* Crankshaft Position Sensor (CKP): This sensor tells the engine's computer where the crankshaft is. A faulty CKP sensor can cause the engine to stall unexpectedly, especially under load. The delay before restarting is consistent with the sensor cooling down.
* Cam Position Sensor (CMP): Similar to the CKP sensor, a faulty CMP sensor disrupts the engine's timing. It can lead to stalling and difficulty restarting.
* Throttle Position Sensor (TPS): This sensor tells the engine computer the throttle's position. A faulty TPS can cause erratic engine behavior, including stalling.
* Mass Airflow Sensor (MAF): This sensor measures the amount of air entering the engine. A dirty or faulty MAF sensor can cause a lean condition, leading to stalling. Try cleaning it first (with MAF sensor cleaner only – don't use anything else) before replacing it.
* Ignition System Issues: Although less likely given the electricity remains, a problem with the ignition coil, ignition module, or spark plugs/wires could be intermittently causing a loss of spark.
* Wiring harness issues: A short or corroded connection in the engine's wiring harness could be creating an intermittent interruption in the electrical signal to one of the sensors or components listed above.
Troubleshooting Steps:
1. Check engine codes: Use an OBD-II scanner to read any diagnostic trouble codes (DTCs) stored in the vehicle's computer. This is the most crucial first step. The codes will point you directly to the most probable culprit.
2. Inspect the sensors: Visually inspect the CKP, CMP, TPS, and MAF sensors for any obvious damage or loose connections. Consider replacing them one at a time based on the OBD-II codes (if any) or their visible condition.
3. Clean the MAF sensor: Carefully clean the MAF sensor with MAF sensor cleaner. A dirty MAF can cause similar symptoms.
4. Check the ignition system: Inspect the ignition coil, ignition module, spark plug wires, and spark plugs for any signs of wear, damage, or corrosion.
5. Check fuel pressure: Even though you replaced the fuel pump, it's worth verifying that fuel pressure is adequate. A faulty fuel pressure regulator could be causing the problem. This requires a fuel pressure gauge.
6. Professional Diagnosis: If you're uncomfortable working on the car yourself, take it to a mechanic experienced with Jeeps. They have the tools and expertise to diagnose the problem more efficiently.
Replacing parts randomly is costly and inefficient. Diagnosing the problem systematically, starting with the OBD-II codes, is much more effective.
