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 Injector
The SFI fuel injector assembly is a solenoid-operated device, controlled by the PCM, that meters pressurized fuel to a single engine cylinder. The PCM energizes the (12.0 ohms) solenoid to open a normally closed ball valve. This allows fuel to flow into the top of the fuel injector, past the ball valve, and through a recessed flow director plate at the injector outlet. The director plate has four machined holes that control the fuel spray, generating a conical spray pattern of finely atomized fuel at the valve, causing it to become further atomized and vaporized before entering the combustion chamber.
A fuel injector that is stuck partly open or leaking would cause a loss of fuel pressure after engine shut down, so long crank times would be noticed on some engines. Dieseling also could occur because some fuel could be delivered to the engine after the ignition is turned to the Off position.
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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.