DIAGNOSIS AND TESTING
POWER STEERING SYSTEM
STEERING NOISE
There is some noise in all power steering systems. One of the most common is a hissing sound evident at a
standstill parking. Or when the steering wheel is at the end of it’s travel. Hiss is a high frequency noise similar
to that of a water tap being closed slowly. The noise is present in all valves that have a high velocity fluid passing
through an orifice. There is no relationship between this noise and steering performance.
CONDITION POSSIBLE CAUSES CORRECTION
OBJECTIONAL HISS OR
WHISTLE
1. Steering intermediate shaft to dash panel
seal.
1. Check and repair seal at dash
panel.
2. Noisy valve in power steering gear. 2. Replace steering gear.
RATTLE OR CLUNK 1. Gear mounting bolts loose. 1. Tighten bolts to specification.
2. Loose or damaged suspension
components.
2. Inspect and repair suspension.
3. Internal gear noise. 3. Replace steering gear.
4. Pressure hose in contact with other
components.
4. Reposition hose.
5. Loose or damaged intermediate shaft or
column.
5. Inspect and repair or replace.
CHIRP OR SQUEAL 1. Loose belt. 1. Adjust or replace.
Fig. 2 Steering Pump, Gear And Oil Cooler - 4.7L
1 – HYDRAULIC PUMP
2 – RACK AND PINION GEAR
3 – OIL COOLER
19 - 2 STEERING DN
DESCRIPTION AND OPERATION (Continued)
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