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YOUR RESEARCHMisfiring after washing my car
Leading reported evidence
Check before they potentially leave you stranded somewhere
Performed · outcome unconfirmed
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1
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Read evidence and context
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Performed · outcome unconfirmed
Worth having them checked before they potentially leave you stranded somewhere.
Leading evidence: 'Check before they potentially leave you stranded somewhere' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'cause of the brake issue' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check before they potentially leave you stranded somewhere' (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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Run pretty well however still misfired however rarely
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
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Performed · outcome unconfirmed · Original poster
The engine ran pretty well however still misfired however rarely.
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
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Suspected cause · Original poster
I think that clogged drains and a brake booster issue is the cause of the brake issue but I am more interested in the misfiring issue.
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.
8 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261027T082735Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Today I washed my car at my home, just as I always do- lots of water. When I was finished I started the car, it didn't idle correctly. When I tried to accelerate, the car hesitated quite significantly. It seemed to be fine at speed. I stopped and listened to the engine and occasionally the engine would misfire. I did not get a CEL. The engine never stalled. Also, after washing the first few times of braking, the brake was quite rigid. It lightened up after a few minutes.
When I got back home, I hooked the car up to my durametric and it showed a few codes.
P1319 Misfire, Emission Relevant
P1318 Misfire, Cylinder 6, Emission Relevant
P1317 Misfire, Cylinder 5, Emission Relevant
P1313 Misfire, Cylinder 1, Emission Relevant
I let the engine air out for a few minutes. The engine ran pretty well however still misfired however rarely. I let the engine sit even more and now everything seems fine.
I have not had problems with my car. It normally runs great. I wash my car often and drive it in the rain frequently and I have never had this issue. It is a 00 C2 with 72k. I have read a few forums that mention others having a similar problem- most of the discussions had to do with a bad brake booster and also ridiculing the person for going through a drive through car wash. I think that clogged drains and a brake booster issue is the cause of the brake issue but I am more interested in the misfiring issue. I assume that I got a little water into the intake. Seems like things have dried out and are now ok. Is there anything else that I should look into or anything else I should consider? I don't really understand why I would only get misfires in 3 cylinders if I got water in the intake, seems like it would be all of them.
Thanks,
Steve
I had the same experience and similar codes one time after a very heavy rain with very strong wind. Let it sit overnight and it was fine the next day. That several months ago and the car has been running great ever since. Service manager thought it was just some water getting to the coil packs.
Most likely, location is the key to the failure of the coils , and why Porsche fit a shield on the 996 I believe: With the engine behind the wheels, all the crap from the road, inc the puddles we've all been through lately; all bombard the sides of the engine and soak the coils, the shield can only do so much. Boxster engines are more encapsulated with only half the engine visible from underneath until the undertray is removed.
The plastic of the coil pack cracks over time, most likely due to heat/cool cycling, and when they are cracked, water can get in and cause misfires.
Possible the OP jetted water into the rear wheel wells, and this got to the coil packs.
Worth having them checked before they potentially leave you stranded somewhere.
water just reveals the underlying issue with the ignition (facilitates arcs if there are cracks). If it happened once, it will happen again.
I just had both banks done under warranty a couple of weeks ago, along with a valve solenoid on the misfiring cylinder (#3).
It's a DIY if outside of warranty, and I think it's worth doing, especially if you feel misfires at low RPM or idling.
This is a source reference. Confirm exact model applicability in the original material.
