Engine - Vibration In Gear, Knock On Acceleration
12-038
October 23, 2012
Applies To:
2005-11 RL - ALL
Vibration in Gear or Knock Noise on Acceleration
SYMPTOM
There is a vibration when putting the transmission in gear or a knocking noise when accelerating.
PROBABLE CAUSE
The rubber on the engine mounts has deteriorated from high underhood engine temperatures.
CORRECTIVE ACTION
Replace the front, the side, or both the engine mounts.
PARTS INFORMATION
WARRANTY CLAIM INFORMATION
The normal warranty applies.
Failed Part: P/N 50830-SJA-EO1
Defect Code: 01102
Symptom Code: 03220
Skill Level: Repair Technician
DIAGNOSIS
1. Stand to the side of the vehicle's engine compartment, and watch the top of the front engine mount.
2. Have an assistant shift the transmission into D. With the assistant's foot firmly on the brake pedal, have him quickly press the accelerator pedal
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and release it.
3. Look for contact or listen for a knock between the top of the front engine mount and the bottom of the front engine mount stop.
4. Visually inspect the side engine mount for tearing or signs of leakage.
^ If the front engine mount makes contact or knocks, go to REPAIR PROCEDURE A.
^ If the side engine mount is torn or leaking, go to REPAIR PROCEDURE B.
^ If both front and side engine mounts are damaged, do both REPAIR PROCEDURE A and B.
REPAIR PROCEDURE A
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1. Disconnect the washer tubes. Remove the clips, then remove the right upper fender trim.
2. Raise the vehicle on a lift.
3. Remove the splash shield.
^ Remove the clips that secure the front inner fender and the splash shield to the body.
^ From under the front bumper, remove the bolts and the clips.
^ From under the body, remove the bolts and the clips.
^ Release the hooks of the splash shield, then pull out the splash shield.
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4. Remove the harness connectors, the ground cable, and the harness clamps.
5. Loosen the A/C condenser fan shroud mounting bolts.
6. Lower the vehicle.
7. Remove the air intake duct cover and the coolant reservoir.
8. Disconnect the RFC connectors and the A/C condenser fan motor connector, then remove the harness clamps.
9. Remove the RFC unit from the radiator fan shroud.
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10. Remove the A/C condenser fan shroud assembly, then remove the radiator fan shroud assembly.
NOTE:
Pull up the radiator, then move the radiator fan shroud assembly toward the right side of the vehicle to allow enough space to lift it up and
away from the A/C condenser fan shroud assembly.
11. Remove the front engine mount stop, and disconnect the vacuum hose.
12. Remove the front engine mount flange bolt.
13. Lift and support the engine with a jack and a block of wood under the engine/transmission.
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14. Remove the front engine mount from the subframe.
15. Remove the front engine mount insulator, then disconnect the vacuum hose.
16. Remove the front engine mount insulator, then disconnect the vacuum hose.
17. Reconnect the vacuum hose, and install the engine mount insulator to the front engine mount.
18. Install the new front engine mount to the front subframe, then torque the new bolts to 54 N~m (40 Ib4t).
19. Remove the jack and the wood block.
20. Tighten the new front engine mount flange bolt to 54 N.m (40 lb-ft), then install the front engine mount stop and tighten the new nuts to 64 N.m
(47 lb-ft).
21. Reconnect the vacuum hose.
22. Reinstall the radiator fan shroud assembly and tighten the bolts to 7.0 N.m (5.2 lb-ft).
23. Reinstall the A/C condenser fan shroud assembly.
24. Reinstall the RFC unit.
25. Reconnect the RFC connectors and the A/C condenser fan motor connector, then install the clamps.
26. Reinstall the coolant reservoir, and the air intake duct cover.
27. Raise the vehicle on a lift.
28. Tighten the A/C condenser fan shroud mounting bolts to 7.0 N.m (5.2 lb-ft).
29. Reinstall the harness connectors, the ground cable, and the harness clamps.
30. Reinstall the splash shield.
31. Lower the vehicle.
32. Reinstall the right side fender trim.
REPAIR PROCEDURE B
1. Lift and support the engine with a jack and a block of wood under the engine oil pan.
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2. Remove the ground cable, then remove the upper half of the side engine mount bracket.
3. Remove the side engine mount.
4. Reinstall the new side engine mount and tighten the bolts to 54 N.m (40 lb-ft).
5. Install the upper half of the side engine mount bracket, and tighten the two new vertical mounting bolts to 54 N.m (40 lb-ft).
6. Remove the jack and the block of wood.
7. Tighten the new side horizontal engine mount bolt to 64 N.m (47 lb-ft).
8. Reinstall the ground cable and tighten the bolt to 12 Nm (9 lb-ft).
