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: Identification
An 8-digit unit identification number is stamped on throttle body assembly for servicing or replacement reference. On Model 220, number is stamped vertically on front of body at Throttle Position Sensor (TPS) side. On Model 300, number can be found on throttle lever side of mounting flange. On Model 500, number can be found on TPS side of mounting flange. See Fig 1 . Letter codes are stamped on throttle body at external tube locations to identify vacuum hose connections.
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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.