C 3500 Truck 2WD V8-454 7.4L (1990)
Throttle Body: All Technical Service Bulletins
TBI Fuel System - Power Curve Information
Number: 93-74A-6
Section: 6
Date: FEB. 1993
Corporate Bulletin No.: 276501
ASE No.: A2
Subject:
PERCEIVED LOW POWER INFORMATION
Model and Year:
1987-93 C/K, G, P, AND R/V TRUCKS WITH 7.4L ENGINES AND THROTTLE BODY INJECTION (TBI) FUEL SYSTEM (VIN N)
THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO. 93-74-7A, DATED JAN. 1993. THE SECTION NUMBER
HAS BEEN CHANGED. ALL COPIES OF 93-74-7A SHOULD BE DISCARDED.
ENGINE APPLICATIONS:
7.4L (RPO L19)
ENGINE VIN (Models):
N
SUBJECT:
Perceived Low Power, 7.4L Engines with TBI Fuel Systems
VEHICLE APPLICATIONS:
1987-93 Model Year C, K, G, P, R, and V Trucks
Some owners with Chevrolet trucks equipped with 7.4 liter throttle body injection (TBI) V8 engines may complain of low power under some road/load
conditions.
Engines equipped with TBI fuel systems respond differently to accelerator pedal positions than those engines equipped with a 4-barrel carburetor. While
a TBI system and a carburetor accomplish the same task, the TBI system maintains a constant air to fuel (A/F) ratio over different road/load conditions
and air flow rates.
