15 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHFlashinf CEL on acceleration. HELP PLEASE!!!
Leading reported evidence
Check codes and erased them
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Performed · outcome unconfirmed · Original poster
I checked codes and erased them on three seperate ocassions.
Leading evidence: 'Check codes and erased them' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check codes and erased them' (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.
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Performed · outcome unconfirmed · Original poster
Coil packs were cracked and rusted and I replaced them and plugs.
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Suggestion
You said it only happens in the rain.....I'd check for some type of leaks.
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Suggestion
If you replace just 1, 3 and 5 now, you'll be in the engine compartment again shortly replacing 2, 4, and 6.
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.
15 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: 20261026T152433Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
At 65,ooo miles my Carrera is idling rough, but smooth sout while crusing---ONLY IN THE RAIN. Flashing CEL when acceleration and on the rest of the time on.
I checked codes and erased them on three seperate ocassions. The first was P0300, 301, 303. 305., the second was Po300 and 301. The third ocassion was 301. 300, 303. The car runs fine in the dry. 65,000 sservice is complete and no other symptons.
Coil packs.
Error codes are misfires. Light blinks because misfires feed unburned gas and too much of it to the converters which will burn the gas but overheat in the process. Overheating will damage the converters and automakers are on the hook for the converters for 7 to 8 years and 80K or more miles. So anything that puts the converters at risk gets flagged early and often.
Sincerely,
Macster.
Misfires are appearing at cylnders of both banks: Cylinders 1 (P0301) and 3 (P0303) of bank #1 and cylinder 5 (P0305) of bank #2.
P0300 is a general misfire error code.
As poster yasuro suggested and I agree, replace all 6.
If you replace just 1, 3 and 5 now, you'll be in the engine compartment again shortly replacing 2, 4, and 6.
If plugs old and due for replacement might be a good time to change these as well, "while you are there".
Sincerely,
Macster.
Agree. I had one of the little O rings crimped that caused me a code. Again, as others have said - depending on mileage, I'd do the plugs if you have to go in there to look at the coils. Most of the time it's not the coil but the tubes (they crack with age) or the O rings. The tubes are cheap to do - the coil packs not so much. My wife hates the term, 'While I was in there..." as she knows I'm heating up the debt card when she hears that.
No. The rain is a variable and highlights the coil packs are the most likely suspects in the misfire source.
While climate dry and unchanging coil packs are fine. But with rain comes increased moisture in the air (of course) and all surfaces of car and engine exposed to outside air tend to collect moisture. It doesn't take much combined with the dust that is present to collect in coil pack cracks to affect the performance of the coil packs and cause misfires.
Or the engine's fine when started and driven in wet weather conditions but when it is put away road splash on the car evaporates from the heat and the high humidty in the confined area under the and its wheel wells and engine compartment can put moisture on the coil packs (and elsewhere for that matter).
Thus the next time the engine is started the misfires appear.
If the engine is run long enough and gotten hot enough the moisture can be driven from the coil packs. If the remaining solids are not too great the misfire can go away and stay away until the car washed or the wet weather returns.
Sincerely,
Macster.
Sam,
I assume your baby is running smoothly again?
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All is good and that no. 4 plug was a tough one. Easier than a 964 plug change though. Many thanks. P. S. Two coil packs out of 6 were still good. Also replaced mufflers with Porsche Tek.
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