Engine starts & will continue to run only if key
isheld in start position until engine is reved to 2,550 to
3,000RPM. Heater motor does not run until then when the battery
&fuel lights go out. Problem can be bypassed by inpluging ''engine relay''
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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 battery might be low but I doubt it is causing the "no idle" problem. You should have an idle air control valve that the computer uses to adjust idle speed. That valve could be faulty or dirty. Is the check engine light on when the engine is running ?
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.
When the engine dies do the accessories such as radio, lights, heater all die along with the engine; or do they keep running as they were prior to the stall?
If they all quit together (as if the key was shut off) I would check the electrical part of the ignition switch or the battery cables and connections (check both ends of cables and little ground wire near battery that connects to car body). The ignition switches are a well known culprit in the s10's.
If the radio and lights keep running after the stall, I would look at the crank position sensor, ignition coils etc.
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)