A/T - Grunt/Squeak Shifting from Park to Reverse/Drive
Group Ref.: 6 - EngineBulletin No.: 336102A
Date: June, 1994
SUBJECT:
GRUNT, SQUAWK OR SQUEAK NOISE WHEN SHIFTING FROM PARK TO REVERSE OR DRIVE AND/OR UNDER HEAVY ENGINE LOAD (USE DIAGNOSTIC PROCEDURE)
MODELS:
1992-93 BUICK SKYLARK
1992-93 CHEVROLET CORSICA/BERETTA
1992-93 OLDSMOBILE ACHIEVA
1992-93 PONTIAC GRAND AM
ENGINE APPLICATION:
2.3L (VIN 3 - RPO L40)
2.2L (VIN 4 - RPO LN2)
2.3L (VIN D - RPO LD2)
3.3L (VIN N - RPO LG7)
3.1L (VIN T - RPO LHO) WITH AUTOMATIC TRANSMISSION ONLY
THIS BULLETIN IS BEING REVISED TO ADD ENGINE APPLICATIONS AND REVISE/ADD PART NUMBERS. PLEASE DISCARD BULLETIN 336102 (GROUP REFERENCE 6 - ENGINE.)
CONDITION:
Some owners may comment about a grunt, squawk or squeak noise when shifting from park to reverse or drive. The same noise may also be heard during heavy engine load, such as quick acceleration. The noise will most likely occur in cold ambient temperatures or wet conditions. This noise may be misdiagnosed as coming from the exhaust seal (except RPO LN2). Use the procedure found in "Service Information" below to determine the location of the noise.
CAUSE:
On 1992-93 vehicles, the lower engine mount strut rubber may move against its metal casting during the shift or heavy engine loads. On 1992 2.3L engines, a similar noise can be caused by high clamp load on the exhaust seal. This condition is addressed by corporate bulletin number 276101R (divisional numbers listed below):
DIVISION BULLETIN NUMBER
Pontiac 92-6-20A
Oldsmobile 92-T-54A
Buick 92-6-4A
GM of Canada 92-623-102
CORRECTION:
When the diagnosis indicates the exhaust system is at fault on 1992 2.3L engines, refer to corporate bulletin number 276101R to repair the exhaust system. All 1993 model year production vehicles with 2.3L engines have a redesigned exhaust manifold and seal. Install revised lower engine mount strut, P/N 22594147 - 2.2L and 2.3L, or P/N 22637875 - 3.1L and 3.3L (DO NOT use for 1994 models) when diagnosis indicates the lower engine mount strut is at fault. Vehicles built after the following VIN breakpoints have the revised lower engine mount strut installed in production:
2.3L and 2.2L engines with automatic transmissions:
All 3.1L and 3.3L engines with automatic transmissions.
Service Information:
IMPORTANT:
Torque axis mounting systems allow more engine movement than other engine mounting systems. This movement may seem excessive but that is the design intent of the mounting system. Do NOT replace any torque axis mounts for movement unless there is damage to the mount or rubber.
Diagnosis:
Spray 3M silicone lubricant P/N 51135-08935 or equivalent on the lower engine mount strut between the rubber and metal.
NOTE:Use only silicone type lubricant between the rubber and metal surfaces. Any other lubricant will destroy the rubber making replacement of the lower engine mount strut necessary.
If the noise still exists, refer to corporate bulletin number 276101R for exhaust system seals and submit labor operation J0005 (except RPO LN2). If the noise is gone, replace the lower engine mount strut with P/N 22594147 (2.2 & 2.3L engines, DO NOT use for 1994 models) or P/N 22637875 (3.1L and 3.3L engines, DO NOT use for 1994 models) and submit labor operation J1520. The silicone lubricant will eliminate the condition for a short time only.
Parts are expected to be available on June 20, 1994.
WARRANTY INFORMATION:
For vehicles repaired under warranty, use:
