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Home >> Mazda >> 1994 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Diagnosis - N4A-El/Hl & NC4A-El >> Trouble Shooting >> Line Pressure Test Results >> High At Idle

High At Idle

Leaking or disconnected vacuum line, leaking vacuum diaphragm, or stuck pressure regulator valve.