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Old 05-07-2012, 06:38 PM   #1
skubaru
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Default N/A subie idles at VERY low rpms

Car: 2.5rs 2002 subaru impreza bugeye.
143K miles, all stock, manual.
Recently changed oil, oil filter, spark plugs.

Basically the car idles at very low rpms, and feels like it's at the verge of dying, and then goes back up very slightly and stays there at below 500 rpms I believe.

I also found oil in the engine bay and it's for sure not there by someone accidentally spilling it because I wiped it and in about a week the oil was back in the same spots.

What could be the cause?

RPMS-


OIL- Left side of the engine bay
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Last edited by skubaru; 05-07-2012 at 06:45 PM.
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Old 05-07-2012, 07:14 PM   #2
sanguines
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My old 2.5i had a very low idle like that, particularly when the AC was on. The dealership said it was nothing to worry about. I thought it was irritating because it caused the car to be kind of jerky when starting out, but nothing super concerning.
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Old 05-07-2012, 07:52 PM   #3
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It's like this for me even w.o the AC. Hopefully it's nothing to major, but the reoccurring oil in the engine bay concerns me.
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Old 05-07-2012, 08:41 PM   #4
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I have an 09' Impreza 2.5i that has this issue and actually stalls coming to a stop sometimes. It's only happened twice. One time during a cold snap here in FL, and another time a couple weeks ago. It stalls 3 times then it's fine like nothing happens
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Old 05-07-2012, 10:45 PM   #5
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Any solutions?
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Old 05-07-2012, 11:58 PM   #6
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Nope lol.
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Old 05-08-2012, 12:00 AM   #7
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Oh yea I had an oil leak too on the driver side, but the dealership just called it "seepage" and showed me that no oil had leaked onto anything else like my exhaust. It hasn't come back though.
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Old 05-08-2012, 12:26 AM   #8
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Hmm, yeah mine is on the passenger side, and it shows back up even if I wipe it off. Gotta do something about the RPM's tho, they're scary low.
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Old 05-08-2012, 06:26 AM   #9
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Quote:
Originally Posted by skubaru View Post
Hmm, yeah mine is on the passenger side, and it shows back up even if I wipe it off. Gotta do something about the RPM's tho, they're scary low.
I don't think yours is seepage you have more of a puddle. I would keep an eye on your oil level as that's a good amount. You should probably first find the source of that.
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Old 05-08-2012, 09:23 AM   #10
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First, check your gauge again. You aren't below 500 rpm.

Second, I'd check your IACV valve. I'd bet money it is dirty and needs a cleaning, and probably has never been done. Just make sure you buy a new gasket BEFORE removing the valve, as the old one isn't going to go back on.
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Old 05-08-2012, 05:23 PM   #11
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Quote:
Originally Posted by rkramer View Post
First, check your gauge again. You aren't below 500 rpm.

Second, I'd check your IACV valve. I'd bet money it is dirty and needs a cleaning, and probably has never been done. Just make sure you buy a new gasket BEFORE removing the valve, as the old one isn't going to go back on.
Seems like this could be the problem (hopefully) and to I'd have to order the gasket right? Doesn't seem like its something a local auto store would have.
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Old 05-10-2012, 09:00 AM   #12
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Quote:
Originally Posted by skubaru View Post
Seems like this could be the problem (hopefully) and to I'd have to order the gasket right? Doesn't seem like its something a local auto store would have.
Probably have to get it a dealership. I know my '02 started acting up exactly like yours and cleaning the IACV cured it. Its only a matter of time/miles before everyone has that same problem at some point.
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Old 05-10-2012, 08:58 PM   #13
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So the IACV for an 02 2.5rs looks completely different then the one for a wrx, and I can't really take it off a soak it in gas. I used qtips and cleaned out what I could, and got a lot of the black gunk out. Started it up, and same thing, nothing changed. RPMS are still really low. Any other solution besides a new IAC which would be quite costly

EDIT: Mine is just like this http://opposedforces.com/parts/impre...llustration_4/

Took of #7, and cleaned it and the part it bolts up to, is this enough or any other spots that could cause the low RPMs in my case?

Last edited by skubaru; 05-10-2012 at 09:47 PM.
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Old 05-10-2012, 09:46 PM   #14
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It almost looks like a bad power steering pump leak to me. Take a look around the pump itself and the two connections to see if anything is leaking.

