The idle shutoff valve blocks, when the ignition is turned off, the access of the combustible mixture to the mixing chamber. If the lotto valve is defective, the engine will be difficult to start.
Switch on the ignition, remove and put on the valve wiring harness several times. Clicks should be heard.
The valve can also be removed and checked.
Remove the valve and lean against the ground.
Connect the positive wiring to the valve.
The magnetic core should work (click). Otherwise, replace the valve or check the wiring.
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