C 2500 Truck 2WD V8-350 5.7L (1988)
Fluid Pressure Sensor/Switch: Customer Interest
A/T - Buzzing Noise at Idle
Number: 93-29-7A
Section: 7A
Date: OCT. 1992
Corporate Bulletin No.: 277142
ASE No.: A2
Subject:
BUZZING NOISE AT IDLE
Model and Year:
1982-93 CAPRICE, CAMARO AND CORVETTE
1982-93 C/K, R/V, S/T, M/L AND G TRUCKS WTIH 4L60 AUTOMATIC TRANSMISSION
TRANSMISSION APPLICATIONS:
1982-1993 HYDRA-MATIC 4L60 (MD8)
TRANSMISSION MODELS:
All
SUBJECT:
Pressure Regulator Valve Buzz
VEHICLE APPLICATIONS:
B, D, F, Y - Cars C/K, R/V, S/T Trucks G, M, L - Vans
CONDITION:
Some 1982-1993 vehicles 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:
