Not getting fire to sparks plugs, cranks will not start

The most common cause of a spark loss is the crankshaft position sensor. Take a look through these links:

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

Here is a link that explains in general how one is replaced:

https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

The best thing to do, if you can, is get your hands on a live data scanner. When it is plugged in, crank the engine and check to see if you have an RPM signal. If there is no signal, the sensor is where I would start. Also, while the scanner is attached, check for diagnostic trouble codes.

If you find the sensor is the problem, here are the directions specific to your vehicle for replacement. The attached pic correlates with the directions.

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2007 Chrysler Pacifica V6-4.0L VIN X
4.0L
Vehicle Powertrain Management Sensors and Switches - Powertrain Management Sensors and Switches - Computers and Control Systems Crankshaft Position Sensor Service and Repair Removal and Replacement Crankshaft Position Sensor Removal 4.0L
4.0L
4.0L

pic 1

The crankshaft sensor is located on the driver side of the vehicle, above the differential housing. The bottom of the sensor sits above the drive plate.

1. Disconnect negative battery cable.

2. Unlock and disconnect electrical connector from crankshaft position sensor.

3. Remove sensor mounting screw. Remove sensor.

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Let me know if this helps or if you have other questions.

Take care,
Joe