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Old 12-27-2014, 01:50 AM   #1
grumpywagon
Scooby Newbie
 
Member#: 402520
Join Date: Sep 2014
Chapter/Region: BAIC
Location: moved 6 times this year. CA.
Vehicle:
2005 WRX
sliver/black/blue

Default valve issue perhaps?

Hey all, so Christmas day I'm driving home from work. I get into boost a bit and a vacuum line to the BPV pops off, so I stop and zip tie it. I get back on the road, and to test the fix I go wide open. I heard nothing out of the ordinary, but suddenly, the car loses power, bogs and shakes, and I get a flashing CEL and a code for Cylinder 3 misfire. When I'm idling the car shakes violently and misses. I see no smoke at all. So I get towed home and check compression in that cylinder and get ZERO. Not even a slight jump from the needle. the plug for cylinder 3 was slightly fouled and had some debris on it. Possibly carbon or metal shavings i guess. They were tiny and grainy. Not good. I check the remaining cylinders and they appear to be in good shape. Do I have a stuck or broken valve? I've been wanting to build the motor for some time anyway, so I'm not too pissed. I just want to know what's wrong before I dig too deep. Any thoughts are appreciated.

Cliffs:
05 wrx wagon 2.0L on E85, motor has 30k on it.
Tomei M7760 turbo
ID 1000's
Walbro pump
One step colder plugs
STi TMIC
Tomei inlet
Cobb SF intake
Grimmspeed EBCS
Mishimoto aluminum rad.
Samco hoses
Invidia 3 inch catless turbo back
Grimmspeed Uppipe
Amongst other things.
Tuned by Eric @ torqued performance.

Wideband showed a perfect AF ratio while accelerating, and at idle afterward before shutdown.

2 weeks prior, I went full throttle on an open road and experienced a vibrating, almost fuel cutting sensation at 125 mph and the car lost power significantly. I could hear the Internal wastegate moving vigorously. (Sounded like an EWG) Then idle was interestingly slightly rougher than normal until now.

Car held full boost fine.

Slightly difficult to start after incident

Injectors have 2000 miles on them.

Thanks!
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Old 12-29-2014, 10:22 PM   #2
michaelwood
Scooby Newbie
 
Member#: 396556
Join Date: Jul 2014
Chapter/Region: South East
Vehicle:
2004 WRX
black

Default

I would take your diagnosing a step further than you already have. If you put your bad cylinder at top dead center compression stroke, or anywhere both the intake and exhaust valves are closed, you can do a leak down test. While doing the leak down test, you will probably be loosing all of your air. I'd see where it's going. You may have to remove some intake piping, or some exhaust piping, but you'll quickly be able to find hear the problem when you do. If you hear noise from the intake make sure it's not air coming out of your crank case vent lines, I'd listen at least from the turbo inlet. If air rushes through your crank case vent lines the problem will likely need a bottom end engine tear down to fix!

Good luck
Mike W.
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Old 12-30-2014, 10:51 PM   #3
grumpywagon
Scooby Newbie
 
Member#: 402520
Join Date: Sep 2014
Chapter/Region: BAIC
Location: moved 6 times this year. CA.
Vehicle:
2005 WRX
sliver/black/blue

Default

Thanks for the reply! I figured as much. I'm not afraid of a teardown really, and I have the money stashed for a built bottom end. I'm really actually hoping its just that so I can do my bottom end build while I'm at it.
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Old 01-18-2015, 04:44 AM   #4
grumpywagon
Scooby Newbie
 
Member#: 402520
Join Date: Sep 2014
Chapter/Region: BAIC
Location: moved 6 times this year. CA.
Vehicle:
2005 WRX
sliver/black/blue

Default

Welp...blew it up. Bottom end is toast as well as the heads. Praying the turbo isn't a goner as well. Copious metal shavings in the heads and oil aren't looking promising. Its a tomei 7760 with 900 miles on it. Going to meticulously clean it and flush it and hope for the best I suppose. Will be replacing with new heads and a rallispec short block. Wish me luck.
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