1993 Ford E-Series Van Weak canister purge solenoid?

1993 FORD E-SERIES VAN
210,000 MILES • V8 • 2WD • AUTOMATIC
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JMACEY1
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I was told I had a error code 311 and 565 by the dealer before they shut down.
I pulled the Canister Purge solenoid and tested it. off it holds pressure and with 12v+ It opens and passes air. If I put a vacuum on the solenoid by mouth then put 12v+ power to it I can get it to stay closed insted of opening.

does this mean the solenoid is week or bad, and could it be causing the 311 code.
Thank you
May 3, 2010 at 1:43 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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