Engine Mounts - Vibration at Idle

BULLETIN NUMBER
SB91-01-003

ISSUE DATE
May 23, 1991

GROUP
ENGINE

PICKUP 90 VIBRATION AT IDLE

AFFECTED VEHICLES

1990-91 Pickup (M) models with 4ZD1 or 4ZE1 engine.

SERVICE INFORMATION

Because of varying tolerances from vehicle to vehicle, some affected vehicles may experience steering wheel vibration during idle. If engine mechanical problems do not exist, install new, improved engine mounts (see "Parts Information" section of this Service Bulletin) to correct this condition.

SERVICE PROCEDURE

1. Check engine operation to confirm that there are no engine mechanical problems (such as spark plug failure or idle adjustment).

2. If engine is operating properly and steering wheel vibration continues, replace the right and left side engine mounts as described in the appropriate Workshop Manual, using new, improved parts listed below.





PARTS INFORMATION

FLAT RATE MANUAL INFORMATION

Use existing Flat Rate Manual labor operation numbers 01 1303 and 01 1403.