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Old 05-18-2013, 05:13 PM   #1
nismopowerdqg
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Member#: 312580
Join Date: Mar 2012
Chapter/Region: MAIC
Location: Richmond, VA
Vehicle:
2010 WRX SWP@310/334
Cobb/Torqued Performance

Default weird idle

I have. 2010 wrx, first wrx ive owned with the drive by wire system. Ive noticed my idle hangs at 1500 rpms sometimes after i let off the gas and then sometimes it drops to 400 rpms like its gonna cut off and bumps up to normal idle. Only mods are a k&n drop in filter(there when i bought it), nameless exhaust, prosport boost gauge. Any ideas? This normal for this car? I have an appointment tomorrow to get the car looked over at subaru. Just wanted your opinions. Vaccume reads at -20 at idle and about -18 when AC is on.
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Old 05-18-2013, 06:45 PM   #2
nismopowerdqg
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Cobb/Torqued Performance

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Quick update-

changed the filter to a STP filter (seems very similar to a Subaru OEM filter), only one the parts store had, car seems to drive a lot smoother and picks up better..kinda weird. also i went back through all my vacuum lines for my boost gauge and snugged them up a bit more and re zip tied the ends. Gauges reads -21 or -20 at idle and peaks at 15 psi of boost. Just seems to idle funny. no CEL's though.
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Old 05-22-2013, 12:41 AM   #3
karmaSRT
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Satin White Pearl

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We're you getting misfire codes when idling rough, I'm having a similar problem with my 10 sedan from stock to now stage 2 it idles rough as hell, changed the plugs and still does it. Don't think it has a boost leak because it's inconsistent, some days ill have tons of trouble with it and others it's fine. Pm me if you have any ideas
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Old 05-22-2013, 07:31 AM   #4
dstroy
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Did both of you already clean your MAF/make sure the o-ring isn't damaged?
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Old 05-22-2013, 09:48 AM   #5
tuzzio
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A leaking bov can do this.
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Old 05-22-2013, 03:59 PM   #6
eronenris
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it is completely normal, there are multiple posts about this issue. it has to do with the way subaru has tuned the ecu for emissions. the only known fix at this time (to my knowledge) is to get an AP and turn up your idle RPM by 100-200. thats what me and many others have done and it fixed the problem every time. Good luck
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Old 05-22-2013, 06:57 PM   #7
kabz
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If you have your ac on, the ecu seems like it struggles to keep it running occasionally. Especially pulling up to lights etc.
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Old 05-22-2013, 09:45 PM   #8
cbazq271
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Also, When using a K&N filter, there has been some problems mentioned about weird idling. The cause is usually from over oiling the filter element. The extra oil drips off and is sucked into the intake pipe, getting the MAF sensor dirty, causing the idle to get messed up. Also some say A K&N filter lets to much dirt through the filter causing a dirty MAF. Not sure if that's true, just some people say that.
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Old 05-22-2013, 10:14 PM   #9
karmaSRT
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Satin White Pearl

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Quote:
Originally Posted by eronenris View Post
it is completely normal, there are multiple posts about this issue. it has to do with the way subaru has tuned the ecu for emissions. the only known fix at this time (to my knowledge) is to get an AP and turn up your idle RPM by 100-200. thats what me and many others have done and it fixed the problem every time. Good luck
I have an ap and thought I tried this but ill mess with it again and see what happens
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Old 05-22-2013, 10:23 PM   #10
pauli133
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Quote:
Originally Posted by kabz View Post
If you have your ac on, the ecu seems like it struggles to keep it running occasionally. Especially pulling up to lights etc.
yep. "He stepped on the clutch - time to fall on my face!"

Heaven forbid it's a humid day...
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