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 Duration
Fuel injection duration is basically determined as indicated below:
- While cranking the engine:
The duration defined below is used.
- Duration of fuel injection during engine start-up..... Determined according to the engine coolant temperature detected by the engine coolant temperature sensor.
- During normal operation:
The duration is determined as follows:
- Basic duration of fuel injection x Correction factors + Voltage correction time
- Basic duration of fuel injection..... The basic length of time fuel is injected. This is determined by two factors - the amount of intake air detected by the air flow sensor and the engine speed monitored by the crankshaft position sensor.
- Correction factors..... See the next section.
- Voltage correction time..... This is added to compensate for the time lag before operation of injector that results from variation in the battery voltage.
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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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