Grand Prix V6-3.8L SC VIN 1 (1997)
Power Steering Pump: Testing and Inspection
Diagnosis By Symptom
FOAMING, MILKY POWER STEERING FLUID, LOW FLUID LEVEL, AND POSSIBLE LOW PRESSURE
These conditions can be caused by air in the fluid, and loss of fluid due to internal pump leakage causing overflow. Check for leak and correct fluid
level. Bleed the system. Extremely cold temperatures will cause air bubbles in the system if the fluid level is low. If the fluid level is correct and pump
still foams, remove pump from vehicle and separate reservoir from housing. Check soft plug and housing for cracks. If housing is cracked, replace
housing.
LOW PRESSURE DUE TO STEERING PUMP
Inspect:
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Flow control valve for proper operation.
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Pressure plate for proper mating with cam ring.
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Cam ring for wear or damage.
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Pressure plates, thrust plate, and rotor for wear or damage.
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Rotor slots for proper vane operation.
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Pump for high internal leakage.
LOW PRESSURE DUE TO STEERING GEAR
Inspect:
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Housing bore for scoring or other damage.
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Valve rings and seals for leaking.
GROANING NOISE IN STEERING PUMP
Inspect:
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Steering gear for restriction which causes excessive backpressure.
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Pressure plates, thrust plate, or rotor for wear or damage.
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Cam ring for wear or damage.
RATTLING NOISE IN STEERING PUMP
Inspect:
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Rotor slots for proper vane operation.
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Vane for proper installation.
SWISHING NOISE IN STEERING PUMP
Inspect:
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Flow control valve for damage.
WHINING NOISE IN PUMP
Inspect:
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Pump shaft bearing for damage.
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Pressure plates and vanes for damage.
