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 System - TBI: Description
The throttle body fuel injection system consists of 7 major sub-assemblies: fuel supply system, throttle body assembly, Idle Air Control (IAC) System, Electronic Control Module (ECM), Electronic Spark Timing (EST), data sensors, and emission controls. Fuel is supplied to the engine through electronically pulsed injector(s) located in the throttle body assembly on top of intake manifold. The ECM controls the amount of fuel metered through the injector(s) based upon engine demand.
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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.