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Did you check the temp sw by the thermostat housing it feeds the ecm on one side and the temp on the other. There is also one in the side of the head on the left bank but it only checks temp.
Down deep in the distributor there is a pickup coil did anyone check or replace it ? I find its easier to pull the distributor but mark position first.. then replace the pickup coil in the distributor.. that's about last thing to replace sounds like you have done the others.
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How long since a tune-up?
Check for applicable trouble codes, if there are any? Your obd 1, you should be able to check for some codes, if the mil still works.
Check primary voltage at the coil, pink wire, key on. Use a test light to check for voltage.
The spark plugs--plug wires--dist cap and rotor all good? Does the rotor turn when you crank it? If you take coil wire loose from distributor cap and hold close to engine ground, have helper crank it, do you see a spark jump? I don't know what testing you have done?
With bypass ignition it's the ignition module that controls spark during cranking. With the coil itself, key on, should be voltage on both sides, if only one side, the coil is faulty. The ground for the coil should pulse, with engine cranking. I'm sure I've left something out? You need to do some testing.
If the ignition coil, crank sensor,ignition ,module ,cap and rotor are new then possibly a bad pick up coil inside the distributor bad ignition coil wire from dist. to coil or missing power supply
Visual inspection to confirm dist rotor is turning. Check pick up coil under rotor, 2 small wires, green and white tend to break, pull on them slightly to check. The rotor can burn thru and short to ground. try these.
First does the rotor turn when cranking engine?? possible timing chain is out or stripped gear..are you sure it has no spark??did you verify this with a high output spark tester ? did you spray starting fluid in the tbi unit ?
WHAT I WOULD DO IS TEST THE FUEL PRESSURE SOME TIMES THE PUMP WILL PUMP ENOUGH FUEL TO GET TO THE TBI BUT NOT ENOUGH TO FIRE THE TRUCK. IF FUEL PRESSURE IS GOOD REMOVE THE DISTBURTOR CAP AND INSPECT THE CAP AND ROTOR, CHECK FOR CORROTION N EITHER ONE SOME TIMES IS BUILDS UP AND STOPS THE SPARK. GIVE THAT A TRY GOOD LUCK HOPE THIS HELPS.
There are 3 possibilities. 1 the coil. 2 the ignition module. 3 the pick up coil. In my experience the ignition module is the most common cause. It is in the distributor held in with 2 screws. The coil and module can be tested at any parts house. Good Luck
the starter could be too close to the flywheel. try adding a couple of starter shims. it also could be drawing to many amps from internal corrosion from water intrusion.
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