Last edited by subi400; 05-10-2012 at 10:08 PM.
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Old 05-10-2012, 10:55 PM   #15
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Awesome, the puddles were nothing more then and over filled power steering tank (previous owner had it all the way up to the cap ) and somewhere along the lines, when the steering wheel was turned all the way to one side, it leaked. Atleast this was a simple fix Thanks a bunch! Now back to the low rpms
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Old 05-11-2012, 03:32 AM   #16
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Quote:
Originally Posted by skubaru View Post
Awesome, the puddles were nothing more then and over filled power steering tank (previous owner had it all the way up to the cap ) and somewhere along the lines, when the steering wheel was turned all the way to one side, it leaked. Atleast this was a simple fix Thanks a bunch! Now back to the low rpms
Well, good! I dealt with a power steering leak a few years ago and so from the picture I was like, yeah looks to be power steering fluid because of where it is. If it was oil, most likely a head gasket problem but it would be a much slower seap though this isn't your problem

Since you got that taken care of, just have to find out why the rpm's get low like they do Do you happen to know when the fuel filter was changed last? It is the little canister just to the left of the washer fluid tank. Should be black or grey.
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Old 05-11-2012, 08:38 PM   #17
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Well, good! I dealt with a power steering leak a few years ago and so from the picture I was like, yeah looks to be power steering fluid because of where it is. If it was oil, most likely a head gasket problem but it would be a much slower seap though this isn't your problem

Since you got that taken care of, just have to find out why the rpm's get low like they do Do you happen to know when the fuel filter was changed last? It is the little canister just to the left of the washer fluid tank. Should be black or grey.
Hmm no idea when it was changed, if at all. Is there a way to check it if it went bad or just buy a new one?
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Old 05-11-2012, 11:48 PM   #18
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Quote:
Originally Posted by skubaru View Post
Hmm no idea when it was changed, if at all. Is there a way to check it if it went bad or just buy a new one?
The fuel filter on your car is a small round canister just to the left of the washer fluid tank. Should be a line going into the filter and one coming out. Does it look fairly new or does it look oldish?
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Old 05-12-2012, 12:36 AM   #19
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Quote:
Originally Posted by subi400 View Post
The fuel filter on your car is a small round canister just to the left of the washer fluid tank. Should be a line going into the filter and one coming out. Does it look fairly new or does it look oldish?
It actually looks sorta new, nice shiny black, took it out of the bracket and I see nothing wrong with it.
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Old 05-12-2012, 12:41 AM   #20
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Quote:
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It actually looks sorta new, nice shiny black, took it out of the bracket and I see nothing wrong with it.
Ok, good Well, there is something causing the kind of low idle though....have to keep searching...
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Old 05-12-2012, 01:06 AM   #21
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yeah, wish I knew what it is. Hopefully not the iacv sensor
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Old 05-12-2012, 08:20 PM   #22
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Hmm came up with another idea, maybe I should sea foam it? Seems like it could help with my low rpms. Can't hurt to try right?

EDIT: Sea foamed it and it does idle a little smoother, you can feel the difference sitting in the car. But the RPM's are still low!!
Also, I dont think it's the sensor because when I started the car w/ the sensor unplugged, the gauge was going all over the place and the car rattled. Plugged the sensor back in and it was steady, just went back to low rpms.

Last edited by skubaru; 05-12-2012 at 11:00 PM.
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Old 05-13-2012, 06:44 PM   #23
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Today I even tried to mess with the TPS, bumped it up a little to around 800-900 rpms, then after turning off the car, it went back to 400.
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Old 05-14-2012, 03:05 PM   #24
Imprezzedwitsubies
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Quote:
Originally Posted by skubaru
Today I even tried to mess with the TPS, bumped it up a little to around 800-900 rpms, then after turning off the car, it went back to 400.
Do you have a scan tool that can read live data? That might help you pin point the problem somewhat.
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Old 05-14-2012, 03:57 PM   #25
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Today I even tried to mess with the TPS, bumped it up a little to around 800-900 rpms, then after turning off the car, it went back to 400.
i'm not sure what it was idling at previously, but i think you might be misreading your tach? from what i gather in the picture you started off the thread with, you are idling at just below 750rpm...maybe 700 rpm?

not sure this is the cause of your concern, but that doesn't seem all that low to me.

of course, i could be wrong... but looking at your gauge, like most cars, it seems that the lowest bold bar is not zero, but actually 500rpm (it should all follow the same "tick marks" as the higher rpms). anything below that bold bar is between 0 and 500.
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