Mechanics

F250 EVAP LARGE LEAK CODE

1997 Ford F-250

Engine Performance problem
1997 Ford F250 V8 Two Wheel Drive Automatic 189000 miles

The Pcm is detecting an Evap large leak. I have traced lines and found no faults. I was thinking maybe the IAC was at fault or the PCV valve. Not sure tho. Dont have any tools to test the system.
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Waynecopreacher
April 27, 2010.



Wouldnt be those. Theres a valve on the tank. And then theres a vapor line running up to the charcoal canister. From there to the purge solenoid and then to the manifold.

Best thing to do is get a smoke tester to do it because altho it says large leak. It can be very tiny.

Also did you check the gas cap?

Blackop555
Apr 28, 2010.