For 1990-2009 cars

# IDLE SHAKE PRELOADING ENGINE CORRECTION INFORMATION

SOME EARLY BUILT 1982 "X" CARS AND "A" CARS EQUIPPED WITH 4-CYLINDER ENGINES MAY EXHIBIT AN "IDLE SHAKE" CONDITION CAUSED BY INCORRECTLY PRELOADING THE ENGINE ASSEMBLY. ENGINE PRELOAD IS A FUNCTION OF THE TORQUE STRUT ASSEMBLY. TO CORRECT THIS CONDITION, A NEW TORQUE STRUT ENGINE BRACKET WAS RELEASED WHICH HAS ELONGATED SLOTS TO ALLOW AN ENGINE PRELOAD ADJUSTMENT. THE NEW BRACKET (PART NUMBER 10023434) ENTERED PRODUCTION APPROXIMATELY DECEMBER 15, 1981 AND WILL BE AVAILABLE FOR SERVICE APPROXIMATELY FEBRUARY 1982. EARLY BUILT CARS THAT EXHIBIT AN IDLE SHAKE CONDITION BUILT WITHOUT THE SLOTTED BRACKET SHOULD BE EVALUATED AS FOLLOWS PRIOR TO REPLACING THE BRACKET. FIRST, START THE ENGINE AND ALLOW ENGINE TO REACH NORMAL OPERATING TEMPERATURE. WITH ENGINE AT BASE IDLE RPM, BLOCK DRIVE WHEELS, APPLY PARKING BRAKE, AND PLACE TRANSMISSION IN DRIVE RANGE. REMOVE TORQUE STRUT THROUGH BOLT NUT AT ENGINE BRACKET AND ATTEMPT REMOVAL OF BOLT FROM BRACKET. IF BOLT CAN BE REMOVED EASILY, THE BRACKET SHOULD NOT BE REPLACED. IF THE BOLT IS DIFFICULT TO REMOVE, TURN ENGINE OFF AND PROCEED TO STEPS 1 THROUGH 7 TO REPLACE THE BRACKET. 1.REMOVE TORQUE STRUT THROUGH BOLT FROM STRUT SUPPORT BRACKET AT ENGINE. 2.REMOVE STRUT ENGINE BRACKET AND REINSTALL BRACKET (PART NUMBER 10023434). 3.REINSTALL TORQUE STRUT BOLT AND HAND START NUT. 4.APPLY PARKING BRAKE, BLOCK DRIVE WHEELS, AND START ENGINE. 5.ALLOW ENGINE TO REACH NORMAL OPERATING TEMPERATURE AND WITH ENGINE AT BASE IDLE RPM, MOVE GEAR SELECTOR TO DRIVE RANGE. 6.TORQUE STRUT BOLT TO 56 N.M (43 FT. LBS.). 7.RETURN GEAR SELECTOR TO PARK POSITION AND SHUT ENGINE OFF.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.