Question about 2000 Ford Explorer
You can divide your problems into 2 groups. The group that triggers Codes from the onboard computer and the group that does not. I am anticipating that you did not have Codes or you would have mentioned it.
When you turn on your ignition, you activate Relays. The relays connect the circuits which can be fused. But it you can restart the car, the fuses did not break. It does not mean the Relays did not fail and lose their connection once they were bumped or heated up.
The power then goes through the wiring and to the connections of the component parts. A defect at the plug-in connectors can also fail to provide power to the component and in your case, intermittently.
Pulling apart connectors without breaking their snap-locks and using a little WD-40 could remove any corrosion in the pin connectors.
After that, its the wiggle test or the unknown component must fail completely. There are a couple of tests like fuel pressure and the Noid tests of the fuel injector circuit. The spark circuit like the coil is not like the old days. You can have 2 coil-paks or 8 coil on spark-plug sets. Durability is better.
Without the Vehicle setting a Code, an intermittent problem is very hard duplicate. An overheating fuel pump can fail like this, but the Fuel Relay is cheaper and can also act like this. The Ignition Relay can overload and cut off the spark. The bigger, more expensive parts like the PCM can short internally.
Be persistent, don't put your fingers too close to moving belts, and try the wiggle tests.
Posted on Oct 22, 2013
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Posted on Jan 02, 2017
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