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Spark Plug / Coil - Cause and Effect?

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3 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHSpark Plug / Coil - Cause and Effect?

Leading reported evidence

Replace coil & engine returned

Performed · outcome unconfirmed

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 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 · Original poster

Replaced the coil & engine returned to running super smooth.

Original post Read captured discussion
Spark Plug / Coil - Cause and Effect?
Read full discussion summary

Leading evidence: 'Replace coil & engine returned' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace coil & engine returned' (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.

Read captured replies

1 matching discussions · 3 captured posts examined · 0 partial discussions

Compare 4 other evidence results

Replace plug; no love

Performed · outcome unconfirmed

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 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 · Original poster

Replaced the plug; no love.

Original post Read captured discussion
Spark Plug / Coil - Cause and Effect?

Replace plugs and ignition coils ~35k miles ago

Performed · outcome unconfirmed

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 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 · Original poster

Changed plugs and ignition coils ~35k miles ago.

Original post Read captured discussion
Spark Plug / Coil - Cause and Effect?

Replace six of both

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 · Original poster

My kneejerk is to replace all six of both, but in my 10 minutes of research came across opinions that a faulty plug could destroy a coil and vice versa.

Original post Read captured discussion
Spark Plug / Coil - Cause and Effect?

Run super smooth

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 · Original poster

Replaced the coil & engine returned to running super smooth.

Original post Read captured discussion
Spark Plug / Coil - Cause and Effect?
Frequently discussed actions (5)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Replace coil & engine returned

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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 · Original poster

Replaced the coil & engine returned to running super smooth.

Original post Read captured discussion
Spark Plug / Coil - Cause and Effect?

Replace plug; no love

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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 · Original poster

Replaced the plug; no love.

Original post Read captured discussion
Spark Plug / Coil - Cause and Effect?

Replace plugs and ignition coils ~35k miles ago

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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 · Original poster

Changed plugs and ignition coils ~35k miles ago.

Original post Read captured discussion
Spark Plug / Coil - Cause and Effect?

Replace six of both

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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 · Original poster

My kneejerk is to replace all six of both, but in my 10 minutes of research came across opinions that a faulty plug could destroy a coil and vice versa.

Original post Read captured discussion
Spark Plug / Coil - Cause and Effect?

Run super smooth

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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 · Original poster

Replaced the coil & engine returned to running super smooth.

Original post Read captured discussion
Spark Plug / Coil - Cause and Effect?
Coverage and how to read this overview

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.

3 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: 20261027T013556Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

2004 C2. Changed plugs and ignition coils ~35k miles ago. Denso plugs, aftermarket coils. Couple of days ago, an occasional miss matured to steady over about ten miles and threw a P0303 code. Pulled number 3 coil and plug. Outside of the coil looked pristine, plug degraded from 1mm to 1.3 gap (photo). Replaced the plug; no love. Replaced the coil & engine returned to running super smooth. My kneejerk is to replace all six of both, but in my 10 minutes of research came across opinions that a faulty plug could destroy a coil and vice versa. Note that even the new plug has an asymmetric look at the base of the center electrode; but the failed plug and the new one came from local Advance Auto, so I'm not suspicious of counterfeits, though I suppose anything is possible. So, it comes down to: if it ain't broke don't fix it vs. more failures inevitable, do it and get it out of the way. Your thoughts welcome and appreciated.

POST 2Original post

Do it and get them all out of the way. And, do not use the center point plugs. I had one melt on mine. Went back to the four prong plugs and good ever since. Get the new upgraded 997 coil packs, the correct spark plugs, and get it done. IMO http://www.autoatlanta.com/porsche-p...section=901-00

POST 3Original post

Depends on your car care philosophy, proactive vs, reactive. Me, I tend to be reactive until its time for a major wrenching, such as clutch replacement or my recent cracked head imbroglio. When I do the major wrench, I address everything possible, When i have the car, Franz, back together, I go reactive and drive it addressing things as they pop up. 35K miles isn't a ton for a coil but a bit much for plugs, I would change all the plugs and just the one coil and consider the failed coil an anomaly. Best of Luck!

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