Will turn over but no start

BOSTEN TUCKER

MEMBER
2002 DODGE DURANGO
4.7L
V8
4WD
AUTOMATIC
160,000 MILES

I drove my vehicle to work one day and I sat in the parking lot for a minute letting my truck idle. Then it shut off. Then I tried starting it and would not turn back over. I waited a minute I started it back up fine. After work I tried to start it and it would not start and has not started since then. I got a catalyst bank one code coming up. Assuming from trying to start the truck with no spark it is causing pollution. I checked the spark plugs today and I had no spark. Cannot find an answer on why I have no spark. No spark on coils.

1 Reply

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Hi and thanks for using 2CarPros.com.

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

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

Here are general directions for replacing one:

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

Here is a link that discusses what you are presently experiencing and how to check and repair:

https://www.2carpros.com/articles/car-cranks-but-wont-start

If you have a live data scanner, plug it in and check if there is an RPM reading when the engine is cranking. If there is no reading, the sensor is my first suspect.

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If you determine the sensor is the problem, here are the specific directions to replace it for your vehicle. The attached picture correlates with these directions, showing location. If you cannot tell by the picture, it is located on the engine block side, passenger side, rear of the engine.

REMOVAL
The Crankshaft Position (CKP) sensor is located at the right-rear side of the engine cylinder block. It is positioned and bolted into a machined hole in the engine block.
1. Disconnect CKP electrical connector at sensor.
2. Remove CKP mounting bolt.
3. Carefully twist sensor from cylinder block.
4. Remove sensor from vehicle.
5. Check condition of sensor O-ring.

INSTALLATION
1. Clean out machined hole in engine block.
2. Apply a small amount of engine oil to sensor O-ring.
3. Install sensor into engine block with a slight rocking action. Do not twist sensor into position as damage to O-ring may result.

CAUTION: Before tightening sensor mounting bolt, be sure sensor is completely flush to cylinder block. If sensor is not flush, damage to sensor mounting tang may result.

4. Install mounting bolt and tighten to 28 Nm (21 ft.lbs) torque
5. Connect electrical connector to sensor.

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I hope this helps. Let me know if you have problems or need additional information.

Take care,
Joe

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