Cutlass Ciera Cruiser V6-231 3.8L (1985)
Governor: All Technical Service Bulletins
A/T - Intermittent Delayed Upshifts
SUBJECT
INTERMITTENT DELAYED UPSHIFTS WHEN COLD OR
HOT - TV PLUNGER/BUSHING ASSEMBLY NOW AVAILABLE - 1984-90 MODELS WITH 4T60
MODELS/YEARS
1984-1990 CUTLASS CIERA - 1988-1990 CUTLASS
SUPREME - 1986-1990 EIGHTY-EIGHT - 1985-1990 NINETY-EIGHT - 1986-1990 TORONADO EQUIPPED WITH
HYDRA-MATIC 4T60 (THM 440-T4) (RPO-ME9)
NUMBER:
90-T-56
CORP.REF.NO: 077106
DATE:
March 1990
SECTION:
4T60
BULLETIN COVERS:
Background and diagnosis information on the throttle valve (T.V.) and governor system that control shift timing and not shift feel. The T.V.
plunger/bushing assemblies will now be available for service. Before the T.V. plunger/bushing assembly is replaced, the entire T.V. system must be
checked. The T.V. SYSTEM may cause one or more of the following conditions:
-
Delayed upshifts (may also be caused by sediment between the governor seat and ball(s).
-
Early upshifts (may also be caused by the governor weight(s) binding on the governor rotor). The rotor is not indexed correctly.
-
No upshifts (may also be caused by sediment between the governor seat and balls).
-
1-2 shift at full throttle only.
-
No full throttle or part throttle detent downshifts.
-
Intermittent second gear starts.
-
Harsh 3-2 downshifts.
Figure 1 - T.V. Plunger/Bushing And Throttle Valve
IMPORTANT:
Some of the conditions listed above could be intermittent or all the time. The T.V. plunger and bushing (308 and 309) may be
worn, allowing sediment to cause the plunger to stick in the bore intermittently. Another concern could be the throttle valve
(311) being stuck down in the bore. Sediment could be the cause of both of these concerns. Either of these conditions could
cause delayed upshifts when the transaxle is cold or hot. (Figure 1)
The listed conditions may be caused by a T.V. cable that is:
-
Improperly set
-
Kinked or binding
-
Disconnected
-
Broken
-
Wrong part
DIAGNOSIS:
^
Check T.V. cable for correct part number, listed in the parts catalog.
^
Check T.V. cable for kinked, binding, disconnected or broken condition.