P0440 engine code

2000 BUICK LESABRE
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LESABREOWNER
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Engine Mechanical problem 6 cyl Front Wheel Drive Automatic 61xxx miles

My check engine soon light has been on for a couple weeks. I have a 0440 trouble code. Generally That means a bad gas cap. I've replaced the cap with two others. Then I had the car re-scanned. Still have P0440 code. I've also checked both hoses connected to the EVAP canister, and it seems to be working. It was suggested I take carb cleaner and spray it around my vacuum lines and listen for the engine to rev, thus detecting a vacuum leak. NOTHING. When under the hood, I manually accelerated the engine at the throttle body, and the engine hesitated, almost died, and then recovered. It does the same at the accelerator pedal. HELP!!!!!!!!
Apr 2, 2009 at 2:17 PM
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DOCFIXIT
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Try cleaning the MAF sensor that will cause hesitation and throw the code.
Apr 2, 2009 at 3:35 PM
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TONY SOUSA
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Try replace fuel neck, maybe broken or cracked...
Aug 12, 2017 at 8:40 PM
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STRAILER
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It sounds like you have a bad charcoal canister. I would replace it with a new unit which should fix the problem.

Please let us know what you find.

Cheers, Ken
Aug 14, 2017 at 6:22 PM
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STEVE HARRISON
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It has been suggested to me as replacement of the canister with a new part can be very expensive I opted to use a use unit from a parts yard with lower mileage but still a factory unit, has resolved my particular issue.
Nov 26, 2022 at 6:47 AM
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STRAILER
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Excellent addition to this thread! Please feel free to use 2CarPros anytime!
Nov 26, 2022 at 9:43 AM