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  #1  
Old 12-31-2007
da lone ranger's Avatar
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p0442 trouble shooting

the check engine light is on and i got this code and it is an EVAP. emissions system leak (small leak)

so any suggestions on what to do will be greatly Appreciated
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Old 12-31-2007
04 EDGE
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do you have a aftermarket locking gas cap?
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Old 12-31-2007
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lol -- gas caps are a major culprit in leaks for sure.

Small leaks can be really hard to find though. Unless you happen to bird dog it somehow, you may need a "smoke test" where chemical smoke is pressurized into the system through the filler neck and you look for where the smoke is coming out.

This requires you to force the vent valve on the cannister shut because it's a normally open valve. The vacuum control valve in the engine compartment is normally closed so you can simply unplug that.

I currently have a small leak with is a problem this way: my EVAP diagnostic monitor won't complete, but the leak is so small it doesn't light the CEL. Very strange. I've done some testing with forcing vacuum on the tank and then forcing both valves closed (just using jumpers) and I still haven't been able to find it.

It's sometimes a problem even for regular service folks to diagnose. I hear lots of stories of people throwing parts at it to fix it which seldom works.
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Old 01-01-2008
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yes i do have a locking gas cap so that might be the problem but the problem didnt happen till a while after i bought the truck. so that might be the problem but who knows
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Old 01-02-2008
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well i changed the gas cap and that doesnt seem to be the problem
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Old 01-02-2008
04 EDGE
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did you clear the codes?

the light may not go out on its own.
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Old 01-04-2008
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no i didnt but its still running junk
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