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Using a mechanic's stethoscope, listen to each injector for normal "clicking" operating noise at idle and under acceleration. To check secondary injectors, disconnect vacuum hose from boost sensor. Start engine and slowly increase speed. Using a mechanic's stethoscope, check that secondary injectors start clicking at 3500 RPM.
If clicking noise is not heard, check the crank angle sensor resistance. Using an ohmmeter, check between the terminals on the crank angle sensor connector. Resistance should be 110-210 ohms between terminals "G1" and "G2" or terminals "Ne1" and "Ne2". See Fig 1 .

Fig 1: Testing Crank Angle Sensor
Courtesy of MAZDA MOTORS CORP.
Check continuity of the wire from crank angle sensor to electronic control unit. If continuity is correct, check resistance of the solenoid resistor.
Using an ohmmeter, check resistance between terminals "FP" and "B" of the solenoid resistor. See Fig 4 . Resistance should be 5-7 ohms. If not, replace solenoid resistor.

Fig 2: Electronic Gasoline Injection System Components (RX7 Non-Turbo)
Courtesy of MAZDA MOTORS CORP.

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.

Safety Warning

Fuel Injectors: Notes