Well I bought a new car tuesday night and tonight the CEL came on. I borrowed a buddys Code Reader and it gave a P0440 code which is listed as P0440 Evaporative Emission (EVAP) System. Can anyone explain what this is, or what the problem could be and an idea on what it'll cost to have fixed? I feel no difference in power or rough idle or anything out of the normal, it just threw a code....
1997 Sunfire SE
search much? i've posted this three times. in this forum. THIS MONTH.
i wrote: 0440 relates directly to the evaporative emissions system. the parts that it monitors include (from stern to stem): the gas cap, the gas fill neck, the gas tank, the gas tank pressure sensor, the vacuum lines running from the tank to the evap canister, the canister itself, the valve on the canister, the lines from the canister to the purge valve, the purge valve itself, and finally, the line from the purge valve to the intake manifold. 
if any one of these 16 parts is faulty, it could trigger the 0440. the most common place to begin diagnosis is with the gas cap, as if not screwed on tight enough (by yourself or the gas station attendant) -or- if the rubber on the cap has degraded enough to not make a seal, then this code could be thrown. a gas cap should not cost more than $6-$8 at your local parts tore. next, a visual inspection of the lines to see if any are cracked, broken, kinked, or otherwise pinched off/leaking. if, after these inspections have been made and determined to not be the cause of the problem, i wold recommend getting your emissions system smoke tested.the parts after these simple diagnoses can get quite expensive depending on where you get them from, and as such, you'll only want to change the part thats causing the issue.
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I realize this is an old post... and I'm not asking about the 440 code.... I got the 446 code... P0446 Evaporative Emission Control System Vent Control Circuit Malfunction... now from the schematic above I see that it's #12... now on a 95 2.2L where would this control circuit be??? Attached to the canister??
From info list I have I can see that code P0446 means EVAP Canister Vent Blocked.
Just thought maybe this helps.
Do we have a schematic on a ecotec EVAP control?
I have the P0440 code, have replaced the gas cap, and now dont really want to get a smoke test...
Any other suggestions?
Buddy Club Ecotec Cavalier
* More to come *
Jay Corkum wrote:Do we have a schematic on a ecotec EVAP control?
I have the P0440 code, have replaced the gas cap, and now dont really want to get a smoke test...
Any other suggestions?
so you DON'T want to do it the cheaper easier way? just have the shop smoke test it, and find out what the problem is. then fix it yourself. you could easily throw a few hundred dollars at this problem and not get it fixed if you don't know whats wrong.
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