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.
Fuel Injectors
The injector nozzles meter and atomize fuel delivered to engine. Injectors are mounted in lower intake manifold and direct fuel just ahead of engine intake valves.
Injector body consists of a solenoid actuated pintle and needle valve assembly. An electrical control signal from EEC-IV module activates injector solenoid, causing pintle to move upward off seat, allowing fuel to flow.
Since injector flow orifice diameter is fixed and fuel pressure drop across injector tip is constant, fuel flow to engine is regulated by length of time solenoid remains energized. Atomization is obtained by contouring pintle at point where fuel separates.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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