Toronado V6-3800 3.8L (1988)
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paint in the modulator tube restricting vacuum to the modulator causing a delayed response to throttle movement.
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sticking modulator valve
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sticking 1-2 servo valve
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missing checkball (no. 2, 4 or 12)
SERVICE ACTION:
Remove the control valve assembly from the transaxle and disassemble the 3-2 control valve train. Install the 3-2 control valve spring (341) from the
appropriate service package shown in the Service Parts Information section.
FIGURE 1 - THM 440-T4 TRANSAXLE IDENTIFICATION INFORMATION
SERVICE PARTS INFORMATION:
Transaxle Model
3-2 Control Valve
Identification
Spring Package
(Figure 1)
Number
Contents
8FCH
8646979
(1) 3-2 Control Valve Spring
(2)
Spacer Plate Gaskets
(1)
Instruction Sheet
8BKH, 8FBH
8646982
(1) 3-2 Control Valve Spring
(2)
Spacer Plate Gaskets
(1)
Instruction Sheet
8BJH, 8BRH
8646993
(1) 3-2 Control Valve Spring
8BTH, 8BYH
(2) Spacer Plate Gaskets
8FJH
(1) Instruction Sheet
Parts are currently available from GMSPO.
SERVICE MANUAL REFERENCE:
Refer to the appropriate 1988 Service Information Manual. Section 7A1 Automatic Transaxle On-Car Service and THM 440-T4 (ME9) Automatic
Transaxle Unit Repair Table of Contents for control valve assembly service information.
