brian,
Its sounds more like a bad connection in the wiring harness than it does a bad fuel
injector. Did you individually check each fuel injector with 12 volts DC?
I individually checked each injector with 12 volts when i wasnt sure if it was an
injector problem:
1. Relieve the fuel pressure by removing your fuel pump relay. (its in the power
distribution panel next to your window washer bottle. ) Now start the truck and let it
run till it stalls. Then start the truck again. It should stall again. Try to start
her one more time. now leave the relay out of panel.
2. VERY CAREFULLY disconnect the fuel injector electrical connector from the body of the
fuel injector itself. use a tiny screwdriver to pry the tabs up just enough to slide off
the electrical connector. be careful cause it may break. the plastic is brittle.
3. What you should see is 2 metal contacts on the fuel injector. Connect one of the
contacts to the battery (+) terminal and the other contact to the battery (-) terminal.
NOTE 1: ONLY HAVE THE INJECTOR ENERGIZED FOR 1 SECOND --=MAXIMUM=--
Any more than 1 second at a time and you could burn out the coil in the injector.
NOTE 2: DO NOT CROSS THE JUMPER WIRES YOU ARE USING FOR THIS TEST.
If you accidently cross the two jumper wires they will immediately glow bright red and
the insulation of the wires will burn off. And you may get a burn if you happen to be
holding the wires. When I ran the test I used 6 ft. long 18 gauge jumper wires with
small insulated aligator clips at each end. ( Each aligator clip had the little rubber
boot on them. ) This made is somewhat safer to run the test with. The alligator clips
should be small enough to grab the electrical contacts of the injector without slipping
off the contacts.
4. You should hear a distinct, loud, "CLICK" each time you energize the injector.
You should compare the "click" sound to the other 'good' injectors on the engine. That
way you will know what a "good" one sounds like. Its a distinct "click" sound. Also if
you have a free finger while your doing the test, you can put the ball of your finger
on the injector body and 'feel' the click as well as 'hear' the click. After a while
you will get to know what a good injector ought to be doing.
5. I would make an injector click about 10 times each. Be sure to wait a few seconds
between each click. If you think you found an injector that is not "clicking" each and
every time you energize it, or it doesnt sound right, there may be a problem with it.
6. BUT.... If you find no differences in the way all the injectors "click" , then
try checking further up the wiring harness. Try checking any other connectors in the
harness. Then check the PCM connector itself.
7. When youre done with the injector tests, put the fuel pump relay back into the power
panel, be sure to re-connect all the injectors back up, and start the truck to get the
fuel pressure back up to normal.
-dan
Dan K.
'92 Grey Dak CC, 318, 4x2, 46RH, 3.55 rear, 235/75R15, PS, PW, PB, PL, AC.
Mods: Cool air, K&N oil/air, Autolite 3924s, re-located IAT.
Future: Swap motor for a slightly modified Magnum 5.9L engine.
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