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Old 09-17-2006, 12:09 PM   #1
gmbwrenchn
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Join Date: Nov 2003
Location: Milwaukee, Wisconsin
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PO440 CODE / 97' Blazer
97' Blazer. 130k miles 4.3ltr. Just got the code PO440. I know it means EVAP EMISSION CONTROL SYSTEM MALFUNTION. Where is the most likely place to start on this problem. I've made no recent repairs lately either. I did a search on the forums and looks like gas cap replacement and vent control valve maybe? Where would you start? Just want to clarify on these possible fixes for my current vehicle. Thanks.
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Old 09-17-2006, 12:58 PM   #2
muddog321
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Re: PO440 CODE / 97' Blazer
Yep, look at this link for info:
http://www.obd-codes.com/trouble_cod...alfunction.php
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Old 09-17-2006, 01:34 PM   #3
gmbwrenchn
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Re: PO440 CODE / 97' Blazer
Sweet...............thanks for the link!
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Old 09-17-2006, 09:29 PM   #4
jmagerl
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Re: PO440 CODE / 97' Blazer
GAs Cap. They just plain wear out after 130k miles. Thats about when mine needed replacing. Its a cheap thing to try before doing anything major.
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