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85 T/A WS6 Member
Joined: 18 Feb 2004 Posts: 539 Location: Buckley
1985 Pontiac Trans Am
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Posted: Thu Feb 19, 2004 12:49 pm Post subject: OBD II Code |
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My Yukon has been showing a P0440, Evaporator Emission Control System Malfunction.
Any idea ? _________________
1985 Trans Am Recaro Option (AS5)
67,000 miles 5.0 TPI Hi Flow MAF
TPI Airfoil w/Bypass Flowmaster WS6 (.92g)
3:27 Borg Warner Posi K&N Filtration |
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Dewey316 The Lama
Joined: 08 Jan 2004 Posts: 7295 Location: Bringing the tech
1990 Chevrolet Camaro RS
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Posted: Thu Feb 19, 2004 12:50 pm Post subject: |
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not an obd2 expert at all, but i would guess it is something to do with the evap purge operation, i would check there. |
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chevymad Master B
Joined: 11 Jan 2004 Posts: 5473
1987 Pontiac Formula
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Posted: Thu Feb 19, 2004 6:31 pm Post subject: |
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That definition is in different terms then i'm familiar with. But i think i know what it is.. OBDII systems use a vacuum pump that pumps the air out of the gas tank. Then since it knows how much fuel is in the tank, it also knows how much empty space, it measures how long the vacuum holds. If there is any leaks it sets a code. Usually when I get that code someone didnt tighten the gas cap right, or filled the tank with the engine running. You have a scan tool to reset the ecm? OBDII wont reset just by disconnecting the battery. You have to have a tool to erase the code.
Hopefully i'm thinking of the right code. My scan tool and manuals describe it differently(and neither match the other either). |
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85 T/A WS6 Member
Joined: 18 Feb 2004 Posts: 539 Location: Buckley
1985 Pontiac Trans Am
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Posted: Thu Feb 19, 2004 6:40 pm Post subject: |
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You nailed it guys, also if you change grades of gas it will throw this. I can clear it again.
Im also looking for a for a Hypertech Programer, I need to recalibrate the speedo for larger tires and more HP !
I have dumped so much $$ into the truck, my poor lil T/A is crying under its blanky !
The K&N FIPK in addition to the Force II Catack is making me dizzy
ttyl
Don |
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