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1988
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S15/T15 2WD Jimmy V6-262 4.3L
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Repair and Diagnosis
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Transmission and Drivetrain
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Automatic Transmission/Transaxle
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Testing and Inspection
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Symptom Related Diagnostic Procedures
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3L30 (180/180C) Automatic Transmission
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Upshifts In D & L2 Only at Full Throttle
Upshifts In D & L2 Only at Full Throttle
1. Faulty vacuum modulator.
2. Modulator vacuum line leaking.
3. Leak in vacuum system.
4. Stuck detent valve or cable.