Electromagnetic valve of the variable valve timing system (Chevrolet Tahoe 2)

Caution: Do not supply 12V from a separate power source to the solenoid valve.

1. Inspect the valve, look for:

• damage to the wiring connector;
• accumulation of dirt in the undercut area near the pin;
• oil sludge deposits on the pin which may cause the pin to stick and/or reduce its stroke.

2. Turn the solenoid valve with the pin facing up and measure the amount (a) of pin protrusion. Record the result.



3. Turn the valve over with the pin facing down and measure the axle protrusion again.



4. Calculate the pin stroke: the pin stroke should be 3.0-5.5 mm. If not, replace the solenoid valve assembly.

(The original article can be found on the resource «ChevyMan.ru»)