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Old 02-14-2013, 02:35 PM   #1
Syrius78
Scooby Newbie
 
Member#: 267996
Join Date: Dec 2010
Chapter/Region: E. Canada
Location: Near Montréal, Québec
Vehicle:
2011 Wrx
Rallye blue

Default Weird problem

Sorry for the long post and for my English.

It happen to me last week and i find it weird. If it's not on the good section, please, change it.

I own a 11 wrx hatch stage 2 with a protune at Lachute Performance for the last year.
Last week, it was very cold and i was returning from a ski trip. 10 minute before arriving at home, i did a moderate push to enter the last highway. I was at about 5500 rpm in second gear. I this moment, i heard a pssuut sound comming for the engine and a powerfull Knock. My head was going foward like when hard braking. At the same moment, the cel light, traction control light went on and cruise is flashing. I know some just happen. So i drive carefully the rest of the way, without going over 3000rpm.

At home, i plug my Accessport and it show problem with turbo, wastegate and solenoid (can't remember and number). So i was crying alone and shut the car and start researching. I read that it cold either a very major problem, like turbo blown off or a misfire. Next day, i called Lachute Performance and the guy explain to me the same thing. Buy he add that because of the cold, the misfire was the most probable thing. I decided to test it myself. I uninstall the Accessport and restart the engine. No cel light. I did drive a bit with it and nothing happen. I did go to the dealer and they told me the same thing but they can check it with a 2-3 hour of work. But the guy add and the ecu should protect everything. If no cel light, should be ok. If it happen again, go to them. Fine, i did that.

Next day, i did drive a little harder just to try it. Try at 3500 rpm, nothing, 4000, the same, 5500 same, wot no problem. So i'm thinking that i should be fine. My dad suggest this may be bad fuel. The gas station hasn't the best reputation around, so maybe. I did reinstall the AP, and try the cobb stage 2 93 octane map with a full 94 gas tank. Try everything else, and perfect all the way. Fewww.

I did notice a big change though. My butt dyno say that the car is powerfull, and fun with the 93 map. But the car fuel comsumption tell me something i'm not used to. A way better fuel milage. No idea in MPG, but in L/100km it went from 11 to 9.

When i drive on cruise control, i'm used to see 10,5-12 L/100km. Depending of Wind and everything. Now for the exact same road, with about the same temperature, it show 8,0-9,5. Even with the price of the 94, it cost less to run.

I would like commentary for my course of action with the cel code and for the mpg.
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Old 02-14-2013, 06:03 PM   #2
blue sedan
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Member#: 311622
Join Date: Feb 2012
Chapter/Region: Tri-State
Location: Pa.
Vehicle:
2010 WRX STG 2
WRB

Default

Overboost due to cold temps.
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Old 02-14-2013, 06:05 PM   #3
Spenk
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Member#: 7164
Join Date: Jun 2001
Location: Arizona Bay
Vehicle:
2000 Miata LS
Evo Orange Mica (1/644)

Default

^^^^^^^^^^^^^^^likely this, but it should have tripped a CEL...unless your tuner disabled it.

Cold ambient temps don't cause misfires.
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Old 02-14-2013, 09:10 PM   #4
Syrius78
Scooby Newbie
 
Member#: 267996
Join Date: Dec 2010
Chapter/Region: E. Canada
Location: Near Montréal, Québec
Vehicle:
2011 Wrx
Rallye blue

Default

Quote:
Originally Posted by Spenk View Post
^^^^^^^^^^^^^^^likely this, but it should have tripped a CEL...unless your tuner disabled it.

Cold ambient temps don't cause misfires.
Maybe it was not a misfire, maybe just the Ecu that cut the turbo.

Thanks for the input
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