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 Injection (TBI) system is a single injector system that introduces fuel into the throttle body from above the throttle plate. The injector, located within the throttle body, is controlled by the Electronic Control Unit (ECU).
The ECU is a sealed microprocessor that receives input signals from several sensors and other related engine components. Based on these inputs, the ECU generates output signals that control and adjust air/fuel mixture and ignition timing as necessary to optimize engine performance.
The ECU also controls engine idle speed, emission control systems, the upshift indicator light (manual transmission only), and the A/C compressor clutch.
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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.