Pontiac Fiero 1988 Service Manual page 748

HYDRAULIC DIAGNOSIS 125C-7
CONDITION
INSPECT COMPONENT FOR CAUSE
CHATTERS/SLIPS IN 1ST
GEAR
• Oil Level
• T.V. Cable
—
Low.
Not adjusted properly.
Wrong cable.
• Oil Pressure
—
(See causes of high or low oil pres-
sure.)
• Forward Clutch
—
Restricted feed.
Burned clutch plates.
• Driven Sprocket Support
—
Rough machine surface.
• Case Cover Gasket
—
Incorrect gasket.
NO REVERSE OR SLIPS
IN REVERSE
• Forward Clutch
—
Burned clutch plates.
Seal ring off piston.
Exhaust check ball sticking.
• Lo & Reverse Clutch Housing cup plug assembly restricted/
not fully seated.
Leaking seals.
• Lo & Reverse Pipe " O " ring seal damaged or missing.
• Case To Cover Gasket Incorrect (driven sprocket support height
wrong).
Damaged or leaking.
• Direct Clutch
—
Burned plates.
• Lo & Reverse Clutch
—
Burned plates.
• Low Line Pressure
—
Check causes of low line pressure.
NO UPSHIFTS, DELAYED
UPSHIFTS OR FULL
THROTTLE UPSHIFTS
• Manual Linkage
• T.V. Cable
• Oil Level
—
Misadjusted.
Misadjusted, unhooked, bound or broken.
Low.
• Governor
—
Cover worn.
Thrust washer missing.
Governor seal worn or cut.
Governor spring not seated.
Governor weights binding on pin.
Ball missing.
Governor driven gear stripped.
• Intermediate Servo
—
Wrong or sticking .apply pin.
Seals cut, damaged or missing.
Piston sticking or damaged.
Porosity in case servo bore.
• Control Valve Assembly
—
Valves sticking.
Spacer plate gaskets leaking or incorrectly
installed.
• Valve Body Spacer
—
Governor feed orifice to 1 -2 and 2-3 shift
valve plugged.
Drive to governor orifice plugged.
• Intermediate Band Burned or worn.
H 125C-351
Figure 5 Diagnosis Chart