Canister purge solenoid cycling open/close at engine RPM speed?!
#1
Canister purge solenoid cycling open/close at engine RPM speed?!
I was listening for a tick under my hood and I happen to touch my new canister purge solenoid (old one did nothing when 12v was applied). It was my tick!! It was constantly cycling and would get faster if I revved the engine. Any ideas? The truck is a 1995 F-150 4.9L 5 Speed 2wd. Thanks
#3
#4
Join Date: Nov 2006
Location: Memphis, TN 38135, USA, Earth
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The EEC controls it. At any time when the engine is running, it might be off, on, or pulsing at any frequency. If you put a 12V test light from one of its wires to the other, the clicks should match the light. If so, the EEC is doing it; if not, it's mechanical, probably due to reversed hoses or a damaged CANP.