Pontiac Fiero 1988 Service Manual page 749

125C-8 HYDRAULIC DIAGNOSIS
CONDITION INSPECT COMPONENT
FOR CAUSE
NO UPSHIFTS, DELAYED
UPSHIFTS OR FULL
THROTTLE UPSHIFTS
(Continued)
• Case Cover
• Case
— Porosity.
— Undrilled holes.
— Missing cup plugs.
— 2nd oil passage leaking.
— Leaks in governor passage and/or pipe.
— 2nd oil passage leaking.
SLIPPING OR ROUGH 1-2
SHIFT
• Oil Level
• T.V. Cable
• Oil Pressure
• Intermediate Servo
• Intermediate Band
• T.V. Link
• Control Valve Assembly
• 1-2 Accumulator
• Spacer Plate
• Case
• Case Cover
— High or low.
— Misadjusted, unhooked, bound or broken.
— (See causes of high or low oil pressure.)
— Seals cut, damaged or leaking.
— Piston damaged.
— Servo bore in case damaged.
— Apply pin too long or too short.
— Servo orifice bleed cup plug missing.
— Leak between servo apply pin and case.
— Binding servo band apply pin.
— Bent or wrong link.
— T.V. plunger binding.
— Shift T.V. valve binding.
— 1-2 accumulator valve binding.
— Binding 1-2 accumulator piston.
— Broken 1-2 accumulator spring.
— Piston seal or groove damaged.
— 1-2 accumulator bore damaged.
— Incorrect spacer plate or gasket.
— Gasket incorrectly installed.
— 2nd oil passage leaking.
— 2nd oil passage leaking.
2-3 SHIFT ROUGH OR
DELAYED
• Oil Level
• T.V. Valve
® Manual Linkage
• Oil Pressure
• Direct Clutch
• Direct Clutch Exhaust #1
Check ball
• Control Valve Assembly
— Incorrect level.
— Misadjusted, unhooked, bound or broken.
— Misadjusted.
— (Check for causes of high or low oil
pressure.)
— Plugged accumulator exhaust port.
— Mispositioned or missing.
— Binding plunger and throttle valve.
— Binding shift T.V. valve.
2-3 SHIFT SOFT, SLIPS
OR EARLY
• Oil Level
• T.V. Cable
• Manual Linkage
• Oil Pressure
— Incorrect level.
— Misadjusted, unhooked, bound or broken.
— Misadjusted.
— (Check for causes of high or low oil
pressure.)
H
125C-352
Figure 6 Diagnosis Chart