Cold Start Valve (All Models Except VANAGON)

Engine temperature must be below 85°F (30°C). Disconnect cold start valve attaching screws and remove valve with harness connector and fuel line attached.
Remove ignition coil secondary wire and jumper to ground. Attach metal housing of cold start valve to ground. Direct cold start valve nozzle into a clean container. See Fig 1 . Have assistant turn ignition switch to START position, while observing cold start valve spray pattern.
The valve should deliver a consistent cone-shaped pattern until the thermo time switch interrupts fuel flow. Ensure valve does not leak after fuel flow stops. If spray pattern is uneven or inconsistent, check for plugged or defective cold start valve. If valve does not function, proceed to THERMO TIME SWITCH.

Fig 1: Testing Typical Cold Start Valve

Courtesy of VOLKSWAGEN UNITED STATES, INC.

NOTE: On AFC-Digifant II System, cold start valve is not used. Cold starts are controlled by ECU.