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    Starts then dies

    You may want to try the cam position sensor. On my 94 4.0 it was a very easy swap and fairly inexpensive. Looks like a plate on top of the distributor but some live lower inside the distributor and you need to remove it to replace it
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    Diagnosing ECM problems

    So I was able to swap ASD relays and ecu after fully charging the battery and I also installed a new cam CPS. swapping ecu it started right up and ran great. I believe the underlying problem was the CPS, reason being prior to the leaving the key on debacle it wouldn’t start when temp was below...
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    Diagnosing ECM problems

    Swapped ecu and it fired right up. So now to have the old one repaired, maybe find a spare.
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    Diagnosing ECM problems

    spare YJ
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    Diagnosing ECM problems

    Thank you I have a spare you that can swap parts from and I am going to swap out the ecu and see if either one starts…soon as it warms up a little outside.
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    Diagnosing ECM problems

    So I replaced the TPS on my 94 4.0 and accidentally left the ignition on for about 30 minutes and heard a loud clicking coming from the relay box by the battery. Now I have no CEL or buzzing when key turned on, no fuel pump and no spark can I assume the ECM was ruined.jumping across the fuel...
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