Pickup 2WD L4-155 2555cc 2.6L SOHC VIN E 2-bbl (1988)
Altitude Compensator: Testing and Inspection
Check Valve
Fig. 140 Testing the check valve
1.
Mark the hoses connected to the check valve and remove it from the vehicle.
2.
Connect a hand vacuum pump to the check valve, Fig. 140 and verify that when the vacuum pump is connected to the dark blue side of the check
valve vacuum leaks and when connected to the white side of the check valve vacuum holds.