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Old 11-05-2016, 12:30 PM
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Question. What is this and why is it making a loud ticking noise? 99 Cherokee Sport.. Annndd go!!
Old 11-05-2016, 02:12 PM
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That's the Duty Cycle Purge Solenoid Valve.


At around 150*F coolant temp it's activated (clicking) to purge fuel vapors from the EVAP charcoal canister and route them to the intake manifold to be burned. The intake sucks the vapors up thru the valve.

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