GROWL,NOISE,EXHAUST NOISE COOLANT LEAK OR STEERING VIB.

SUBJECT: GROWL NOISE, EXHAUST NOISE, COOLANT LEAK OR STEERING WHEEL VIBRATION (REPLACE ENGINE MOUNT LOWER STRUT)

VEHICLES AFFECTED: 1992 "N, L" MODELS CHEVROLET CORSICA, BERETTA PONTIAC GRAND AM OLDSMOBILE ACHIEVA BUICK SKYLARK

CONDITION:

---------- Some owners of 1992 N and L cars may experience the following conditions:

1. Engine rocking more than normal back and forth in engine compartment during acceleration and deceleration.

2. Exhaust noise at the exhaust manifold seal during acceleration and deceleration.

3. Engine coolant leak from the radiator outlet hose, 2.3L (VIN A, D, 3).

4. Engine vibration felt through the steering wheel.

5. Growl or grounding out noise from the underhood area.

CAUSE:

------ Engine mount lower strut breaking from road shock, road debris impact or repeated rapid acceleration.

CORRECTION:

----------- Replace engine mount lower strut.

SERVICE INFORMATION:

- Refer to Section 6A7 for lower engine mount strut replacement.

- Be sure to inspect the following items. Some items may not apply to all vehicles.

- Engine cooling system for leaks.

- Radiator outlet hose for possible damage and/or leaks 2.3L (VIN A, D, 3).

- Drive axle boots for damage.

- Electrical wires and connections for damage.

- The strut to bracket bolt (5) is tightened to 120 N.m (89 ft.lbs.) and is longer than the strut to the suspension support bolt, which is tightened to 75 N.m (55 ft.lbs.). Use hole "A" for automatic transaxles and hole "M" for manual transaxles. Refer to illustration for correct fastener tightening specifications, bolt usage and bolt location.

Note: The 3.3L (VIN N) has only one hole in the engine mount strut assembly bracket. (Refer to Figure 1, item #1)

VIN BREAKPOINTS:

DIVISION CAR ENGINE TRANSAXLE VIN BREAKPOINT -------- --- ------ --------- -------------- Chevrolet L 2.2L (VIN 4) Automatic NY210250 Chevrolet L 2.2L (VIN 4) Manual NY202556 Chevrolet L 3.1L (VIN T) Automatic NY201241 Chevrolet L 3.1L (VIN T) Manual NY201868 Chevrolet L 2.3L (VIN A) Manual NY201868 Pontiac N 2.3L (VIN D, 3) Automatic NC236804/NM050776 Pontiac N 2.3L (VIN A) Manual NC237001 Pontiac N 2.3L (VIN 3) Manual NC243142/NM051566 Pontiac N 3.3L (VIN N) Automatic NC236844/NM050443 Oldsmobile N 2.3L (VIN D, 3) Automatic NM421783 Oldsmobile N 2.3L (VIN A) Manual NM421742 Oldsmobile N 2.3L (VIN 3) Manual NM422640 Oldsmobile N 3.3L (VIN N) Automatic NM421499 Buick N 2.3L (VIN 3) Automatic NC633891 Buick N 3.3L (VIN N) Automatic NC633903

PARTS INFORMATION:

Use the following New Part Numbers when replacing the Lower Engine Mount Strut:

CAR ENGINE TRANSAXLE OLD P/N NEW P/N --- ------ --------- -------- ------- L 2.2L (VIN 4) Automatic 22112378 22113208 L 2.2L (VIN 4) Manual 22112379 22113209 L 3.1L (VIN T) Automatic 22113005 22113210 L 3.1L (VIN T) Manual 22112730 22113211 L 2.3L (VIN A) Manual 22112730 22113211 N 2.3L (VIN D, 3) Automatic 22112378 22113208 N 2.3L (VIN 3) Manual 22112379 22113209 N 2.3L (VIN A) Manual 22112730 22113211 N 3.3L (VIN N) Automatic 22112380 22113212

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.