen.
Plugs should be a light to medium brown color indicating efficient combustion as well as exhaust outlet --however you have the cat converter to consider w/ exhaust pipe
Bob
--------------------------------
01 C4
31 Ford cp chp & ch, 302/350
40 ******, 302/350
38 Ford cp, 327/350
57 Belair
62 356B --long ago
You are wasting hp with the awd. That's why your AWD is slower than the wife's C2. Bottom line is you have a slower car.
Changing the plugs if over 15K mile is crazytalk. Waaaaay too early.
I drove a 2000 C2 Cab and a C4 Cab back to back and was surprised at how heavy the steering and sluggish the C4 felt compared to the C2. The C2 just felt more nimble.
I think the C2 cab is already heavier than a non-cab C2. Add the additional weight of the C4 and maybe that explains it. I really noticed the upfront weight in the steering. Looks like it is only 120 lbs but maybe that is enough.
"However, the advantage to front/rear weight distribution isn't significant, because the entire system adds a mere 120 pounds to the Carrera 4's curb weight." -
http://www.edmunds.com/porsche/911/2000/road-test.html
This is a source reference. Confirm exact model applicability in the original material.
