CODE 0440 - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-12-2002, 09:51 PM   #11
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That'* what i'm trying to say , there is no OPENING to the canister. It'* completely sealed off!
The canister is inside of a basket and the basket has a hole on the bottom . But that'* it the canister is closed off! There is a filter in the purge valve and that'* super clean but I changed it anyway , I don't want to break it open but it looks like it was welded shut or glue together!
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Old 10-12-2002, 09:58 PM   #12
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Well if THAT'* the case then! I would check for cracked or broken vacuum lines.
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Old 10-12-2002, 10:00 PM   #13
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And check that solonoid. Get back to us with the results. I'm curious about this one.
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Old 10-12-2002, 10:26 PM   #14
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Here'* the list of GM Dianostic Trouble Codes that deal with the EVAP System:

DTC P0420 Catalyst System Low Efficiency
DTC P0421 Warm Up Catalyst Efficiency Below Threshold (Bank 1)
DTC P0422 Catalyst System Low Efficiency Bank 1
DTC P0423 Heated Catalyst Efficiency Below Threshold (Bank 1)
DTC P0424 Heated Catalyst Temperature Below Threshold (Bank 1)
DTC P0430 Catalyst System Low Efficiency Bank 2
DTC P0431 Warm Up Catalyst Efficiency Below Threshold (Bank 2)
DTC P0432 Catalyst System Low Efficiency Bank 2
DTC P0433 Heated Catalyst Efficiency Below Threshold (Bank 2)
DTC P0434 Heated Catalyst Temperature Below Threshold (Bank 2)
DTC P0440 Evaporative Emission (EVAP) System
DTC P0441 Evaporative Emission Control System Incorrect Purge Flow
DTC P0442 Evaporative Emission (EVAP) System Small Leak Detected
DTC P0443 EVAP Purge Solenoid Valve 1 Control CKT
DTC P0444 Evaporative Emission Control System Purge Control Valve Circuit Open
DTC P0445 Evaporative Emission Control System Purge Control Valve Circuit Shorted
DTC P0446 EVAP Vent Solenoid Valve Control System
DTC P0447 Evaporative Emission Control System Vent Control Circuit Open
DTC P0448 Evaporative Emission Control System Vent Control Circuit Shorted
DTC P0449 Evaporative Emission (EVAP) Vent Solenoid Control Circuit
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Old 10-12-2002, 10:30 PM   #15
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Never! That why I think it'* a cracked vacuum hose or something!
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Old 10-12-2002, 10:46 PM   #16
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Nope. But I've got low miles. Al, I agree......I tried to steer towards cracked lines earlier in this thread. I bet it'* bonehead simple. He'll have good news tomorrow.
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Old 10-13-2002, 12:49 AM   #17
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So far I have checked the lines , perfect , but I changed them any way just to prevent future problems. I need to get a price for the canister and purge valve> It'* it'* cheap enough I'll get it any way .
I also did the code thing again still 440 nothing else . These are usually the problems that you can fix with new plugs, wire and oxygen sensors cause that will clean the air a little better and hide the real problem , but I wanna replace all that **** any way. I changed that stuff 2k ao but I'm sure I'll be happier the whole system is up to date plans for tommorrow are to get all new vaccum lines then do the check on all the sensors . I might just take out the engine light for now cause it drives me CRAZY!!! I'll also try disconnecting the batt tommorrow but not sure if when the system relearns it will think the problem is normal.

BY THE WAY The way you guys are posting make this look like the best message board around , you guys are great thanks for the advice and time

surrounded in yellow light
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Old 10-13-2002, 12:55 AM   #18
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Hey, I don't think plugs and the O2 are the problem. If they need it anyway, go ahead, you'll be glad you did, but I'd check that SV on the canister like I mentioned earlier. We were talking after you left, and we're thinking it'* something so stupidly simple, we're all overlooking it. You have a good one for all of us
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Old 10-13-2002, 01:01 AM   #19
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This is why I lived in upstate PA there is no emissions up there!!!
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Old 10-13-2002, 01:08 AM   #20
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Of course there are, you bozo! Just look under your hood! DUH!

Sorry. I'm starting to sound like Drifter.
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