Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSMAZDA1991RX-7 BASE, 2D COUPE, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSEMISSION SYSTEMS & SUB-SYSTEMSAIR CONTROL VALVE

1991 Mazda RX-7 Base, 2D Coupe, Automatic

Air Control Valve

1991 Mazda RX-7 Base, 2D Coupe, AutomaticSECTION Air Control Valve

Operate engine to normal operating temperature. Stop engine and install tachometer. On turbo models equipped with Anti-Lock Brake Systems (ABS), disconnect and plug air hose and vacuum hose of air by-pass valve from turbo.
CAUTION: On turbo models with Anti-Lock Brake Systems (ABS), ensure air hose and vacuum hose of air by-pass valve are disconnected and plugged prior to removing air silencer-to-air control valve hoses.
On all models, disconnect air silencer-to-air control valve hose at air control valve. Place finger over air control valve outlet. Start engine and increase engine speed to 3750 RPM on turbo models or 1500-2500 RPM on non-turbo models. Note that air begins to flow at specified RPM.
Operate engine at idle. On turbo models, disconnect relief valve solenoid Blue connector. See Fig 1 . On non-turbo models, disconnect relief valve solenoid-to-air control valve hose. See Fig 1 .
Check that air flows from air control valve outlet at speeds greater than 1200 RPM on turbo models or at idle on non-turbo models. Reconnect vacuum hose or Blue connector.
Remove intake manifold-to-check valve hose. Disconnect hose at check valve on turbo models or intake manifold on non-turbo models. Place finger over opening.
On turbo models, disconnect hose at air control valve. See Fig 2 . On non-turbo models, disconnect hose at switching solenoid valve. See Fig 2 .
With engine at idle, ensure air flows from intake manifold fitting (non-turbo) or check valve (turbo). Replace air control valve if necessary. Reconnect all hoses.

Fig 1: Disconnecting Relief Valve or Switching Solenoid Valve

Courtesy of MAZDA MOTORS CORP.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.