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Guest Message by DevFuse

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2006 Legacy GT 2.5 misfire issue

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6 replies to this topic

#1 MAmstutz



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Posted 22 November 2013 - 06:11 PM

I have done a lot of reading and research on the issue, and I'm not seeing anyone with the exact issue I am having.


I have had one problem after another with my Legacy with 123k on it. I bought the car and shortly after, had a slightly rough idle from a minor misfire. the issue increased and I am now stalling out when the car is in drive at a stop sign. I was getting 3 misfire codes, and an EGR Temp Sensor code. In an effort to see if the temp sensor was the cause of the issue, or if the issue was the sensor, or something else, I read on a WRX forum that said you can unplug the sensor and connect a 2.4k ohm resistor to make the ECU thing the sensor is working correctly. now I have no EGR code, but it's still throwing misfire codes on 3 different cylinders and runs just as badly as it did before. I already tried replacing the plugs with the good NGK plugs (which I was told do NOT require gapping, and can be damaged if I attempt to gap them... right?). I have no coolant in my oil. I have lost about 4 MPG in fuel economy. the car is running super rich. it also runs smoother when the car is cold. the misfires go away once I get above 2k RPM or so.


Before I put a resistor in it, on 3 different occasions the car completely stalled out on me at the bottom of a large hill near where I live. it happened right as the engine started to warm up. it would crank and crank, and eventually start, but if I would give it any gas at all, it would die again. park the car. let it sit for 2 minutes, start it, and it's fine (apart from the usual misfiring). 


May also be helpful to add that I blew the turbo and had to replace the center section on the turbo 2-3 months ago. since then I have a "squirrel" in my turbo any time I generate boost. I have yet to take it apart and investigate what the issue is there.


Thanks in advance for your help!

#2 Fairtax4me



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Posted 22 November 2013 - 06:47 PM

Possible this is being caused by a loose intake hose on the turbo or throttle body.

Anytime you have an EGR code you should remove the EGR valve and see if it needs to be cleaned.
Was the EGR temp code saying the temp was too high? If so that would indicate the EGR valve is stuck open, which will cause idle problems and stalling.

Your "squirrel" could be back pressure in the exhaust being forced past the partially stuck open EGR valve, making a whistling noise in the process.

#3 Caboobaroo


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Posted 23 November 2013 - 12:13 AM

Has the timing belt been changed?

#4 Haight


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Posted 23 November 2013 - 11:22 AM

You will find much better information on your model at legacygt.com

#5 ivans imports

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Posted 23 November 2013 - 11:27 AM

Two things start with HP feul pump have been finding the screen on feul pump pluging and pumps making low output [ carter hp wrx pump p74152hp ] this fixed the last two mising stumbeling wrxs. Also o2 senser mabee shorted ritch or valves to tight

#6 ShawnW


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Posted 07 May 2014 - 12:29 PM

You will find much better information on your model at legacygt.com

Please don't send people to another forum for information.  That is a great forum but we have really good info here as well.  If you want to link to a specific relevant thread that is fine. 

#7 Haight


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Posted 08 May 2014 - 01:02 PM

Fair enough.

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