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Old 01-08-2009, 03:40 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, 09:28 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, 12:45 PM   #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, 08:38 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, 09:41 PM   #5
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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, 09:47 PM   #6
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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, 01:47 AM   #7
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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, 01:57 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, 02:03 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, 02:08 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, 05:44 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, 11:10 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, 11:45 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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Old 11-21-2017, 06:03 PM   #14
JDMJEDI
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Wow Iíve been having this same problem for a few years when I let the car warm up itís not as bad tho
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Old 10-11-2018, 02:59 PM   #15
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Default loss of power when acceleration

i have a 2005 subaru impreza 2.5rs 5spd thats running rough, especially when i try to press on the gas. it feels like its not getting any gas but when i take it out of gear i can press on my gas pedal and rpm will go up fine. but when i put it back into gear then it'll start sputtering like no fuel.

ive done a tune up on it replaced plugs/wires, also changed out the O2 sensor since it needed to be replaced. i also put on new headers on the car but from the cat and tailpipe are still the older exhaust. still having the issues but then i had to take it to a shop(non-dealer) since i dont have a garage to work out of and it was raining all that week and i needed my car to be fixed.

the shop have told me that they found the issue and replaced the following. the vacuum lines, pcv valves. that didnt fix it... so they told me that my ECU was needed to be replaced, that didnt fix it... then they told me that my air intake had a leak so they replaced the gasket.

as i we went on a test drive, it was driving great. until i drove it home and now the issues are back to how its been acting up since i brought it into the shop.

im not sure of what could be the cause of this issue since the weather over here has been not on my side. but my boss told me about how his wife's subaru also has a sputtering issue and that when they park their subi on their slanted driveway with the nose of the car facing up the driveway and when its raining, she is unable to start her car and found that they need to be parked with the nose of the car down the slanted driveway, that she doesn't have that issue(even when its raining).

now i park my car on somewhat a flat rocky driveway but could the moisture of all the rain we been having having an effect on how my car is running? if so what should i check to know what i need to fix?
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Old 10-11-2018, 03:07 PM   #16
subaruandmr2
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Quote:
Originally Posted by Rican94 View Post
i have a 2005 subaru impreza 2.5rs 5spd thats running rough, especially when i try to press on the gas. it feels like its not getting any gas but when i take it out of gear i can press on my gas pedal and rpm will go up fine. but when i put it back into gear then it'll start sputtering like no fuel.

ive done a tune up on it replaced plugs/wires, also changed out the O2 sensor since it needed to be replaced. i also put on new headers on the car but from the cat and tailpipe are still the older exhaust. still having the issues but then i had to take it to a shop(non-dealer) since i dont have a garage to work out of and it was raining all that week and i needed my car to be fixed.

the shop have told me that they found the issue and replaced the following. the vacuum lines, pcv valves. that didnt fix it... so they told me that my ECU was needed to be replaced, that didnt fix it... then they told me that my air intake had a leak so they replaced the gasket.

as i we went on a test drive, it was driving great. until i drove it home and now the issues are back to how its been acting up since i brought it into the shop.

im not sure of what could be the cause of this issue since the weather over here has been not on my side. but my boss told me about how his wife's subaru also has a sputtering issue and that when they park their subi on their slanted driveway with the nose of the car facing up the driveway and when its raining, she is unable to start her car and found that they need to be parked with the nose of the car down the slanted driveway, that she doesn't have that issue(even when its raining).

now i park my car on somewhat a flat rocky driveway but could the moisture of all the rain we been having having an effect on how my car is running? if so what should i check to know what i need to fix?
An engine freely revving is very different vs when it is under load. Any CELs? They would be useful for diagnosis. Remember, your engine needs three things: fuel, air, and spark. Begin troubleshooting by eliminating each category.

Spark:
Check your engine grounds, these can cause weird issues.
Pull the coils and take an extra spark plug and have a friend crank the car. Make sure each cylinder is properly sparking the plug.
How old are your spark plugs?

Fuel:
Do a fuel pressure check. You can rent these for free at places like Autozone.
When was the fuel filter last done? Could the fuel pump be dying?

