trouble code 0440 - 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 06-09-2006, 12:41 AM   #1
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Default trouble code 0440

my engine light came on and so i took it to auto zone for the guy to scan it and it came up 0440, he then cleared it. The light came back on a few days later, so i did some reading on here, and changed my gas cap. But now i do not know how to clear the code without the scan tool...i tried pulling fuses, unplugging battery cables. I also did some searching on my evap system, and i noticed one of the lines pulls right off of the thing it is plugged into.

here is someone elses picture that shows what i mean.

http://www.bonnevilleclub.com/forum/...p0440&start=40

this thread, page 3, lash'* second picture, the top line just under his pliars, pulls right off what its attached to, but the bottom line does not, could that be the problem???
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Old 06-09-2006, 07:28 AM   #2
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HI...I'm not sure where you are talking about A pillars. Lash'* problem turned out to be a split or bad piece of vacuum tubing.

Please start off with checking and replacing all tubing on your evap system that looks questionable.
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Old 06-09-2006, 07:33 AM   #3
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Quote:
Originally Posted by BillBoost37
HI...I'm not sure where you are talking about A pillars. Lash'* problem turned out to be a split or bad piece of vacuum tubing.

Please start off with checking and replacing all tubing on your evap system that looks questionable.
He meant pliers. But yes, do check for split or severely cracked hoses. One little crack can make a BIG difference.
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Old 06-09-2006, 09:02 AM   #4
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Sorry... 2nd night of only 3 hours sleep and a little fun messing around taking pics of a "light sleeping" Bandit at my place.

My bad.

Yup.. go through all the vac hoses, not just that one. There are also a couple under the airbox that may be hard to see w/o removing it.
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Old 06-09-2006, 09:25 AM   #5
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The charcoal cannister is a prime suspect (the vacuum connections to it) if the gas cap has been ruled out.
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