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Old 04-28-2013, 02:28 AM   #1
karmaSRT
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Satin White Pearl

Default Rough idle 2010 wrx

Back ground I am not new to the wrx I owned a decently built bugeye for about 3 years then got my 2010 wrx a few months ago. I got it used from a dealer in my town with about 14k miles, the dealer got it in trade in and it had a few mods, such as a turbo xs full recirc bov Megan racing axlebacks, walboro 255 and ngk one step colder plugs. I knew after hearing that, that the car was most likely stage two and then taken back to close to stock. I didn't mind because I planned on building it.

Since buying it I have taken it two stage two on the ap. but anyways enough babbling since day one the car has rough idled really bad, almost like it has a bad boost leak. But I know it's not that the Subaru dealer said it could be because of the fuel pump or plugs but I'm not familiar enough with the ngk plugs to know or not.

PROBLEM- when I sit at idle to long ie red light or warm up it rough idles and throws misfire codes on all cylinders and I have to flash it off. Other then that the car pulls hard and runs strong.

I know this thread is probably confusing and typed terribly but I'm drunk and tired and want answers lol. Any help would be appreciated
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Old 04-29-2013, 02:05 AM   #2
currymaciel
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Im no expert by any means, but maybe you overlooked it. Ive got a 2010 and just added a gfb respons bov. I had issues with my idle, it would dip down low when i came to a stop and never stayed steady. I started to adjust the bov and now i see no issues.

And +1 for your last sentance...me to. Lol
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Old 04-29-2013, 08:27 AM   #3
Wrexflex
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I had this problem awhile back. Turns out for me, the gasket on my BPV wasn't sealing properly all the way around. A lot of ppl have this same problem, but it is because of the IC to TB hose. Those little rubber end caps seems to pop off fairly easily. I would start in these areas
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Old 04-30-2013, 11:22 AM   #4
karmaSRT
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Thanks for the input guys it is possible it's something with by bov I have the txs full recirc valve but may try a gfb
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Old 04-30-2013, 12:48 PM   #5
Groundup
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Very well could be your bpv leaking, so common.
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Old 05-01-2013, 09:52 PM   #6
karmaSRT
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Quote:
Originally Posted by Groundup View Post
Very well could be your bpv leaking, so common.
Going to have to check it for tightness and look at a new gasket I have a feelings it's that I changed the plugs out and still having the issue
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Old 05-03-2013, 01:57 PM   #7
Chowza
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Well what did u find?

I just installed my TGV deletes and having same problem.
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Old 05-03-2013, 02:47 PM   #8
Mr Wrex
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This is common when you have a loose boost hose somewhere or a leaky BPV/TMIC coupling. Sometimes you will also get a misfire code, but I guess you didn't.

FYI, one step colder plugs should only be used when running another 100whp over stock... shame on you
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Old 05-03-2013, 08:51 PM   #9
SlimJim8804
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Boost leak test? That'd be a good first step, then toss proper heat range plugs in it, just as a measure.
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Old 05-10-2013, 09:25 PM   #10
karmaSRT
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Quote:
Originally Posted by Mr Wrex View Post
This is common when you have a loose boost hose somewhere or a leaky BPV/TMIC coupling. Sometimes you will also get a misfire code, but I guess you didn't.

FYI, one step colder plugs should only be used when running another 100whp over stock... shame on you
I replaced the plugs and I didn't install them
The previous owner did I've been around long enough to know that . Gotta be a boost leak somewhere near the bypass valve now to figure where it's at.
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Old 05-13-2013, 10:56 AM   #11
dpenn
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I would check this thread and your intake manifold gaskets...
I had a similar problem, bad idle and running rich under boost (only knew bc of my wideband...otherwise ran great...

http://forums.nasioc.com/forums/show....php?t=2299482
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Old 05-13-2013, 11:28 AM   #12
BeastianSTI
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I would get a smoke test done. U get misfires on al 4 cylinders at once? Post some data logs brother!
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Old 05-22-2013, 12:53 AM   #13
karmaSRT
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Still trying to source the problem when I have time, just wanted to note that I also have trouble starting the car unless I let the fuel pump finish, if I try to start it as soon as I put the key in it won't start. Idk if that helps anyone give me a better idea but at this point I just need to try and find a solution.

Thanks for all the replys I'm listening I just don't have a ton of time or experience to do certain things yet, I'd like to just drop my car off at Iag but right now it's my only source of transportation
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Old 01-16-2014, 11:27 AM   #14
Concretebone
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Hey is this problem only when warming up in semi cold weather... If so it's the intake manifold gasket, the plastic manifold has an inadequate gasket o-ring seal and I replaced my 08 wrx seal and it's fine now! Hope this helps
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Old 01-16-2014, 06:22 PM   #15
Hoon Goon
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09+ already have the updated thicker gaskets. Boost leak test will show the way if it is indeed a leak.
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