SW1 L4-1.9L SOHC VIN 8 (1996)
Exhaust Pipe/Muffler Hanger: All Technical Service Bulletins
Engine - Vibration at Idle
BULLETIN NO.: 95-T-36
ISSUE DATE: August, 1995
GROUP/SEQ. NO.: Engine-07
CORPORATION NO.: 586002
SUBJECT:
Objectionable Engine Vibration at Idle (Check Cooling Module Mounts, Engine Strut Cradle Bracket, Muffler Hanger and Strap, and Adjust or Replace
as Required)
MODELS AFFECTED:
1994-1996 Saturns
CONDITION:
Some customers may comment about objectionable engine vibration at idle. This condition may be more noticeable when the engine reaches normal
operating temperature.
CAUSE:
Objectionable engine vibration at idle may be caused by one or more of the following conditions:
^
Engine not idling properly.
^
Improper positioning of upper cooling module grommets; lower cooling module not seated; improper positioning of A/C wiring harness.
^
Preloaded engine strut cradle bracket.
^
Improperly positioned muffler hanger and strap.
IMPORTANT:
The rubber isolation cushion in the engine mount has been improved on all 1994 through 1996 vehicles. The engine mount should not cause
objectionable engine vibration at idle.
CORRECTION:
Refer to Procedures to diagnose and repair any condition that could cause objectionable engine vibration at idle.
Some level of engine vibration is normal during initial engine warm-up. Engine idle vibration quality should be evaluated only when the engine reaches
operating temperature and when the engine maintains a stable RPM. Before evaluating engine idle vibration quality, road test the vehicle and verify that
the condition is present with the engine at operating temperature. Using a portable diagnostic tool (PDT), make sure the engine's ignition and fuel
systems are functioning properly. If the engine is not running properly, repair as needed.
PROCEDURES:
Vibrations are normally felt in the steering wheel, lower seat cushion, seat back, or floor pan Vibrations should be diagnosed with the vehicle stopped
and the transaxle in Drive ("D") for automatic transaxles and in Neutral for manual transaxles. If the vehicle is equipped with A/C, make sure the A/C
compressor is OFF.
