ENGINE CHUGGLE AT LOW SPEEDS RAISE TCC SPEED (PROM). Pontiac Grand Am 1989

THIS BULLETIN HAS BEEN REVISED TO INCLUDE THE 1990 AND 1991 J CAR WITH 2.0L ENGINE. ---------------------------------------------------------------------

CONDITION: SOME OWNERS OF 1989-91 J CARS WITH 2.0L AND 1989 N CARS WITH 2.5L ENGINES MAY COMMENT OF AN ENGINE SHUDDER OR CHUGGLE CONDITION WHEN DRIVING AT SLOW SPEEDS IN HIGH GEAR.

CAUSE: CONVERTER CLUTCH LOCK UP AT SLOW SPEEDS DURING SOME DRIVING CONDITIONS.

CORRECTION: A NEW PROM PACKAGE HAS BEEN RELEASED WHICH RAISES THE TC LOCKUP SPEED TO THE FOLLOWING: ---------------------------------------------------------------------

1989 - 1991 J-CAR WITH 2.0L -------------------------------- FROM 23 TO 39 MPH

USAGE PROM PKG P/N BROADCAST CODE SCANNER I. D. ------ ------------ --------------- --------------

ALL 16157159 AWSP 7171

1989 N-CAR WITH 2.5L ENGINE -----------------------------

FROM 29 TO 43 MPH.

USAGE PROM PKG P/N BROADCAST CODE SCANNER I.D. ------ ------------- -------------- -------------

ALL 16157765 AWDT 7781

LABOR OPERATION NUMBER: T0500

LABOR TIME : .3 HOUR

FIGURES: 0

BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THESE 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 TOOLS, EQUIPMENT, 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 YOUR RETAILER FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.