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Help! Trouble Code P0442: Evaporative Emission Control


Old 07-16-2002, 07:22 PM
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Exclamation Help! Trouble Code P0442: Evaporative Emission Control

This morning after about 5 minutes of driving my truck started to stumble badly. During normal driving (coasting with the foot steady) while going up a incline, it will stumble like it's missing. At WOT, it seems to be fine. It also has a bad idle that comes and goes every few seconds, even in PARK. I scanned the computer and came up with a code: P0442 Evaporative Emmission Control System Leak Detected (Small Leak). I swapped gas caps but that didn't work. Any ideas? Last night, I did fill up the tank with gas, so could I have bad gas?
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Old 07-16-2002, 08:48 PM
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Mine showed this code and it was a small vacume leak over behind the battery (in front of the computer). My be it effected the egr valve. Try checking both.
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Old 08-22-2004, 10:07 AM
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Angry interested in solution

I have the same problem with my truck. Exactly the same problem. Replaced gas cap, no solution. Added Techron, Helped but came back. Sometimes it run's ok for a while but then it goes to hell in a hand-basket and run's like it is mis-firing. (which it probably is) The EVAP Emission error relates to the Charcoal Canister, does anyone think it could be this? I am at a loss here. If Jupiterak is still out there, you had the same symptoms. Anything help fix it?
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Old 08-22-2004, 12:33 PM
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Old 07-25-2011, 07:43 PM
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code P0442

I have the same problem with my truck. I read an article on it that states this is the hardest code to diagnose cause it can be a small leak anywhere in the system. The best way to find out where the leak is, is to take it to a shop that has a smoke machine. They pump smoke in and check the entire system to see where the smoke is coming out. I may have to do this, but I'm oing to check for any cracked hoses leading to the purge valve and charcoal canister. There was a small video on this in You Tube by Wells Vechicle Electronics.
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