Diesel Data
: Automotive Repair
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1988
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S10/T10 Blazer 2WD L4-151 2.5L
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Automatic Transmission/Transaxle
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Symptom Related Diagnostic Procedures
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3L30 (180/180C) Automatic Transmission
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No 1-2 Upshift In D & L2
No 1-2 Upshift In D & L2
1. Stuck
governor
valves.
2. 1-2 shift valve stuck in first gear position.
3. Leaking seal rings in oil pump hub.
4. Excessive leak in
governor
pressure circuit.
5. Clogged
governor
screen.