13 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHWhen to replace ignition coils
Leading reported evidence
Check hold down bolt design
Suggestion or failed attempt
No successful repair reported for this finding.
0
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0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that contain suggestions
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Suggestion
An easy way to check while they are still installed is to check the hold down bolt design.
Leading evidence: 'Check hold down bolt design' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check hold down bolt design' (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
An easy way to check while they are still installed is to check the hold down bolt design.
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
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Suggestion
So in my opinion......if your coils are original and you decided to do the plugs, replace them with the updated design.
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Suggestion · Original poster
Is it recommended to replace the ignition coils along with the plugs at this point, or should I just wait for misfires, then replace them one at a time as they fail?
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suggestion · Original poster
Is it recommended to replace the ignition coils along with the plugs at this point, or should I just wait for misfires, then replace them one at a time as they fail?
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.
13 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T124918Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I have a 2001 996 that just hit 120,000 miles. Is it recommended to replace the ignition coils along with the plugs at this point, or should I just wait for misfires, then replace them one at a time as they fail?
Technically ignition coils do not have a service life and should never need replacement unless one fails. Then you would change just the one that failed. However the 996 coils are known to crack. Once they crack the will often fail easily as electricity takes the path of least resistance. An easy example would be if it rains and the cracked coil gets wet the coil shorts out. Then as it dries it may work fine. Porsche realized this issue and developed a newer coil design that seems less likely to fail. So in my opinion......if your coils are original and you decided to do the plugs, replace them with the updated design. If they have been replaced it shouldn't be needed.
One tidbit of information is that the heat shields on my 99 do not fit over the newer (taller) style coils. I am going to fabricate some spacers and will source some longer bolts.
I am dropping my engine pad replacements.
If I have the old style should I just replace all of them? (Even if they don't show wear).
Car is 99 with 100k miles.
They aren't that expensive so it's worth getting them done FWIW mine were the originals from 2004 and all 6 had cracks but were working perfectly fine.
I'm very happy I replaced them as it was only a matter of time.
2005 C4S approximately 54k miles. Spent first 10 years of it's life in Houston, TX. which is HOT! Two were cracked like this. One other had a smaller crack.
Correct about having to move the heat shield out for the newer type coils. I got some SS studs, put those in the block, then a nut to use as a spacer, then heat shields with washer and lock nut. That moved the heat shield out about 5mm and it clears the coils.
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