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Old 10-28-2012, 08:45 PM   #1
rvines19
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Member#: 287469
Join Date: Jul 2011
Chapter/Region: NESIC
Vehicle:
2007 Impreza Wagon
Urban Gray

Default runs rough when wet

2007 2.5i wagon. I have this issue only when the car sits outside in the rain for a couple days without being started. usually when I leave the car at the outdoor airport parking lots due to my business travel. I come back to the car after it sitting for 3 days (it rained one of those days) - fire it up and it idles ROUGH, RPMS drop down, shakes like it wants to stall and strange sounding exhaust. i can give it a little gas, sounds normal and then RPMS drop down, idles rough and sounds horrible. Check Engine Light will flash a couple times - then about 5 minutes runs fine, CEL goes off.

Last time it occurred, P0303 misfire was found, but dealer didn't find any problems. Suggestions? From what i read, seems it could be
1) coil pack and spark plugs
2) harness behind battery might be getting wet
3) Mass air flow (MAF)

Before Hurricane Sandy comes tomorrow, I would like to see if i can figure it out.

Thanks,
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Old 10-28-2012, 10:33 PM   #2
alt14
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Member#: 271928
Join Date: Jan 2011
Chapter/Region: Tri-State
Location: Gettysburg PA
Vehicle:
2014 WRX Limited
Crystal Black Silica

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It might be moisture building up, when I did my friends timing belt on his legacy it had a lot of moisture buildup from not being ran for a while I'm assuming, after about ten minutes of idling most of the moisture was gone from the tail pipe and clear exhaust, the car was running a little rough at first but now is running fine
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Old 10-29-2012, 03:31 PM   #3
rvines19
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Member#: 287469
Join Date: Jul 2011
Chapter/Region: NESIC
Vehicle:
2007 Impreza Wagon
Urban Gray

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UPDATE well, lucky for me - my office was closed due to Sandy. About 11 am, i ran out to fire her up and the same problem occurred... Drove about 2 miles, with noise, lack of power, flashing CEL and then it stopped and car drove OK. I live about 5 minutes from dealership. Took her in, P0303 code -- they replaced the coil pack and wires. However, wasn't covered under warranty. Lets see if she fires up later tonight or tomorrow morning..
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Old 10-30-2012, 08:24 PM   #4
GreenL
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Member#: 177721
Join Date: Apr 2008
Chapter/Region: MAIC
Location: Pine Grove, PA
Vehicle:
1995 Impreza L
ABP

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This happened to me when I had my NA....turns out it was a ripped spark plug wire
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Old 11-11-2012, 08:21 PM   #5
Rudgers73
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Member#: 141433
Join Date: Feb 2007
Chapter/Region: MAIC
Location: Rochester, NY
Vehicle:
2006 Impreza 2.5i
Obsidian Black

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Check plug wires and knock sensor
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Old 11-13-2012, 03:40 PM   #6
gdoggmoney
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Member#: 158150
Join Date: Sep 2007
Chapter/Region: MAIC
Location: some place
Vehicle:
2007 Impreza 2.5i
Newport Blue pearl

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Old plug wires can dry up, and not seal allowing moisture into the coil pack connections and the spark plug wells, both bad places to have moisture.
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Old 11-17-2012, 06:37 PM   #7
klaus_b2
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Location: North Carolina
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mine does the same thing! exhaust sound and everything...and sometimes, even white smoke comes out my exhaust which means water. but after 5 minutes like you said she runs fine..
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