I turn the key and the car starts. i let go of the key after the engine starts and the car dies. after messing around i figured out that if i turn the key and hold it a little below the starting position it will run. the car wont stay running when the key is in the running position. very frustrating. does anybody have a solution
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Seems like a fuel delivery problem.
May be a bad fuel pump, clogged fuel filter or a fuel line problem.
What car make/model? What engine?
When it dies, try to turn ignition off immediately, wait a couple of seconds and turn the key quickly to the crank position (don't wait with the key in ignition-on position so that the fuel pump doesn't try to pump fuel into the fuel lines).
If it hesitates to start or runs significantly shorter before dying, you have pinpointed a problem with the fuel system.
Does it start but the moment you let go of the key it dies? Some cars have a wire from the starter to the ignition coil that provides power during start up. This will let it start but if the circuit from the ignition switch to the coil is not working it will die the moment you let go of the key. Find the positive on your coil and connect a wire from there to the positive of the batery. If it start and keep on running the problem is between your ignition and the coil. Remember the engine will not stop until you remove the wire from the batery.
The ignition switch has two positions inside the switch. There is an ignition feed when the ignition is in the crank position and another feed for the run position.
Both feeds may come out the same external terminal on the switch, but internally there are 2 contact points, one for each positon on the keyswitch.
The common symptom is the engine will hit or run briefly off the startup and then die. It does this because it loses the ignition feed. Not really familiar with the module wiring for a Chrysler, but I was 37 Years old when your car was built. In the day, you could bypass the ignition switch and wire a power source(alligator clip) directly to the coil + terminal and once the car was started it continued to run this way.
Then some nut invented the solid-state Module. It complicates testing and you know the rest.
You can get wiring diagrams free at Autozone.com by registering your car. I remember tuning up the dual-point distributors and the 440 Six-Packs for this era car.
Isince it cranks, means you have power, elctric system is ok! I guess.. this could be a result of gas delivery problem... either a pump or gas circuit controller.... OR a small propable reason if you have an immobilizer (electronic chip on key!)... but there should be the securit key highlithed on dashboard...
Does the car have a factory security system? it may have a starter kill on it. also check for voltage at the starter solenoid while someone holds the key to start position, you could have a faulty ignition switch. the engine light stays on when the key is on until engine starts.
You mean that the starter is turning (cranks) the engine but the engine won't start? Be sure it is getting fuel. Turn the key to the on position and you should hear the fuel pump in the fuel tank run for a few seconds. If so that is good. If the fuel is being delivered then possibly you have no spark which usually is the electronic ignition module. The only way to test it is to replace it. Your timing chain or belt could be broken or "jumped" as the third possibility. I am leaning toward ignition module being bad as they just die without warning and nothing can revive them.
The problem is the new PCM you installed does not have the correct VIN number of your car.
You may be able to relearn the VIN using the preceedure below, however, there is no gaurentee it will work. You may have to have a dealer reset the VIN for you by way of a scan tool.
1) Instert key into ignition and rotate to run position (do not try to start engine)
2) Leave the key in the run position for 10 minutes until security light stops flashing.
3) Turn ignition key to off position for 10 seconds ( no more, no less)
4) Turn ignition to run position again for 10 minutes until security light stops flashing and repeat step 3 and 4 for (1) more cycle.
The process is a security verification step for the VTD system. ( Vehicle Theft Deterent)