Calais L4-138 2.3L VIN D FI (1990)
Power Steering Line/Hose: All Technical Service Bulletins
Steering Wheel - Moan or Vibration When Turning
NUMBER:
91-T-193
CORP.REF.NO.: 133209
DATE:
September 1991
SECTION:
3
SUBJECT
POWER STEERING SHUDDER INSTALL A "TUNED" OR
HIGH EXPANSION HOSE
MODELS/YEARS
1989-91 CUTLASS CALAIS
This bulletin cancels and supersedes Dealer Technical Bulletins 90-T-44A and 90-T-44B which should be discarded
Models/Years Affected:
1989-91
W/2.5L (VIN U) ENGINE
1990
W/2.3L (VIN D or A) ENGINE
1989-90
W/3300 (VIN N) ENGINE
CONDITION: Customers may comment about a shudder, moan or vibration that occurs when turning the steering wheel under the following conditions:
^
Vehicle stopped with brake applied (or moving very slowly)
^
Vehicle in gear
^
Engine at idle speed
The shudder or moan may occur during parking maneuvers or other situations when the steering wheel is turned while the vehicle is stopped or moving
very slowly. It is also sensitive to steering wheel rotational speed as well as engine speed. The shudder is commonly more severe during hot ambient
temperatures.
CAUSE:
A combination of steering gear valve instability and/or engine firing pulses generating a disturbance that is transmitted through the body
structure.
CORRECTION:
Install a "tuned" power steering return hose and/or high expansion pressure hose between the steering pump and gear.
1990 Cutlass Calais W/2.3L (VIN D or A) ENGINE
"Tuned" Return Hose
Starting with vehicle number LM717359, 1990 vehicles are equipped with a "tuned" return hose which should reduce or eliminate the shudder condition.
New Pressure Hose
Starting with vehicle number LM744715, 1990 vehicles are also equipped with a new high expansion pressure hose which further reduces the shudder
condition.
Vehicles built BEFORE the above listed "TUNED RETURN HOSE" breakpoint, and the shudder condition, may be repaired by installing a "tuned"
return hose, P/N 26023904. In a very limited number of cases, the tuned return hose may not completely eliminate the shudder condition. In these cases,
the condition may be repaired by installing a new high expansion pressure hose, P/N 26024244 (and removal of the clip from the power steering pump).
Vehicles built ON OR FOLLOWING the above listed "TUNED RETURN HOSE" VIN breakpoint, but before the above listed "NEW PRESSURE
HOSE" VIN breakpoint, are equipped with tuned return hoses, but are not equipped with new high expansion pressure hoses.
For vehicles in this range that still exhibit some power steering shudder, the condition may be repaired by installing a new high expansion hose P/N
26024244 (and removal of the clip from the power steering pump).
Vehicles built after the above listed "NEW PRESSURE HOSE" VIN breakpoint are equipped with a "tuned" return hose and a new high expanslon
pressure hose and should not exhibit the shudder condition.
1989-90 W/3300 (VIN N) ENGINE
