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 Control
Fuel control system consists of an electric fuel pump, control relay, fuel filter, 4 fuel injectors, fuel lines, pressure regulator and vacuum switching valve. The injectors are located in the intake manifold and electrically pulsed (timed). The MCU varies the rate of fuel based on engine load information supplied by the data sensors.
The MCU controls the length of time that injectors are open. The pressure regulator receives commands from the vacuum switching valve (VSV), to control fuel pressure. The VSV is located in the engine compartment near the ignition coil. The VSV controls the fuel pressure regulator according to intake manifold vacuum and the MCU.
Because the fuel pressure is precisely controlled, the MCU only has to control the length of time that injectors are open in order to control mixture.
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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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