Ford Repair Questions? Ask a Mechanic for Answers ASAP
Why was the OD switch replaced? Were there any previous issues with the OD? Is the starter cranking the engine over normally or is it struggling?
OK. In that case, I don't see the engine dying as a direct consequence of turning the OD on. What I would suggest at this point is diagnosing the no-start condition first, then moving on to any issues with the OD.
There are basic checks that need to be done in order to diagnose the no-start. Those include checking compression, fuel pressure, fuel injection pulse and ignition spark - compression and spark can be checked by spraying starting fluid down the throttle; if the engine starts and runs for a couple of seconds, then compression and spark are good, which leaves either fuel pressure or injection pulse as the possible culprit. Can you try starting fluid and see what happens?
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