Idle problem!! Please Help!! - Subaru WRX Forum
 
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post #1 of 8 Old 12-02-2010, 07:35 PM Thread Starter
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Idle problem!! Please Help!!

Hi everyone, Im new to the Subaru family, I purchased a 03 WRX wagon about 4 months ago and I love everything about it! The engine is stock, except for a Forge BOV and a catback exhaust. But there is one problem that I have been having since I bought it, my wrx has a rough idle when starting and when I stop at traffic lights. I had it checked out by the guys at a Subaru dealer and they said it might be the MAF sensor, so they unplugged it and it ran fine without it. Now I bought a new MAF sensor and the idle improved a bit but it still has an inconsistent idle, fluctuating between 1000 and 500 RPMs.

Does anyone know what may be causing the rough idle?

And why does it idle better without the MAF sensor?

Im not sure if it has been tuned, how do I check that?

I would appreciate any help!!
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post #2 of 8 Old 12-02-2010, 10:00 PM
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Dude its the BOV. I'm assuming its a full-atmospheric bov and if so that's exactly the problem. They r known to cause idle problems. Get a recirculating or even a 50/50 bov and your problems will be solved.

Mike
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post #3 of 8 Old 12-03-2010, 01:05 AM Thread Starter
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Alright, I have the stock BOV so I'll replace it with that for now. I'll do that tomorrow and hopefully all will be solved.
Thanks mfarnham!
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post #4 of 8 Old 12-03-2010, 09:59 AM
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Yeah let me know how it turns out.

Mike
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post #5 of 8 Old 12-03-2010, 10:11 AM
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pzr2874 is known to be trustworthy and helpful pzr2874 is known to be trustworthy and helpful
Reset the ECU also after switching it out.

Paul
2002 WRX Sold
2007 WRX Sold
2007 STi totaled
2007 Foz XT sold
2007 MS3
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post #6 of 8 Old 12-04-2010, 01:51 AM Thread Starter
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So I installed the stock recirulating valve and my idle problem has been fixed, but the vacuum pressure fluctuates just slightly. I think I might have a vacuum leak, how do I troubleshoot that?
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post #7 of 8 Old 12-04-2010, 08:18 AM
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If you have an air compressor, you can buy a cap that attaches to your intake, and you can pressurized the system with your car off to listen for leaks.

Mike
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post #8 of 8 Old 12-04-2010, 01:08 PM Thread Starter
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Thanks, I'll have to do that when I get a hold of an air compressor.
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