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Is the check engine light always off when this issue occurs here?
Let me know so we can continue,thanks Pete.
O.k.,the power and ground signals need tested at the engine computer when this occurs.if you have the correct power and ground signal but the check engine light is not on and there is a no start issue then this is the engine computer itself at fault.The engine computer controls the engine light.It should always come on every time the key is switched on.Since it is not coming on I suspect either an intermittent wiring/connection fault to the engine computer or the engine computer itself is at fault internally.Most of the time it is internal to the computer with it needing replaced.
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There is no common area.I would inspect the wiring running to and at the computer for any issues needing repaired or replaced.You can unplug the computer as well with the key off and check for any damaged pins in the connectors.
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I apologize for the delay.
The only thing I see here is damaged wiring or connections at the ignition switch itself or an issue with a short leading to the ignition switch causing this fault here.This would be the only other thing I can think of that can cause this here.
Since you had removed and reconnected the computer and the issue corrected itself temporarily this does sound like an internal electrical fault in the engine computer itself.It may have just been the slight movement at the computer when disconnecting and connecting it that allowed the brief start times.I have seen some computers act up like this here before and had to replace and program the computer to resolve this here.