11-26-2009, 08:59 PM
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#1
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GL Member
Join Date: Mar 2009
Location: Toronto
Posts: 463
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Check engine code P0440
We all know that it means something to do with gas. In my case I figured out it was the infamous gas tank locking cap. Anyway normally I wouldn't just create a thread to rant about it but in the case of my car it's kind of a weird problem. So I had my check engine light on for a while, and I replaced my gas cap with a used one that came out of a Grand Am. The light was off for a couple of days and then came back on. I gave up until like a week ago when I filled up and the engine light disappeared. Usually after filling up it would still be on. Anyway I had no problems until two days ago when I left my key in the 'on' position. The light came back on. So I fixed the cap to turn the light off. It seems that whenever I just turn my car on the light doesn't come on, but if I leave the key in the 'on' position it comes back on. After re locking that gas cap it disappears. What can be causing it ? It only comes back on after leaving keys in the 'on' position. Would getting a brand new replacement cap solve the issue?
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11-26-2009, 09:01 PM
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#2
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636 whp
Join Date: Aug 2006
Location: AZ
Posts: 11,875
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Small EVAP leak... get a real new gas cap and make sure it's tightened, or locate the many other possibilities of an EVAP system leak besides the obvious gas cap.
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11-26-2009, 10:28 PM
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#3
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GL Member
Join Date: Mar 2009
Location: Toronto
Posts: 463
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Quote:
Originally Posted by [ion] C2
Small EVAP leak... get a real new gas cap and make sure it's tightened, or locate the many other possibilities of an EVAP system leak besides the obvious gas cap.
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I know for sure it's the cap, so I guess a new one. Would an AC Delco from eBay work ? |
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11-27-2009, 12:55 AM
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#4
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636 whp
Join Date: Aug 2006
Location: AZ
Posts: 11,875
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Go to AutoZone or whatever local parts places are around you, a gas cap is $6.99 or somethin for the Alero.
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11-27-2009, 11:28 AM
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#5
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GL Member
Join Date: Jan 2007
Location: Michigan
Posts: 252
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i got a locking cap for 15... pm me if you need it ...an ill ship it too you.
__________________
BUILDING A V8 ALERO 2DR 
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11-27-2009, 11:32 AM
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#6
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Hot and Fluffy.
Join Date: Aug 2007
Location: Alberta, Canada
Posts: 1,699
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When filling your tank, when the gas pump stops. Do you keep going?
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11-27-2009, 07:39 PM
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#7
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GL Member
Join Date: Mar 2009
Location: Toronto
Posts: 463
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Quote:
Originally Posted by meadus101
When filling your tank, when the gas pump stops. Do you keep going?
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Yes I do about two-three more pumps, why ? |
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11-28-2009, 12:23 PM
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#8
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V.I.P. Member
Join Date: Jan 2004
Location: northern wisconsin
Posts: 2,428
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it stops for a reason
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11-28-2009, 01:03 PM
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#9
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Now a Ford Traitor.
Join Date: Mar 2008
Location: Greenland
Posts: 6,996
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top offs are bad.... goes back in the EVAP, and eats the hoses....
__________________
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11-28-2009, 01:24 PM
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#10
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Hot and Fluffy.
Join Date: Aug 2007
Location: Alberta, Canada
Posts: 1,699
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On GM vehicles, doing that alone can set off that code. it used to happen on my dad's truck too.
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