B Series Truck L4-2000 1998cc (1986)
Throttle Control Actuator: Customer Interest
Engine - Vibration or Resonance Noise Inside Cab At Idle
Category 1
Applicable Model/s 1986-87 B2000 1987 B2200
Subject IDLE VIBRATION
Bulletin No.
048/89
Issued
12/29/89
Revised
DESCRIPTION
If a customer complains of a vibration or resonance noise inside the cab of a 1986-87 B2000/1987 B2200 at idle, follow the repair procedure shown
below.
REPAIR PROCEDURE
1.
IDLE SPEED AND IDLE-UP ADJUSTMENT Adjust the idle speed and idle-up according to the instructions shown in the appropriate
workshop manual.
NOTE:
Transmission in neutral or "P" range.
Idle Speed:
Idle-Up:
B2000: 800-850 rpm (page 4-60)
B2000 with A/C: 1,300-1,500 rpm (page 4-62)
B2200: 800-850 rpm (page 4B-79)
B2200 with A/T: 920-970 rpm (page 4B-81)
B2200 with A/C: 1,300-1,500 rpm (page 4B-81) B2200 with A/T & A/C: 1,300-1,500
rpm (page 4B-82)
II. ENGINE MOUNTS
Replace the engine mounts with the modified mounts.