20 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHPreventative Coil Replacement?
Leading reported evidence
Replace coils (@70k miles) the engine
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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Discussions that performed work without a confirmed outcome
1
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed
After I replaced my coils (@70K miles) the engine ran MUCH smoother.
Leading evidence: 'Replace coils (@70k miles) the engine' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'tires' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check on the engine' (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 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
After I replaced my coils (@70K miles) the engine ran MUCH smoother.
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 suspect a cause
1
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Suspected cause
- replacing suspect tires before the life is up on them
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Discussions that contain suggestions
1
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Replace coils is not necessary as a preventative maintenance item
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.
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Suggestion
Changing the coils is not necessary as a preventative maintenance item.
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.
20 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: 20261026T150451Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Howdy all,
I have a 2002 C2 with 45,000 miles, and it has only ever had oil/filter and brake fluid changes. I�m planning on doing an air filter and transmission oil change, but I imagine that plugs couldn�t hurt just because of the age. Would you swap your coils while you were doing it, or just leave well enough alone?
She�s never been driven in the rain, always stored indoors, so things LOOK great, but plastic does get brittle... Anything else you�d be anxious to swap out just because of the age?
Thanks!
@45K probably don't need new coils, but if it were me and I was changing out the spark plugs, I would just put in new coils. Make sure you get the upgraded 997 coils.
It had a new OEM part installed at 30,000-ish miles when they put in a Pedro�s Garage direct bearing oiling kit. Same concept as �the solution,� but without a change in bearing design... They also claim zero failures after installation of their kit, so I�m just going to let it riiiide.
Plus the original was 100% perfect, so it doesn�t seem like this car would have been part of the failure demographic anyways.
It also has a new water pump. Outside of the above, 100% original fluids and parts.
If your doing plugs....yeah, do the coils. They are 230 bucks for the upgraded coils from ECS (cheapest I found a month ago).
A word of advice. If you don't want to hate your life just get new exhaust bolts and clamps now in stainless steel. That way you won't have any reservations about taking down the mufflers and you sight lines and range of motion will be dramatically increased.
I didn't drop mine and 3 of the 6 are a real pain that would have been much easier if I could see what I was doing and didn't have to build my rachet extensions from inside that cramped space (because you can't get them in there assembled).
I�d suggest a thorough inspection of your coils before making a decision on changing. If they are visibly cracked, then yes, change coils/plugs. If not, and you are not getting a CEL or engine behavior commensurate with tired coils/plugs then I�d leave it for later.
I wouldn't replace them unless you have misfire issues or visible signs of damage. Unless the cost is irrelevant to you, in which case, sure, replace them.
Changing the coils is not necessary as a preventative maintenance item. However the first design coils were prone to cracking which would cause misfire (especially if wet outside). If they are the original coils i would expect you will find cracking on the housings. If that is the case you will need to replace them.
I had three cracked on a 35k mile motor that was 10 years old.
If youve never changed the plugs on these you will thank me for just buying the coils now for the whopping cost of 230 and just being done with it. It's a no brainier.
Why would one replace properly functioning parts when they are so easy to service if you actually have an issue? It isn't like the coils are buried in an assembly like the inside of the motor or transmission. ' Maybe if the cost is so small as to be insignificant to you? Even $230 seems like a lot of money (to me).
Agree with this. Even when/if you start to get misfire codes, replacing plugs and coil may not fix anything.
I also don�t go and do AOS, RMS, WP - that�s just me. My car has been good for 20 years now with the equipment it has. These cars are expensive enough when something does go wrong that doing preventative maintenance isn�t in my budget when I�m paying $160/hr. That, and they are reliable cars to begin with.
While I don't have any issues with preventative maintenance in general...if the budget allows...I agree with your post, 100%
And, in my case, changing the plugs and coils (3 coils did have cracks) did nothing to correct my misfire codes...which are currently still un-diagnosed.
Mike
Often it�s the same result when folks replace lifters, tensioners, chains, pads to get rid of knocking or rattling.
I think preventative is:
- changing any fluid if you don�t know if it�s been done before
- bore scoping if you have any knocks or worries (that covers about 80% of us, lol)
- water pump or belt if it�s been a long time
- brake pads/fluid if tracking is intended
- running a code check on the engine
- replacing suspect tires before the life is up on them
- AOS (this one is debatable)
- IMS if single row or unknown
I cannot think of much else I would go and replace preventatively. I replace stuff that�s broken and leave the rest to the gods.
FWIW,, I have multiple cars with Coil on plug and they all need new coils about every 35K miles.. The heat kills the plastic.. And the rubber boots at teh plug end get cracked and brittle.. Cheers
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