Fuel Injection System - TBI: Identification

The throttle body injection identification number is stamped on mounting flange, on throttle lever side. See Fig 1. Alphabetical code letters are stamped on the throttle body at external tube locations to identify vacuum hose connections.

All Astro, Safari and "S" series vehicles use either the model 220 or model 700 TBI unit. The "R" and "V" series use the model 220 TBI unit. All "G" series vans and "P" series trucks use the model 220 TBI unit.

Fig 1: Throttle Body Identification Location

Courtesy of GENERAL MOTORS CORP.