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Old 10-18-2007, 09:17 AM   #1
frederik
Scooby Specialist
 
Member#: 64405
Join Date: Jun 2004
Chapter/Region: E. Canada
Location: St-Georges, QC, Canada
Vehicle:
2003 WRX Sedan
WRB - Cobb Stg 2

Default CEL P0442 (evap small leak) + instable boost

Recently my 03 WRX sedan with AccessPort stage 2 started having boost issues, it seems to happen since the outside temperatures got colder. Yesterday the boost appeared to be even more instable, say between 12 and 18 lbs (AP stg2 should be arount 15.7 I think). That was on the highway. I came to a stop light, started at full throttle for 1st gear and second, let off the gas, and a few seconds later the CEL came on.

Lots of people say check you gas cap, but I always tighten it a lot of clicks and because of the boost problem I feel it is something else. A lot of people here also recommends to check for leaks in the vacuum hoses (the blue T fitting or any other vacuum lines). I guess I have a leak that got bigger recently due to the temperature changes ?

What do you think ?
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Old 10-18-2007, 09:22 AM   #2
fastjim
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Member#: 103810
Join Date: Dec 2005
Chapter/Region: MAIC
Location: Jersey Shore
Vehicle:
05 WRX
Black Pearl

Default

i had a small leak in the evap one time after i got my car back from the body shop after a rear end accident.. dont know if this will help you but behind your right rear (passanger side) tire there is a black box under the car with hoses connected to it. this is your charcol canister and does emission stuff make sure all your hoses are connected to this.. i had the hose on top disconected.. if you can use a lift it would be easier.. or you can just unbolt it and see all the hoses that way its only two bolts 12mm i think.. hope this helps if any
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Old 10-18-2007, 09:36 AM   #3
frederik
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Member#: 64405
Join Date: Jun 2004
Chapter/Region: E. Canada
Location: St-Georges, QC, Canada
Vehicle:
2003 WRX Sedan
WRB - Cobb Stg 2

Default

fastjim : I also read about the canister stuff but did'nt have much details about what to check exactly. Thanks for the additional info about the top tube and unbolting the assembly. I'll check that as well.
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Old 10-18-2007, 01:48 PM   #4
frederik
Scooby Specialist
 
Member#: 64405
Join Date: Jun 2004
Chapter/Region: E. Canada
Location: St-Georges, QC, Canada
Vehicle:
2003 WRX Sedan
WRB - Cobb Stg 2

Default

Anybody think my boost problem is related to the P0442 CEL ?
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Old 10-20-2007, 12:49 PM   #5
frederik
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Member#: 64405
Join Date: Jun 2004
Chapter/Region: E. Canada
Location: St-Georges, QC, Canada
Vehicle:
2003 WRX Sedan
WRB - Cobb Stg 2

Default

I have reset the ECU with the AccessPort Reset ECU function, and the boost is much more stable than before. Can't figure why. It is still going crazy sometimes in 4th gear but the car seems to pull much better and the CEL did'nt come back.

I also had another problem the other morning, after starting up the car, the Low fuel light came on and the fuel gauge dropped from 3/4 to zero in about 30 seconds, and came back to normal after a while, and fuel light came off.

Is there a relation between the fuel gauge problem and the P0442 CEL ?

Thanks
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