Air:
Do you have any leaks in the intake or exhaust? Are you sure the MAF is good? Water somehow pooling in the intake or filter due to the angle and drainage?
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Old 10-15-2018, 04:46 AM   #17
Hydroracer93R
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What kind of intake are you running? Stock with an air box or a cold air with or without air box? If your running no air box then your probably getting moisture through the filter
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Old 10-16-2018, 12:25 PM   #18
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I have the same problem. Every year. I get 4 misfire codes and a lean code. If I park it in The garage all is good until I start driving in the rain. After a while I will get a fluttering, light misfire and no codes. It goes away as the cockpit warms up. I also believe the ecu warms up. My baby has been ridden hard and put away wet. I can tell she was someone's street racer at one time. Lots of missing covers and shielding. Nuts and bolts that have overturned heads, harness connectors held together with zip ties. Not to forget the skid plate made from street signs) I wonder how many times the ecu has been taken out.
If it was pulled apart, if it is sealed. I do not feel a leak in the footbox. But there is about 4" between the carpet and the floor.. so.. could have rust. I have another ecu. I may try and replace it. (I think it also has Cobb accessport maps inside..) I'm sure there are many other threads out there on this. Perhaps different theories and conclusions.
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Old 10-16-2018, 03:31 PM   #19
Charlie-III
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Quote:
Originally Posted by Dadsquatch View Post
I have the same problem. Every year. I get 4 misfire codes and a lean code. If I park it in The garage all is good until I start driving in the rain. After a while I will get a fluttering, light misfire and no codes. It goes away as the cockpit warms up. I also believe the ecu warms up. My baby has been ridden hard and put away wet. I can tell she was someone's street racer at one time. Lots of missing covers and shielding. Nuts and bolts that have overturned heads, harness connectors held together with zip ties. Not to forget the skid plate made from street signs) I wonder how many times the ecu has been taken out.
If it was pulled apart, if it is sealed. I do not feel a leak in the footbox. But there is about 4" between the carpet and the floor.. so.. could have rust. I have another ecu. I may try and replace it. (I think it also has Cobb accessport maps inside..) I'm sure there are many other threads out there on this. Perhaps different theories and conclusions.
If this is your 95 in your sig, check plug wires. Old wires WILL short to ground when wet/damp out. Yeah, have engine running, lean on radiator support, grab any spark plug wire.
You get zapped (likely to never do that again......), you have an old wire issue.
COP (coil on plug, later models) is not as likely. At least, not multiple cylinders.....
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Old 10-16-2018, 03:33 PM   #20
Dadsquatch
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03 wrx.
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Old 10-16-2018, 03:33 PM   #21
Charlie-III
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BTW, old plugs make old wires more likely to short to ground.......
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Old 10-16-2018, 03:35 PM   #22
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Quote:
Originally Posted by Dadsquatch View Post
03 wrx.
I could look it up, but, central coilpack with spark plug wires or COP?
COP may be leaking valve cover seals (in the plug wells) which can be the same issue, harder to find.
If so, best to do a full valve cover seal set (covers, plug wells, bolt grommets....).
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Old 10-16-2018, 03:44 PM   #23
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Wouldn't give 4 cylinder codes all at once and only after rain.

New headgaskets last year, all new seals. Happens like clockwork. I drive a forester or gf4 on the rainy days. Recently I acquired an ecu out of an 03. I'm going to put it in soon. I wasn't trying to hijack a thread by replying that I have the same problem as the original poster.. 10 years later. Lol. Just throwing some info out. Thanks.
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Old 11-08-2018, 06:28 PM   #24
David Medina
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I have issues in the rain as well. 2003 wrx with 250k. I have k&n short ram, but I have swapped to the stock box with no change. The problem has persisted even after I have changed the plugs and coils. I did everything that the PO171 thread said to do as well. I can tell the change of weather here because the car will misfire when the humidity goes up when i go to work in the morning. I had though it was rain on the filter, but the problem can happen when the car is just sitting.

I have not found a solution yet. My gas mileage has been reduced, but the car runs fairly well 80% of the time. My commute is only 12 minutes now, so i have not panicked about it as much now. Worst part, is i get no CEL at all.
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Old 11-10-2018, 08:17 PM   #25
Peaches02
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Might be getting water into your plugs or coil packs maybe?
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