Skylark L4-151 2.5L (1991)
Power Steering Line/Hose: All Technical Service Bulletins
Power Steering - Shudder/Moan/Vibration
Bulletin: 91-3-17
Date: August 91
Ref. No.: 91-232-3
Corp. Ref. No.: 133209
SUBJECT:
POWER STEERING SHUDDER (INSTALL A "TUNED" OR HIGH EXPANSION HOSE)
MODELS AFFECTED: 1989-91 SKYLARK WITH 2.5L (VIN (U) ENGINE 1990 SKYLARK WITH 2.3L CODE D QUAD 4 ENGINE 1989-90
SKYLARK WITH 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 Skylark with 2.3L (VIN D) engine
Starting with the following VIN breakpoints 1990 vehicles are equipped with a "tuned" return hose which should reduce or eliminate the shudder
condition.
"TUNED" RETURN HOSE
Lansing
LM017241
Starting with the following VIN breakpoints, 1990 vehicles are also equipped with a new high expansion pressure hose which further reduces the shudder
condition:
NEW PRESSURE HOSE
Lansing
LM045756
Vehicles built BEFORE the above listed "TUNED RETURN HOSE" breakpoints, 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 breakpoints, but before the above listed "NEW PRESSURE
HOSE" VIN breakpoints, 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 breakpoints are equipped with a "tuned" return hose and a new high expansion
pressure hose and should not exhibit the shudder condition.
1989-90 Skylark with 3300 (VIN N) engine
