Opening Pressure Test
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 1998 GMC Suburban, 1998 GMC Pickup, 1998 GMC Cab & Chassis, 1998 GMC C3500 HD, and 1998 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
- Open tester shutoff valve 1/4 turn from closed position. Slowly depress tester lever and observe gauge. Note pressure at which needle of pressure gauge stops. Some injector nozzles may pop while other injector nozzles may drip (this is not a leak).
- Injector opening pressure should not fall to less than 1500 psi (105 kg/cm2 ). Replace any injector nozzle where measurement does not meet lowest acceptable pressure. Release tester pressure.