Firebird V8-305 5.0L (1982)
Torque Converter Clutch: All Technical Service Bulletins
Engine - Stops Running Due to TCC Engagement
Number
86-7-20
Date
3/86
Subject:
ENGINE STOPS RUNNING DUE TO TCC ENGAGEMENT WHEN SHIFTED FROM PARK/ NEUTRAL TO REVERSE OR DRIVE
ALL 1981 THROUGH 1986 PONTIAC MODELS EQUIPPED WITH 200-4R OR 700-R4 TRANSMISSION
CONVERTER CLUTCH VALVE
A 1981 through the current production model year vehicle that uses either a THM 200-4R or THM 700-R4 transmission may have a condition where the
engine stops running, or lugs, when shifted from Park/ Neutral to Reverse or Drive.
This condition may be a result of torque converter clutch engagement when either gear range is selected, and may be caused by improper operation of the
converter clutch valve, located in the pump cover (Refer to Figure 1).
If this condition exists, inspect the converter clutch apply valve for the following:
^
Not properly seated or missing retaining ring (item 225). When installing this retaining ring make certain the rounded edge of the ring faces the
valve stop (item 226). (Refer to Figure 2)
^
Converter clutch valve (item 227) or valve bore having nicks or burrs.
^
Missing, broken or damaged converter clutch valve springs (outer spring item 228 and inner spring item 229).
IMPORTANT:
Prior to servicing the pump assembly for the above condition, make certain that the engine is properly set to specifications.
Refer to the appropriate Service Manual for removal and installation procedures.
