Check engine light

Welcome to 2CarPros.

It sounds like it is heat related. Does it do this when cold? The flashing check engine light indicates a misfire. The first thing that comes to mind is a crankshaft position sensor. When they start going bad, heat affects them. Take a look through these links and let me know if it seems to mirror what you are experiencing.

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

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

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If this seems like the problem. Here is a link that shows in general how it's replaced:

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

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Here are directions specific to your vehicle for replacement. The attached pictures correlate with the directions.

2006 Jeep Truck Liberty 4WD V6-3.7L VIN K
Procedures
Vehicle Powertrain Management Sensors and Switches - Powertrain Management Sensors and Switches - Computers and Control Systems Crankshaft Position Sensor Service and Repair Procedures
PROCEDURES
REMOVAL

pic 1

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

INSTALLATION

pic 2

1. Clean out machined hole in engine block.
2. Apply a small amount of engine oil to sensor O-ring (3).
3. Install sensor (2) into engine block with a slight rocking and twisting action.

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 (1) and tighten to 28 N.m (21 ft. lbs.) torque.
5. Connect electrical connector to sensor.
6. Lower vehicle.

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Also, I strongly recommend having the computer scanned to identify diagnostic trouble codes. Most parts stores will do it for free.

Let me know what you find.

Joe

Welcome back:

I understand what you are saying. Have you retrieved diagnostic trouble codes? There could be more than just a misfire code. If you have, let me know what they were. Also, some general questions. Have you checked fuel pressure or have you checked to make sure there are no vacuum leaks?

Let me know.

Joe

Welcome back:

I will watch for your reply. If you decide you want to check for vacuum or fuel pressure issues, here are a couple links you may find helpful:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Take care and have a good weekend.

Joe

Welcome back:

That's a cylinder 1 injector. If the injector doesn't fix the issue, check for power to the injector. See pic 1 Let me know what you find.

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Here are the directions for replacing the injector. Thought I would add them.

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2006 Jeep Truck Liberty 4WD V6-3.7L VIN K
Fuel Injector
Vehicle Powertrain Management Fuel Delivery and Air Induction Fuel Injector Service and Repair Procedures Fuel Injector
FUEL INJECTOR
REMOVAL

pic 2

1. Remove fuel rail.
2. Disconnect clip(s) (2) that retain fuel injector(s) (3) to fuel rail (4).

INSTALLATION

pic 3

1. Install fuel injector(s) (3) into fuel rail assembly (4) and install retaining clip(s) (2).
2. If same injector(s) is being reinstalled, install new O-ring(s). Two different O-rings are being used. These can be easily identified by color. Install black O-ring at intake manifold end of injector. Install red/rust colored O-ring at fuel rail end of injector.
3. Apply a small amount of clean engine oil to each injector O-ring. This will aid in installation.
4. Install fuel rail.
5. Start engine and check for fuel leaks.

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Make sure to replace the o-rings on the injector as well. I always lubricate them with a small amount of Vaseline before I install them. It helps prevent damage to the o-ring.

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Let me know how things turn out for you.

Take care,
Joe

That's great news and you are very welcome. I'm glad it's going again. And I agree with you. Chances are the injector was fine. Regardless, it's fixed.

Take care and let us know if you have questions in the future.

Joe