Hi,
What you described sounds like a bad crankshaft position sensor. Often, they will fail when they get hot. Do me a favor. Read through this link and let me know if it seems to mirror what you experience.
https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor
If you feel it does, check to see if there is spark to the plugs when it won't start. If there is no spark, this is my first suspect. Here is a link that shows how to check for spark:
https://www.2carpros.com/articles/how-to-test-an-ignition-system
If you find there is no spark, here is a link that shows in general how to replace the sensor:
https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement
Here are directions specific to your vehicle for replacement:
Pic 1 shows location.
2002 Chevrolet Malibu V6-3.1L VIN J
Crankshaft Position (CKP) Sensor Replacement (7X)
Vehicle Powertrain Management Sensors and Switches - Powertrain Management Sensors and Switches - Computers and Control Systems Crankshaft Position Sensor Service and Repair Procedures Crankshaft Position (CKP) Sensor Replacement (7X)
CRANKSHAFT POSITION (CKP) SENSOR REPLACEMENT (7X)
REMOVAL PROCEDURE
pic 2
1. Turn OFF the ignition.
2. Raise the vehicle. Refer to Lifting and Jacking the Vehicle.
3. Remove the right tire and wheel.
4. Turn steering wheel fully to the left.
5. Disconnect the sensor electrical connector.
6. Remove the attaching bolt/screw.
7. Remove the sensor from engine.
8. Inspect for wear, cracks, or leakage if the sensor is not being replaced.
INSTALLATION PROCEDURE
pic 3
1. Lubricate the O-ring with clean engine oil before installation and replace if damaged.
2. Install the sensor to the block.
NOTE: Refer to Fastener Notice in Service Precautions.
3. Install the CKP sensor attaching bolt.
Tighten
Tighten the bolt to 11 N.m (97 lb in).
4. Connect the sensor electrical connector.
5. Install the right tire and wheel.
6. Lower the vehicle.
7. Perform the CKP System Variation Learn Procedure. See: Vehicle > Programming and Relearning
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I hope this helps. Let me know if you have other questions.
Take care and God Bless,
Joe
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Wednesday, February 10th, 2021 AT 7:04 PM