For owners and technicians working on a 1999 Dodge with a 5.9L gas engine, encountering issues while using a scan tool is not uncommon, especially when diagnosing engine timing and distributor-related problems. One crucial aspect often overlooked is the distributor position and its correct synchronization with the engine’s computer (PCM). This article provides a guide on how to check the distributor position on your 1999 Dodge 5.9L gas engine using a diagnostic scan tool, addressing potential “1999 Dodge 5.9 Gas Scan Tool Issues” related to this procedure.
Ensuring the distributor is correctly positioned is vital for proper engine performance. While ignition timing is controlled by the PCM, the distributor’s rotational position is critical for fuel synchronization. If the distributor is not correctly aligned, it can lead to various drivability problems and potentially trigger diagnostic trouble codes that a scan tool can help identify.
Checking Distributor Position on a 1999 Dodge 5.9L Gas Engine
To accurately check and adjust the distributor position, you will need a DRB scan tool or an equivalent professional-grade diagnostic scanner capable of accessing the PCM and displaying relevant data. Here’s a step-by-step guide based on factory service procedures:
Preparation
Before you begin, ensure the engine is in good running condition and capable of reaching operating temperature. You will need to access the distributor and the diagnostic data link connector (DLC), typically located in the passenger compartment, below and to the left of the steering column.
Scan Tool Connection
- Connect the Scan Tool: Plug your DRB scan tool into the data link connector of your 1999 Dodge 5.9L gas vehicle.
- Navigate to SET SYNC Screen: Power on the scan tool and navigate through the menu to find the “SET SYNC” screen. This function is specifically designed to display distributor synchronization data. Refer to your scan tool’s manual for precise navigation steps.
Performing the Check
WARNING: This procedure requires the engine to be running. Exercise extreme caution to avoid moving engine components such as fan blades and belts. Ensure no loose clothing is near moving parts.
- Start and Warm Up Engine: Follow the on-screen prompts on your scan tool and start the engine. Allow the engine to reach its normal operating temperature and enter “closed loop” mode. This is crucial for accurate readings.
- Observe Scan Tool Display: With the engine idling, observe the “SET SYNC” screen on your scan tool. Ideally, the display should show “IN RANGE” along with “0°”. This indicates that the distributor position is correctly synchronized.
Interpretation and Adjustment
- “IN RANGE 0°”: This is the optimal reading, confirming correct distributor positioning and fuel synchronization.
- “+” or “-” with a Degree Value (Not Zero): If you see a plus (+) or minus (-) sign next to a degree value that is not zero, or if “IN RANGE” is not displayed, it indicates the distributor position needs adjustment.
- Adjustment Procedure:
- Loosen Distributor Clamp Bolt: Carefully loosen the distributor hold-down clamp bolt, just enough to allow rotation of the distributor housing. Do not remove the bolt completely.
- Rotate Distributor: Gently rotate the distributor housing while observing the scan tool screen. Rotate until “IN RANGE” appears and the degree value is as close to 0° as possible.
- Tighten Clamp Bolt: Once the desired reading is achieved, tighten the distributor hold-down clamp bolt to the specified torque of 22.5 N·m (200 in. lbs.).
- Re-verify Reading: After tightening, re-check the “SET SYNC” reading on the scan tool to ensure the adjustment is maintained.
Understanding Scan Tool Readings and Distributor Function
It’s important to understand that the “SET SYNC” reading on the DRB scan tool refers specifically to fuel synchronization and not ignition timing. Rotating the distributor will not affect ignition timing, which is entirely controlled by the PCM. The distributor’s role in this system is primarily for camshaft position sensing, which is crucial for sequential fuel injection.
If you are experiencing “1999 dodge 5.9 gas scan tool issues” when trying to perform this procedure, ensure:
- Scan Tool Compatibility: Your scan tool is compatible with the 1999 Dodge 5.9L gas engine and has the functionality to access the “SET SYNC” screen.
- Engine Conditions: The engine is at operating temperature and in closed loop mode.
- Connections: All scan tool connections are secure.
Conclusion
Proper distributor position is a critical factor in the overall performance of your 1999 Dodge 5.9L gas engine. Using a scan tool to check and adjust this position, when necessary, can resolve various engine performance issues and ensure accurate fuel synchronization. By following these steps, you can effectively address potential “1999 dodge 5.9 gas scan tool issues” related to distributor alignment and maintain the optimal operation of your vehicle. Always refer to your vehicle’s service manual and scan tool documentation for specific instructions and safety precautions.
