The dealer did a "relearn" of the transmission and say it's "fixed". They agree that the rattle is likely the wastegate. They are saying "normal" and "within normal operation". SO frustrating as it is so loud and lasts so long. This noise didn't use to be there, and the turbos only have 30k miles on them (new engine and turbos at 68k miles). Are others experiencing this? Any OEM fixes? Other ideas?
I want to drive my Expedition for another 100k miles... but can't stand this rattle.
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ChatGPT offers: Adjusting the electronic wastegate actuator on a 2018 Ford Expedition involves interfacing with the vehicle’s electronic control unit (ECU) to modify its operating parameters or to diagnose and rectify any issues causing malfunction, such as a rattle. This process generally requires specialized diagnostic tools and software, which can communicate with the vehicle’s onboard computer systems. Here’s an overview of the steps involved, bearing in mind that specific procedures can vary depending on the diagnostic equipment used and the exact nature of the problem.
### Preliminary Steps
1. **Safety First**: Ensure the vehicle is parked on a level surface, the engine is turned off, and the key is in the off position.
2. **Equipment Preparation**: Connect a compatible diagnostic tool to the vehicle's OBD-II port, usually located under the dashboard.
### Diagnostic Software Use
3. **Vehicle Identification**: Enter the necessary vehicle information into the diagnostic tool, such as the make, model, and year—2018 Ford Expedition in this case.
4. **Accessing the Turbocharger System**: Navigate through the diagnostic tool’s menu to select the turbocharger or wastegate actuator settings. This might be under engine performance, turbocharger control, or a similar section.
5. **Fault Codes**: Before making adjustments, check for any stored fault codes that might indicate issues with the wastegate actuator or related components. Clearing these codes without addressing the underlying problems can lead to recurrent issues.
### Adjusting the Actuator
6. **Adjustment Settings**: If the tool provides options for adjusting the wastegate actuator, such adjustments might involve changing the parameters that control the actuator's position at various engine speeds and loads. This is a delicate process; incorrect adjustments can negatively impact performance, fuel efficiency, and emissions.
7. **Testing**: After making adjustments, it’s crucial to test the vehicle to ensure that the changes have had the desired effect and have not introduced any new issues.
### Calibration (If Needed)
8. **Actuator Calibration**: Some vehicles may require the wastegate actuator to be recalibrated after adjustments. This process ensures that the actuator's operation is synchronized with the turbocharger and engine requirements.
9. **Final Testing**: Perform a comprehensive test, including a road test, to verify that the wastegate rattle is resolved and the vehicle performs as expected across a range of conditions.
### Professional Assistance
Due to the complexity and precision required in adjusting electronic wastegate actuators, it is strongly recommended to have these adjustments carried out by professionals at a dealership or an automotive repair shop specializing in turbocharged vehicles or Ford models. They will have the most up-to-date software, tools, and training to ensure the adjustments are made correctly and safely.
Attempting to adjust the electronic wastegate actuator without proper knowledge and tools can result in incorrect settings that may lead to poor performance, increased emissions, or even damage to the turbocharger and engine.