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Old 01-08-2009, 02:40 AM   #1
1WRX0003
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Default wrx sputtering, but only when it's wet outside?

first time it happened, the RPMs shot up to close to 2k, then dropped drastically, then went up again. This happens fairly regularly, but this time the whole car sputtered and sounded near death. I had the spark plugs replaced.

car worked fine for a couple of months, before the same thing happened again, this time I had the MAF sensor cleaned. Again this fixed the problem temporarily.

Then today, same thing again, but the engine died after just a second or two instead of staying on and sputtering. It has been wet outside/raining each time this has happened.


Any ideas?
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Old 01-08-2009, 08:28 AM   #2
turbobird14
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sound like something electrical.. that would be the only reasonit would act this way only when its wet. start your car when its dry and take a spray bottle with water and squirt over each coil on top of your spark plugs... one at a time. If one stumbles, then you know you have a COP needing replacement. If this doesnt work than keep spraying other parts of the motor and see if you see or feel the symptoms.

PS.... fill out your profile, im sure i wont be the first one to tell ya. it would be nice to see the type of car we are dealing with here.
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Old 01-08-2009, 11:45 AM   #3
smurfwrx
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Could also be a damp filter and/or MAF sensor. Easy stuff to check so just take the time to look them over. If it were MAF related though, I'd imagine you'd have a CEL and a nasty fuel cut when you lay into.
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Old 01-08-2009, 07:38 PM   #4
quazimoto
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You running the stock airbox or intake?If intake,which one?
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Old 01-08-2009, 08:41 PM   #5
msedly
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If you have an aftermarket short ram intake, you are probably getting the filter wet. I am having the same problem with my SPT intake. I'm trying to figure out how to mount a small piece of sheet metal around top of the filter to keep water from dripping directly on the filter. If you're running the stock intake, I've got nothing for ya.
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Old 01-08-2009, 08:47 PM   #6
SUBIEWRX03
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Agree with the air filter being damp. I too had the same problem with my spt intake. Water would run down the ledge under the hood and happens to fall on the filter causing it to stutter for a bit. OP what happens when you drive it around? Does it go away or does it continue to sputter and stall? what mods do you have?
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Old 01-09-2009, 12:47 AM   #7
pDubs
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My spt intake does the same thing. I got on it the other day when it was raining and it sputtered and hesitated.
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Old 01-09-2009, 12:57 AM   #8
globalrex
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this is a bad thing to have cause if you get caught in a bad storm the motor will grenade on you. I have tried so many filters its not funny. The ones that have worked for me are the hks/ greddy style filter and any filter with a cover or a "sock" over it.
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Old 01-09-2009, 01:03 AM   #9
1WRX0003
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Quote:
Originally Posted by dumdum View Post
You running the stock airbox or intake?If intake,which one?
it's an 03 WRX with the SPT intake
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Old 01-09-2009, 01:08 AM   #10
1WRX0003
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Quote:
Originally Posted by msedly View Post
If you have an aftermarket short ram intake, you are probably getting the filter wet. I am having the same problem with my SPT intake. I'm trying to figure out how to mount a small piece of sheet metal around top of the filter to keep water from dripping directly on the filter. If you're running the stock intake, I've got nothing for ya.
Quote:
Originally Posted by SUBIEWRX03 View Post
Agree with the air filter being damp. I too had the same problem with my spt intake. Water would run down the ledge under the hood and happens to fall on the filter causing it to stutter for a bit. OP what happens when you drive it around? Does it go away or does it continue to sputter and stall? what mods do you have?
Quote:
Originally Posted by pDubs View Post
My spt intake does the same thing. I got on it the other day when it was raining and it sputtered and hesitated.
so I guess the SPT intake is what it must be

each time it's happened, i have turned the car off, waited several minutes, turned it on again..and it never becomes driveable. always just idles very erratically, sputters, if it doesn't die altogether.

Is there any simple way to fix this without going back to the stock airbox, or waiting 12 hours until the rain moves out?
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Old 01-09-2009, 04:44 AM   #11
SUBIEWRX03
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Well is not a bad intake its just that if its wet then it becomes a problem although mine never got that bad as you explain. Try checking the filter next time it happens and see if its damp, if not then you might have some other type of problem. Mine would only sputter if it rained and I got on it. You can try the stock airbox for a few weeks and see what happens. Keep us updated.
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Old 01-09-2009, 10:10 AM   #12
msedly
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I think I'm going to try and form a sort of cover out of aluminum that bolts to filter and protects it from water dripping off the hood.
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Old 01-09-2009, 10:45 AM   #13
1WRX0003
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Quote:
Originally Posted by SUBIEWRX03 View Post
Well is not a bad intake its just that if its wet then it becomes a problem although mine never got that bad as you explain. Try checking the filter next time it happens and see if its damp, if not then you might have some other type of problem. Mine would only sputter if it rained and I got on it. You can try the stock airbox for a few weeks and see what happens. Keep us updated.
I went out this morning and poured some water on the filter, car started normally.. think maybe it needs time to really soak through it before the problems start?

poured water around the edge where it's likely to drain in from the hood, and it still ran/started fine. only noticeable thing was after i started it, the idle would drop down to about 200, then rise to the normal 700 or so. it's been doing that for a while now, think that could be tied to the problem too?
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