GM TBI injectors, color codes, and flow rates
These injectors are rated at the pressure used by the factory, about 13 PSI
||1-3/8" bore 2bbl, from 2.8l truck
||GM 5235430 *RPD
||GM 5235203 *RPD
||GM 5235279 *RPD
||GM 5235206 *RPD
||5.7L Cop Car
||Late big block pickup
||GM 1708430 *RPD
|Dark Red/Dark Blue
||big block pickup
||GM 5235231 *RPD
The picture below shows where to look to find the color codes in the injector.
This picture is of a 4.3 throttle body. The injectors have a yellow/blue
color code, each of which is visible on top of the injector.
Mis-Matched TBI injectors
The Throttle Body Injection (TBI) assembly installed on the 1987 4.3L light
duty truck engine uses injectors with DIFFERENT flow rates in each throttle
bore for improved emission control. The TBI units involved are model numbers
17087090 and 17087162. If the injectors are removed for any reason, care
must be taken to make sure they are installed in their proper location.
INJECTOR LOCATION INFORMATION
Throttle Lever Side Bore COLOR-CODED ORANGE AND GREEN
TPS Side Bore COLOR-CODED PINK AND BROWN
- New service package Part Number 17111928
- Remanufactured equivalent Part Number 17111930
Maintained by Brian Koontz, email@example.com
- New service package Part Number 17111929
- Remanufactured equivalent Part Number 17111931
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