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 Injection Control
Injector duration and injector timing are controlled so the optimum air/fuel mixture is supplied to the engine to correspond to continually-changing engine operating conditions. Fuel injection is carried out once for each cylinder for every two rotations of the crankshaft. When the engine is cold or operating under high load conditions, the ECM provides a richer air/fuel mixture by carrying out open-loop control in order to maintain engine performance. When the engine is warm or operating under normal conditions, the ECM controls the air/fuel mixture ratio that provides the maximum cleaning performance from the three way catalyst.
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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.