Stalls when hot and will not restart

KTMASH

MEMBER
1999 DODGE RAM
8.0L
V10
2WD
AUTOMATIC
240,000 MILES

Hello, I am having an issue with my truck, it will start up great and idle good until it has ran for about thirty minutes or about fifteen minutes of driving. Then it will shut off and will do nothing more then crank over until it has cooled off, then it will fire right back up.
This did not start happening until I had gone in to replace the thermostat which I am confident is unrelated because it runs at temperature like it should and does not overheat. However, the alternator positive lead did get arced from a ratchet and I am being told I fried my ECM. I am looking for any other suggestions before I spend all that money. I have checked fuses and swapped all the relays I can think of that have to do with the truck running to no success.

Before this issue started it had new:
Coils
Wires
Plugs
Air filter

After this issue started I have replaced:
Fuel pump
Battery
Alternator

I will attach a video demonstrating the issue the check engine light in the video was self induced to make sure it was storing codes properly and has since been fixed and there is currently no check engine lights.

Video (Click to make bigger)

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,407 POSTS

Hi and thanks for using 2CarPros.

Charging is regulated via the ECM; however, if you hit the power supply to it, that shouldn't have damaged the ECM unless you shorted the supply to one of the ECM terminals.

With that being said, what you are describing sounds like a typical crankshaft position sensor problem. Take a look through this link:

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

The easiest way to test one is with a live data scanner. Basically, if it stalls and doesn't restart right away, you won't have an RPM signal. Also, it will cause the ignition to lose spark.

Here is a link that shows in general how a sensor is replaced:

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

Here are the directions for replacement specific to your vehicle. The attached pictures correlate with these directions.
________________________________________________________________________
Crankshaft Position Sensor Location
See pic 1

The crankshaft position sensor is located on the right- lower side of the cylinder block, forward of the right engine mount, just above the oil pan rail.

REMOVAL
1. Raise and support vehicle.
2. Disconnect sensor pigtail harness from main engine wiring harness.

Sensor Removal/Installation

3. Remove sensor mounting bolt.
4. Cut plastic tie strap securing sensor pigtail harness to side of engine block.
5. Carefully pry sensor from cylinder block in a rocking action with two small screwdrivers.
6. Remove sensor from vehicle.

Sensor O-ring

7. Check condition of sensor O-ring.

INSTALLATION
1. Apply a small amount of engine Oil to sensor O-ring.
2. Install sensor into cylinder 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.

3. Install mounting bolt and tighten to 8 Nm (70 in. lbs.) torque.
4. Connect sensor pigtail harness to main engine wiring harness
5. Install new plastic tie strap to secure sensor pigtail harness to side of engine block. Thread tie strap through casting hole on cylinder block.

_______________________________________

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

Take care,
Joe

Images (Click to make bigger)