Start at the gas cap. If it's not on tight, not sealed tight, or the
o-ring has dried out, these codes can be triggered.
Jon wrote:
> About two weeks ago, I got a P0442 code (Small leak detected in the
> evaporative purge system) reset the PCM and nothing, truck ran fine. This
> morning I got P0455 (Large (gross) leak detected in the evaporative purge
> system.). What all is involved in the EVAP system? I've checked the gas
> cap gasket and it's still soft plyable and looks fine. Any other ideas?
>
> P.S. the truck is still running fine.
>
> --
> Jon Slavic
> 2000 CC Intense Blue 4x4 4.7L V8
> jons@laserdrive.com
>
>
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