EXPERTEC Technical Service Bulletins (376517A)

Publication date: 1994-08-01
Reference number: 376517A

EXPERTEC TECHNICAL SERVICE BULLETINS

TECHNICAL SERVICE BULLETIN

Reference Number(s): 376517A, Date of Issue: 08/01/1994
Superceded Bulletin(s): 376517, Date of Issue: July 20, 1994

CHUGGLE AT 36 MPH AND ABOVE WITH TORQUE CONVERTER CLUTCH ENGAGED (INSTALL NEW MEM-CAL)

Model(s): 1993-94 Buick LeSabre, Park Avenue, Regal

Bulletin No.: 376517A

Date: August 1, 1994

NOTE: This bulletin revises the applicable model years to include and provides 1994 part number information. Please discard bulletin 376517 (Group Reference 6E - Engine Fuel & Emission), dated July 20, 1994.

CONDITION

Some owners may experience a condition described as a "miss," "skip," "chuggle," "hesitation," or "fish bite" sensation while driving the vehicle at 36 mph and above.

CAUSE

With the TCC engaged, any powertrain or vehicle rotating disturbance is transmitted to the passenger compartment. Refer to note 3 under the heading "Correction."

CORRECTION

If the technician determines no other conditions are causing the concern, as outlined in section 6E3-B in the appropriate service manual, a service MEM-CAL is available to only raise the third gear TCC lock from 36 to 50 mph and fourth gear TCC lock from 45 to 54 mph. No other driveability issues are addressed with this MEM-CAL.

NOTE 1

The revised MEM-CALS are not considered a 100 percent cure, however, most customers do not perceive the "chuggle" or "fish bite" sensation with the higher TCC lock up speeds.

NOTE 2

The revised MEM-CALS may adversely affect fuel economy (usually less than one MPG depending on individual driving habits). Be sure to advise the vehicle owner of this fact.

NOTE 3

Chuggle may also be caused by other conditions, for example, out-of-balance tires, out-of-round tires, engine miss due to ignition related components or a mechanical failure, A/C compressor cycling, TCC malfunctions causing excessive slip values as measured with a Tech 1, and specific road surface conditions.

SERVICE INFORMATION

Use the procedure in section 6E3 in the service manual for MEM-CAL replacement. There have been no changes in the removal and installation procedure.

PARTS INFORMATION

1993 MODEL YEAR APPLICATIONS INFORMATION

Service Mem-Cal	B/C Code	Mem-Cal ID	Axle	Emis.	Marketing Divisions
"CB" CHUGGLE MEM-CAL - BUICK PARK AVENUE AND OLDS 98 REGENCY
16202846	BKTH	2874	2.84	Fed	Buick, Oldsmobile
16202856	BKTJ	2884	2.84	Calif	Buick, Oldsmobile
16202861	BKTK	2894	3.06	Fed	Buick, Oldsmobile
16202865	BKTL	2904	3.06	Calif	Buick, Oldsmobile
16202868	BKTM	2914	3.06/16" Wheel	Fed	Oldsmobile
16202872	BKTN	2924	3.06/16" Wheel	Calif	Oldsmobile
"HB" CHUGGLE MEM-CAL - BUICK LESABRE, OLDS 88 ROYALE, PONTIAC BONNEVILLE
16202880	BKTP	2934	2.84	Fed	Buick, Olds, Pontiac
16202883	BKTR	2944	2.84	Calif	Buick, Olds, Pontiac
16202887	BKTS	2954	3.06	Fed	Buick, Oldsmobile
16202891	BKTT	2964	3.06	Calif	Buick, Oldsmobile
16202895	BKTU	2974	3.06/16" Wheel	Fed	Oldsmobile, Pontiac
16202898	BKTW	2984	3.06/16" Wheel	Calif	Oldsmobile, Pontiac
"WB" CHUGGLE MEM-CAL - BUICK REGAL
16203286	BKXF	3254	3.06	Fed	Buick
16203289	BKXH	3264	3.06	Calif	Buick
"UB" CHUGGLE MEM-CAL - CHEVROLET LUMINA APV, OLDSMOBILE SILHOUETTE, PONTIAC TRANS SPORT
16203670	BKXY	3644	3.06	NW	Chev., Olds, Pontiac

1994 MODEL YEAR APPLICATIONS INFORMATION

Service Mem-Cal	B/C Code	Mem-Cal ID	Axle	Emis.	Marketing Divisions
"CB" CHUGGLE MEM-CAL - BUICK PARK AVENUE, OLDSMOBILE 98 REGENCY
16202825	BKTB	2834	2.84	NW	Buick, Oldsmobile
16202816	BKSZ	2814	3.06	NW	Buick, Oldsmobile
"HB" CHUGGLE MEM-CAL - BUICK LESABRE, OLDS 88 ROYALE, PONTIAC BONNEVILLE SE
16202842	BKTF	2864	2.84	NW	Buick, Olds, Pontiac
16202828	BKTC	2844	3.06	NW	Buick, Olds, Pontiac
16202832	BKTD	2854	3.06/16" Wheel	NW	Pontiac
"WB" CHUGGLE MEM-CAL - BUICK REGAL
16203293	BKXJ	3274	3.06	NW	Buick
"UB" CHUGGLE MEM-CAL - CHEVROLET LUMINA APV, OLDSMOBILE SILHOUETTE, PONTIAC TRANS SPORT
16203681	BKYA	3664	3.06	NW	Chev., Olds, Pontiac

Parts for 1993 applications are currently available from GMSPO. Parts for 1994 applications are expected to be available from GMSPO on July 11, 1994.

WARRANTY INFORMATION

Labor Operation No.: T0500

Labor Time: 0.6 hr.

NOTE: 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.