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Like Mr. Barrett stated in his post, the GM TBI injection system is controlled by the ECM, using inouts from the coolant, throttle position and Map sensors to calculate fuel delivery.
I would check the fuel pressure...should be between 9-14 PSI with the key on..I like to see about 12-13....any lower than 9...7-8 psi will allow the engine to run, but will cause difficulty starting cold and stalling on acceleration.
ra11585643 stated:
When you look into your throttle body you should see a butterfly valve, this is your choke plate. It should be open when engine is warm and closed when engone is cold.
TBI is not regular fuel injection. Its not much more than a Carb without a float bowl. Injection takes place of the bowl, check the CHOKE !!!!
Both these statements are false! The Gm TBI unit has an injector above the throttle plate and the air is mixed with the fuel as it passes the throttle plate...there is no choke plate or any other choke type device on this setup.
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