Pickup 2WD L4-2.3L (4ZD1) (1988)
![background image](/isuzu/pickup_2wd/l4-2.3l_(4zd1)/Page-330001.png)
Mixture Control Valve: Testing and Inspection
Disconnect and plug vacuum line from valve. With engine idling, open throttle completely and release quickly. If valve is operating properly, air will
flow out for a few seconds. If air continues to flow out for more than 5 seconds, replace valve.