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.
Throttle Body Injection (TBI)
Injectors are located in throttle body unit. All models use 220 Series dual injector throttle body. Battery voltage is supplied to injector when ignition is on.
PCM energizes injector solenoid by providing a ground path through its internal circuitry. By regulating injector ground circuit, PCM controls injector "on" time (pulse width) to provide proper amount of fuel to engine. In the "run" mode, PCM uses tach (RPM) signal to determine when to pulse injector. Injectors are pulsed alternately.
Pressure regulator maintains pressure to injector at 9-13 psi (.6-.9 kg/cm2 ). Excess fuel passes through pressure regulator and returns to fuel tank.
NO RELATED
Use the Manual With the Right Hardware
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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.