Engine - Vibration at Idle or Clunk Noise at Launch
Group Ref.: EngineBulletin No.: 436103
Date: May, 1994
SUBJECT:
ENGINE VIBRATION AT IDLE OR CLUNK NOISE AT LAUNCH
(REPLACE ENGINE MOUNT)
MODELS:
1993-94 CHEVROLET CAVALIER
1993-94 PONTIAC SUNBIRD
ENGINE APPLICATIONS:
2.0L (VIN H - RPO LE4)
2.2L (VIN 4 - RPO LN2)
3.1L (VIN T - RPO LHO) WITH 3T40 (MD9) AND ISUZU 5-SPEED (MK7)
CONDITION:
Some owners may experience engine vibration at idle or clunk noise at launch.
CAUSE:
Right rear engine mount sagging.
CORRECTION:
Inspect right rear engine mount while in vehicle for less than 5 mm gap.
If gap checked in diagnosis is less than 5 mm, install the proper replacement engine mount as follows:
All 2.2L (LN2) and 2.0L (LE4) use P/N 22637949. 3.1L (LHO with MD9 only) use P/N 22637950.
1. Install new engine mount and only tighten bolts finger tight to allow seating of engine.
2. Install engine mount bracket bolts only finger tight.
3. Loosen transaxle mount to transaxle mount bracket bolt and the two nuts holding the snubber block on the mount itself.
4. Block wheels.
5. Set parking brake and start engine.
6. Shift from reverse to drive several times to seat the engine and transaxle assembly.
7. Turn ignition switch to "off" position.
8. Tighten transaxle mount to transaxle mount bracket bolt.
9. Tighten engine mount bracket to body bolts.
10. Tighten engine mount to engine mount bracket nuts.
11. Center the snubber block on the transaxle mount (transaxle in "neutral"), then tighten the two nuts holding the snubber block to mount.
Parts are expected to be available on May 2, 1994.
WARRANTY INFORMATION:
For vehicles repaired under warranty, use:
Labor Operation: J1510
Labor Time: 0.8 hr
Add: 0.2 hr (For inspection)
Add: 0.2 hr (To loosen/tighten transaxle mounts)