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Old 06-08-2007, 12:14 PM   #1
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misfire in rain

if i drive in the rain it makes my car misfire. the plugs are brand new and it only happens in the rain. is the water just diluting the mixture? the filter is low but not enough to get soaked or any thing. i figured since the turbo was so hot that none of the water would even make it to the engine but as soon as i get into boost if it is raining my car misses bad. do i need to move my filter up further every time it rains, or could it be something else.

here is a pic of the location



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Old 06-08-2007, 12:18 PM   #2
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Move the filter or get a filter cover. Nice set up. When are you going to turn up the fun? More Boost?
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Old 06-08-2007, 12:28 PM   #3
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Check your ignition wires.

If they have a crack or a kink, moisture can wreak havoc on the system.

Another thing to look for on the wires is scoring or carbon streaking. That would also be an indicator of moisture causing small electrical arcs. Start by checking the boots on the wires for moisture. More often than not, the boots are where cracking takes place.

Electricity follows the path of least resistance. If there is moisture present, then this gets exacerbated.
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Old 06-08-2007, 12:32 PM   #4
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i have checked the wires. i took each one of them off and inspected it really good the last time this happened. when i got home today i popped the hood and the top of the engine was dry but the filter was damp. that is what made me think that that could be it. but im not sure.
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Old 06-08-2007, 12:51 PM   #5
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To me it sounds like you might be having some arching issues with your wires....i had something similar happen with my old turbo talon...when i replaced the wires the problems disspeared....
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Old 06-08-2007, 01:18 PM   #6
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grrr... damn they are almost new but it looks like i will be replacing them to see if they are the problem. what kind of wires did you say you were running john?

i went out and started my car and soaked the plug wires, cool and all kinds of stuff with water. nothing. it doesnt affect it unless it is under boost. and i took my air filter off and the outside was damp but the inside was completely dry.
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Old 06-08-2007, 01:24 PM   #7
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Just a thought....when it's damp outside...do u think it could affect air flow through it ?
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Old 06-08-2007, 01:26 PM   #8
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I get misfires almost every time is rains, it only takes 1 drop of water to mess with the MAF... It happens to me, Tom, Scooby STi and several other FI'd members I know.
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Old 06-08-2007, 01:30 PM   #9
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oh ok. so it is normal then. hmmm... i just put my motorcraft plugs back on. they have 30k miles on them but if it stops then i will by new ones. but if it continues i will put the steeda back on and just live with it, lol.
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Old 06-08-2007, 01:57 PM   #10
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Quote:
Originally Posted by tls_bmx View Post
grrr... damn they are almost new but it looks like i will be replacing them to see if they are the problem. what kind of wires did you say you were running john?

i went out and started my car and soaked the plug wires, cool and all kinds of stuff with water. nothing. it doesnt affect it unless it is under boost. and i took my air filter off and the outside was damp but the inside was completely dry.
I'm not saying that it definitely is the wires, but rather a possibility.

With the turbo under the hood, there is a lot of heat and with the numbers you are producing, a lot of flex in the body.

The material inside the wires may be breaking down and as things heat up under the hood, the water turns to vapor. It could be seeping in through seams in the wires, cracks or other avenues.

It may not even be water. If the material inside is cracked, then you have a break in the path the spark travels. The misfire could be resulting from electricity having to arc inside the wire to complete it's circuit to the plugs. That nanosecond delay could cause a misfire.

I would also check the coil packs for cracking. Over time, exposure to heat, body flex, motor flex and just the elements can cause the plastic to become brittle.

You mentioned soaking the wires and so forth. I wouldn't recommend that as it could create bigger problems for you. I definitely would keep water away from the coils, but a visual inspection of them should be pretty easy.

Don't overlook the spark plugs either. If you have an electrode that isn't properly gapped or if under a particularly hard run you experienced detonation, then one or more could be damaged and leave you with the same result.

The key to all of this is finding which cylinder is creating the misfire. Once that is established, we can further diagnose from there.

After thinking about it, I am more inclined to believe that water is not the issue, but rather a break down in the ignition system itself.
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