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Check the icm plug with a led testlight for pulse while the engine is cranking. Test the wire connector with the small wires going into the coil for pulse.The v8 has a opti-spark distributor behind the waterpump that is prone to failure. It has the pickup inside it that tells the icm when to spark. If no pulse at icm distributor is bad. If pulse at icm but not at coil, icm or wiring between icm and coil is bad.The coil also needs pos.+ power on 1 terminal to operate. Be SURE to check the security light on the dash. If VATS [vehicle anti theft system] fails its usually within the 2 wires going from the key chip in the ignition tumbler to the body control module. Mine were purple and tan.Trying to start it with the wrong key can put it in lockout mode also. There are bypass modules available online for vats problems or you can even install a resistor in the wire to bypass the keychip part and the door alarms still work.
REPLACE DISTRIBUTOR CAP AND ROTOR.AND PLUGS WIRES.IF GETTING NO SPARK TO PLUGS.CHECK SEE IF IGNITION COIL GETTING POWER.IF NOT CHECK IGNITION FUSE.IF POWER GOING TO COIL.FAULT EITHER COIL IS OPEN OR FAULT IN THE IGNITION MODULE IN THE DISTRIBUTOR.
You have three choices. First, check the spark and coil system to ensure you are getting a spark. Pull off a plug wire from the coil pack and crank. Have someone watch to see sparks snapping off the coil pack. If you don't have any replace the control module under the coil packs.
Second, you may not be getting enough fuel pressure. Put a gauge on the fuel pressure test port. You may have a bad oil pressure sensor, located down above the oil filter. Check that oil pressure sender and make sure the connector is pushed in. The power to the fuel pump runs through the oil sender. If the engine starts and oil pressure doesn't come up quickly, the computer will shut off the fuel pump. Check this and you can also manually engage the fuel pump from the relay block down by the passenger feet.
Third choice, and it's a long shot, check the harmonic balancer and the crank position sensor. If the sensor is bad, the computer has no idea when to fire the spark plugs. A magnet is on the harmonic balancer and flys by a sensor to induce a voltage in the coil and tell the computer what position the crank is in.
did you check the ICM (ignition control module) that's what the coil pack sits on. Inspect if for wire damage and you can remove the ICM and have it tested at Auto Zone or Parts Source free of charge.
Thank you for using FIxya and good luck
Stalling does not sound like an alternator problem. You have concentrated on ignition issues, have you looked at fuel related issues, including fuel filter and injectors? Much, much less likely, but air filter would also come to mind.
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