Would a crankshaft sensor cause 1997 Ford Explorer to start starts intermittently.?

Yes, a faulty crankshaft position sensor (CKP sensor) can absolutely cause a 1997 Ford Explorer to start intermittently. The CKP sensor tells the engine's computer (PCM) where the crankshaft is in its rotation. Without this information, the PCM can't properly time the fuel injection and ignition, leading to a no-start or hard-start condition. Intermittent problems are particularly common with failing CKP sensors as the internal components degrade.

Other things to consider if it's not the CKP sensor:

* Cam Position Sensor (CMP): Similar to the CKP, a faulty CMP sensor can also cause intermittent starting problems.

* Battery/Alternator: A weak battery or failing alternator can prevent enough power for the starter motor to crank.

* Starter Motor: The starter itself could be failing.

* Ignition Switch: A malfunctioning ignition switch might not be supplying power correctly.

* Fuel System: Issues with the fuel pump, fuel filter, or fuel injectors could also cause intermittent starting.

While the CKP sensor is a likely culprit, you'll need to have a mechanic diagnose the problem properly. They can use a scan tool to check for any diagnostic trouble codes (DTCs) that might point to the faulty sensor or other issues.