car has the P0440 code. What is the most likely cause?

2001 PONTIAC GRAND PRIX
180,000 MILES
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MATT MILICIC
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I have been struggling with getting this car inspected. Started off with an EGR code which has been repaired. Now it is showing only the P0440 code but it registers tice after the EVAP monitor is satisfied. The shop has had it for a couple of weeks but has not cleared this issue up and they have not shared what they actually did on this code with me.
Dec 27, 2011 at 9:42 PM
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DOCFIXIT
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Shop maynot have equipment to perform testing. Need EVAP pressure and purge station and Ultrasonic leak detector
Dec 27, 2011 at 9:48 PM
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MATT MILICIC
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where can I find a diagram showing the location of the EVAP system parts?
Dec 28, 2011 at 1:35 PM
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DOCFIXIT
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Can only find generic one 440 is LARGE leak so smoke test should show problem. has gas cap and filler neck been checked out?
Dec 28, 2011 at 9:33 PM
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MATT MILICIC
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I replaced the gas cap already. What do I need to look for on the filler neck? How do I do the smoke test?
Dec 28, 2011 at 9:43 PM
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DOCFIXIT
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Find shop with equipment test can be done for @$50-80
Dec 28, 2011 at 9:44 PM
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MATT MILICIC
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Can I test the filler neck out of the vehicle and what am I looking for to see if it is bad?
Jan 10, 2012 at 3:07 PM