4.3L, S/T, M/L J 39021-301 allows for testing of the individual
injectors on the 1996 4.3L engine. The harness is used with the J
39021-210 Injector Selector Switch Box and the previously essential J
39021 Injector Tester. It attaches at the main fuel harness connector
and allows pressure to drop and coil tests to be performed.
Used with: J-39021 and J-39021-210
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