1997 Ford F-250 EVAP large leak code

WAYNECOPREACHER

MEMBER
1997 FORD F-250
V8
2WD
AUTOMATIC
189,000 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.

Tuesday, April 27th, 2010 AT 10:02 PM

1 Reply

BLACKOP555

MECHANIC
10,371 POSTS

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?