Power Steering - Shudder/Moan or Vibration
91chevy22
Number: 91-408-3B
Section: 3B
Date: AUGUST 1991
Corporate Bulletin No.: 133209R
ASE No.: A4
Subject: POWER STEERING SHUDDER
Model and Year: 1989 CAVALIER, CORSICA AND BERETTA WITH 2.0L AND 2.8L ENGINES 1990 CAVALIER, CORSICA AND BERETTA WITH 2.2L, 2.3L AND 3.1L ENGINES 1991 CAVALIER, CORSICA AND BERETTA WITH 2.2L AND 3.1L ENGINES
THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO. 90-326-3B, DATED AUGUST 1990. THE 1991 MODEL YEAR HAS BEEN ADDED AS WELL AS THE CAVALIER AND CORSICA VEHICLES. ALSO, ADDITIONAL INFORMATION HAS BEEN ADDED. ALL COPIES OF 90-326-3B SHOULD BE DISCARDED.
MODELS/YEARS:
1990-91 "J" and "L" w/2.2L (VIN G) engine
1990-91 "J" and "L" w/3.1L (VIN T) engine
1990 "L" w/2.3L (VIN A) engine
1989 "J" and "L" w/2.0L (VIN 1) engine
1989 "J" and "L" w/2.8L (VIN W) 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.
1990-91 "J" w/2.2L (VIN G) engine
1989 "J" w/2.0L (VIN 1) engine
This condition may be repaired by installing a "tuned" return hose, P/N 26025260.
J-cars built during the 1991 model year already have the "tuned" return hose. If a 1990 2.2L J-car already equipped with a tuned return hose, or a 1991 2.2L J-car exhibits the shudder, install a high expansion pressure hose, P/N 26029284.
1990-91 "J" w/3.1L (VIN T) engine
1989 "J" w/2.8L (VIN W) engine
Starting with the following VIN breakpoints, 1991 model vehicles are being built with a new high expansion pressure hose which corrects this condition. Vehicles built BEFORE the VIN breakpoints listed below may be repaired by installing a new high expansion pressure hose, P/N 26026623.
(Lordstown) M7117613
1990-91 "L" w/2.2L (VIN G) engine
1989 "L" w/2.0L (VIN 1) engine
This condition may be repaired by installing a tuned return hose, P/N 26006690.
"L" cars built during the 1991 model year already have the tuned return hose. If a 1990 2.2L L-car already equipped with a tuned return hose, or a 1991 2.2L L-car exhibits the shudder, install a high expansion pressure hose, P/N 26029284.
1990 - 91 "L" w/3.1L (VIN T) engine
1989 "L" w/2.8L (VIN W) engine
Starting with the following VIN breakpoints, 1991 model vehicles are being built with a new high expansion pressure hose which repairs this condition. Vehicles built before the VIN breakpoints listed below may be repaired by installing a new high pressure expansion hose, P/N 26028229.
(Linden) ME178914
(Wilmington) MY219301
1990 "L" w/2.3L (VIN A) engine
Starting with the following VIN breakpoint, 1990 vehicles are equipped with a "tuned" return hose which helps this condition. Vehicles built before this VIN breakpoint, may be repaired by installing a new "tuned" return hose, P/N 26024663.
(Wilmington) LY223211
Note: If the above hoses do not repair the shudder condition, please contact Technical Assistance.
Parts are currently available from GMSPO.
Labor Operation Number: Pressure Hose E8622
Labor Time : See Current Labor Time Guide
Trouble Code : 92
Labor Operation Number: Return Hose E8623
Labor Time : See Current Labor Time Guide
Trouble Code : 92