Therefore, you cannot "set the timing" in the traditional sense. If you're experiencing timing-related issues (like poor performance, misfires, or a check engine light), the problem is almost certainly not a matter of adjusting the timing itself. Instead, you should investigate these possibilities:
* Check Engine Light Codes: Use an OBD-II scanner to retrieve diagnostic trouble codes (DTCs). These codes will pinpoint potential problems. Common culprits include:
* Crankshaft Position Sensor (CKP) issues: A faulty CKP sensor will prevent accurate timing information from reaching the ECM.
* Camshaft Position Sensor (CMP) issues: Similar to the CKP, a faulty CMP sensor disrupts timing.
* Ignition Coil problems: Weak or failing coils can cause misfires, mimicking timing issues.
* ECM problems: A malfunctioning ECM can also lead to incorrect timing.
* Inspect components: Visually inspect the ignition system components including the wires, distributor cap and rotor (if applicable, but unlikely on a 2002 4.7L), spark plugs, and ignition coils for any damage or wear.
* Consider a professional diagnosis: If you're not comfortable diagnosing these issues yourself, take your Durango to a qualified mechanic. Attempting to adjust timing on a modern engine without the proper equipment and knowledge can cause significant damage.
In short, instead of trying to "set the timing," focus on diagnosing the underlying problem causing the symptoms you're experiencing. The timing itself is controlled and managed electronically by the vehicle's computer, and requires diagnostic tools and possibly professional repair to fix any issues.
