Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1984VALUE VAN P3500, 5.7 M, AUTOMATIC, 400/M40REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 4 (POWER STEERING GENERAL SERVICING)TESTINGPRESSURE TEST
1984 GMC Value Van P3500, 5.7 M, Automatic, 400/M40
Pressure Test
1984 GMC Value Van P3500, 5.7 M, Automatic, 400/M40SECTION Pressure Test
WARNING: This page does not describe the selected car, but rather 24 other vehicles, including the 1987 Jeep Wrangler, 1987 Jeep Wagoneer, 1987 Jeep Pickup, 1987 Jeep Grand Wagoneer, and 1987 Jeep Comanche. However, it is still accessible from the selected car via links, so may be relevant.
- Note pressure reading with valve open and engine idling. Pressure should be 80-125 psi (5.6-8.8 kg/cm2 ).
- If pressure is above 200 psi (14.1 kg/cm2 ), check hoses for restrictions and poppet valve (Saginaw gears) for proper assembly.
- Close gate valve completely and reopen 3 times. Record highest reading each time. DO NOT close valve for more than 5 seconds. If pressure is less than specification, clean or replace flow control valve in pump. If pressures are still low, replace pump.
- If readings are within specifications and within 50 psi (3.5 kg/cm2 ) of each other, pump is operating properly. See Pressure Test Specifications table. If pressures are high, but do not repeat within 50 psi (3.5 kg/cm2 ), flow control valve in pump is sticking. Remove flow control valve and clean or replace.
- If pump checks within specifications, open valve and turn steering wheel all the way from right-to-left stops and record pressure. DO NOT hold wheel against stops more than 5 seconds. Pressure should be the same as specified. See in Pressure Test Specifications table.
- If pressure is low, steering gear is leaking internally and must be overhauled.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.