Subaru Impreza 2003 Service Manual page 2316

DRIVE SHAFT SYSTEM
7. General Diagnostic Table
A: INSPECTION
NOTE:
Vibration while cruising may be caused by an unbalanced tire, improper tire inflation pressure, improper
wheel alignment, etc.
Symptom
1. Vibration of propeller shaft
NOTE:
Vibration is caused by propeller shaft dur-
ing operation and is transferred to vehicle
body. Generally vibration increase in pro-
portion to vehicle speed.
2. Tapping when starting and noise
while cruising, caused by propeller
shaft
GENERAL DIAGNOSTIC TABLE
Possible cause
(1) Worn or damaged universal joint.
(2) Unbalanced propeller shaft due to
bend or dent.
(3) Loose installation of propeller shaft.
(4) Worn or damaged center bearing and
damaged center mounting rubber.
(1) Worn or damaged universal joint.
(2) Worn spline of sleeve yoke.
(3) Loose installation of propeller shaft.
(4) Loose installation of joint.
(5) Worn or damaged center bearing and
damaged center mounting rubber.
DS-44
Remedy
Replace.
Replace.
Retighten.
Replace.
Replace.
Replace.
Retighten.
Replace.
Replace.