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Home >> Chevrolet >> 1985 >> Chevette L4-111 1.8L DSL >> Repair and Diagnosis >> Transmission and Drivetrain >> Automatic Transmission/Transaxle >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Upshift In D & L2 Only at Full Throttle

Upshift 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.

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