S10/T10 Blazer 4WD L4-119 1.9L VIN A 2-BBL (1983)
Fuel Injector: Technical Service Bulletins
Tools - Duel Fuel Injector Tester
Number: 93-127-6E
Section: 6E
Date: MARCH 1993
Corporate Bulletin No.: 316501R
ASE No.: A1, A8
Subject:
INTRODUCTION OF J 39021 FUEL INJECTOR TESTER DRIVEABILITY AND EMISSIONS
Model and Year:
1982-93 S-TRUCK, 1985-93 M-VAN, 1983-93 T-TRUCK, 1990-93 L-VAN AND LUMINA APV
SERVICE UPDATE
This bulletin is being revised to add service manual update reference, to change the model years and vehicles involved.
In January 1993, Kent-Moore shipped to dealers a new Fuel Injector Tester (J 39021). This tool is being shipped as part of the Essential Tool Program.
The Tester will detect intermittent coil failures that may be missed using an ohmmeter alone since the ohmmeter does not load the injector coil with
enough current to detect intermittent coil failures.
The Fuel Injector Tester (J 39021) is capable of testing all major brands of fuel injectors; however, to use this tool with non-GM injectors you will need
the appropriate injector connector adapter and the injector's resistance specifications. Refer to instructions included with tester for additional information
on non-GM applications.
BACKGROUND:
The use of injector cleaners and gasoline blends containing high levels of alcohol may cause fuel
injectors to become faulty. Alcohol may attack the injector's solenoid coil wire and insulation resulting in a shorted or open solenoid coil. Damaged coils
will result in driveability problems due to improper fuel delivery.
COIL TEST DESCRIPTION:
The test procedure also requires the use of the J39200 Digital Volt Meter (DVM). The J39021 Fuel Injector Tester supplies one of three fixed current
values throughout the duration of the test. Selection of a supply current value (0.5, 2.5, or 4.0 amp) is based on the injector's specified resistance. When
the push-to-start-test button is depressed, the tool energizes the injector solenoid coil for five (5) seconds.
The condition of the injector solenoid coil (Pass/Fail) is determined by the voltage reading displayed on the DVM while the injector is energized.
Instructions and specifications are included with the tool.
