Charging Pressure Test

Charging pressure is measured while vehicle is being test driven. During road test, also observe engine performance for signs of abnormal operation. Pressure is measured using a suitable gauge connected to the intake manifold. During testing, the actual pressure test must be done as quickly as possible to prevent overheating of the braking system.
1. Connect suitable pressure gauge between intake manifold and pressure switch using a ``T'' connector.
2. Run gauge hose into passenger compartment. Position gauge vertically on instrument panel and ensure that hose is not pinched.
3. Disconnect wiring harness connector to APC solenoid valve.
4. Start engine and warm to operating temperature by driving vehicle, noting vehicle performance.
6. To start test, place manual transmission in 3rd gear or automatic transmission selector in position 1 and operate vehicle at engine speed of 1500 RPM or less.
7. Press accelerator to floor. As engine speed approaches 3000 RPM, apply brakes while holding engine at full throttle. Test must be performed as quickly as possible to avoid excessive heat build-up in brake system. If test must be repeated, drive vehicle 1/2 to 3/4 mi. to allow brakes to cool.
8. Read boost pressure at 3000 RPM with engine under full load. Boost pressure may surge above maximum limit when engine is first accelerated.

9. Gauge reading obtained should be 4.0-4.4 psi.
10. If readings are not within specifications, adjust as necessary.
11. If the pressure readings are within specifications, reconnect the APC solenoid valve and disconnect the pressure gauge.