A/T - Engine Speed Flare During Part Throttle Downshift
File In Section: 7 - TransmissionBulletin No.: 67-71-47
Date: July, 1996
Subject:
3-2 Part Throttle Downshift Flare (Replace 3-2 Solenoid)
Models:
1996 Buick Roadmaster
1996 Cadillac Fleetwood
1996 Chevrolet Camaro, Caprice, Corvette
1996 Pontiac Firebird
1996 Chevrolet and GMC C/K, M/L, S/T, G Models
1996 Oldsmobile Bravada
with HYDRA-MATIC 4L60-E (RPO M30)
Condition (Figures 1 and 2)
Some owners of the above models with a HYDRA-MATIC 4L60-E transmission (built before May 24, 1996/Julian Date 6145) may experience an engine speed flare of 1000-2000 RPM, during a part throttle downshift at 19-31 mph. This condition will not set any DTC's (Diagnostic Trouble Codes).
Cause
Exhaust seat on the 3-2 control solenoid backing out.
Correction (Figure 3)
Replace the 3-2 control solenoid. Julian Date on the solenoid will be May 13, 1996 (6134) or later.
Parts Information
New Part Number Description
24209121 Solenoid, 3-2 Control
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation Description Labor Time
K6559 Replace 3-2 Use published labor
Control Solenoid operation time.