Roadmaster V8-305 5.0L (1992)
Fluid Pressure Sensor/Switch: All Technical Service Bulletins
A/T - Buzzing Noise at Idle
Bulletin: 93-74L60-2
Date: Nov., '92
Ref.No.: 93-36-74L60
Corp.Ref.No.: 277142
SUBJECT:
BUZZING NOISE AT IDLE (INSTALL NEW PRESSURE REGULATOR VALVE)
MODELS AFFECTED:
1991-93 ROADMASTERS
CONDITION:
Some 1991-93 Roadmasters equipped with a HYDRA-MATIC 4L60 transmission may have a buzzing noise coming from the transmission when the
vehicle is at idle. The buzzing noise may be noticed more when the vehicle is in reverse at idle.
CAUSE:
The buzzing noise may be a result of pressure regulator valve oscillating due to oil pressure instability at lower idle RPM.
CORRECTION:
