14 - Boost Pressure Test

14. Boost Pressure Test





Purpose:
To determine if the engine can develop sufficient boost to obtain specific power.

Recommended Procedure:
Monitor NGS Tester PID MGP and RPM. After the engine is up to operating temperature, find an open section of road and select the best gear to achieve a 2500-3000 rpm acceleration. With the accelerator at wide open throttle, note the highest boost reading while accelerating through the 2500-3000 rpm range. Boost will level out after 3000 rpm. This is best accomplished either climbing a hill or with the vehicle fully loaded.





Alternate Procedure:
Install a T (manufactured locally out of common fittings) into the Manifold Absolute Pressure (MAP) sensor line that comes from the intake manifold. Make sure the MAP sensor is hooked up for this test.

Connect the T to a 0-30 psi gauge that is temporarily installed in the cab. Route the hose so that it is not crimped and does not come in contact with any hot surface.

Possible Causes:
- MAP hose pinched or open
- Leaking intake, hoses or fittings
- Defective turbocharger
- Base engine failure