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Old 05-18-2011, 05:25 PM   #1
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Can RAIN cause a Crankshaft Misfire???

I was driving home before in my 05 Wrangler when my engine started to 'buck' as I accelerated down the road. I had a similar problem about a year ago and it turned out to be a faulty camshaft position sensor. The symptoms are similar this time, but a little different:
1. The engine sputters or bucks at 2500 RPMs, last time it was 3k
2. The idle is very rough, the tachometer will bounce
3. The code being fired out now is P0339, the CRANKSHAFT position sensor
Now, it has been raining here for a few days in a row. Could some wiring possibly have gotten wet? Or is this just wishful thinking?

I searched the forums for any threads regarding the code I have and it came up empty. I saw some similar posts that describe sort of what I am experiencing, but usually with different codes or worse symptoms. Any suggestions?? Anyone else out there have this happen?

Long Days and Pleasant Nights.
Jack

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Old 05-18-2011, 05:33 PM   #2
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Sure it could, it's an electrical device and electricity and moisture don't mix.

Old time tech check for moisture related problems. Spray bottle filled with water.
Spray suspect item and see if it acts up.

Similar to the spray carb cleaner around vacuum connections, if the idle changes you got a leak.

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Old 05-18-2011, 06:35 PM   #3
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A leaking hood gasket can cause it.

The connector for the CPS is in the passenger side, low down, directly under the hood seal.

Water may be getting on it from a drip.

Open the connector, fill it with dielectric grease (keeps the water out) - same stuff you use on spark plug wires. Put it back together. Position it in a better place - probably rearward a little.

Let us know how it works.
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Old 05-18-2011, 06:39 PM   #4
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You can also check the sensor with an ohm meter. Should read give or take 200 ohms.
If your reading is way off, sensor is bad. Note: if it isn't acting up when you check it, it most likely will check good. Oh the joy of electrics.
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Old 05-23-2011, 08:30 PM   #5
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Thanks for the replies, sorry for the delay...I was away this weekend. I checked out the hood gasket and that still seems in tact. However, I am 99.99% sure it was weather related. I attribute the issue to water from underneath. There were a million puddles in my neighborhood that i was driving through. In fact, I went drove through a big one an hour or so before the problem.

I let it dry out and checked things out and everything is good now. I do plan on using the dielectric grease though bc that shouldnt happen when I drive through some water. I'll let you know how that goes. Thanks so much for the help. It was very helpful and reassuring!

-jack
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Old 05-23-2011, 08:37 PM   #6
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And I'll lay money that you aimed for every puddle.

It's a Jeep thing.
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Old 05-23-2011, 09:33 PM   #7
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Every time I see a thread like this for an 05-06 all that pops into my head is OPDA. Hope its not the case for you.

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