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Home >> Mazda >> 1988 >> RX-7 Base, 2D Convertible >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - EGI >> System Testing >> On-Vehicle Fuel Injector Operation (Non-Turbo)

On-Vehicle Fuel Injector Operation (Non-Turbo)

  1. Using stethoscope, listen for normal "clicking" sound at each injector during idle and acceleration. To check secondary injectors, disconnect vacuum hose from boost sensor. Disconnect throttle sensor connector.
  2. Start engine and slowly increase engine speed. Using stethoscope, check that operating sound of secondary injectors occurs above 3500 RPM. If clicking sound is not heard, check crank angle sensor resistance, wiring from crank angle sensor to ECU and EGI main fuse.
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