This test will tell you if the computer system has operating voltage and injector trigger signal?

HEDP203

MEMBER
1987 FORD F-150
V8
2WD
AUTOMATIC
61,000 MILES

Test fuel injector pulse and supply voltage output (test is used for most cars). This test will tell you if the computer system has operating voltage and injector trigger signal. Remove an electrical connector from a fuel injector (it doesn't matter which injector) probe both sides of the connector with a grounded test light (there are only two terminals). Have a helper turn the key to the "on" position without cranking the engine and observe the test light. The test light should illuminate one side of the connector only.
(I am getting a light on both sides of connector) please help what should I look for?

3 Replies

RASMATAZ

MECHANIC
75,992 POSTS

This guide can help you test the fuel injector signal

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Please go over this guide and report back.

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Wednesday, February 17th, 2010 AT 2:37 PM

HEDP203

MEMBER
2 POSTS

Ok so heres where im at. The truck sat for about 6 years with a 1/4 tank of gas.
I siphoned as much out as I could and added 5gal of good fuel to it. It ran fine @ idle (no insurance yet so couldnt drive the street) for a while. Then it started to sputter and miss. So since then I have replaced the fuel tank, in tank sending unit, high pressure pump on frame, fuel filter, plugs, wires, cap, rotor.
When I switch the key to the on position the fuel pressure reaches 42psi +-, and with a test light connected to the positive battery terminal and to #1 fuel injector harness, then crank engine and it blinks, indicating pulse. My injetors ohm out correctly however the truck will not start. But will run on starter fluid. Any ideas? I dont know what else to check?