Hello:

I have 2007 Ford F150 FX4 with approx. 170k miles. Love my truck.

One day while in parking lot, going about 3 miles per hour, i hear a loud knocking. i thought it was the car next to me. omg, its my truck. I felt uneasy, sweating, sick to my stomach. Ugh.

I revved the engine and the sound went away. I drove about 5 to 10 miles, and at stop my truck sounded like a diesel! ugh. embarrassing!

I presented my truck to my mechanic. he said "it doesn't sound good" sound from drivers upper engine area. They checked the timing components, etc... Figures crossed that i didn't have to buy a whole new/rebuilt engine/ or do a top end job. stressful.... sick to my stomach again while waiting the results.

Diagnosis: Replace VVT Solenoids, flush engine (clean gunk/oil, sludge); and synthetic oil change. I will pick my truck up tomorrow.

Every truck and issue are different, this is what worked for me. I know this is an ongoing issue with these engines and there are a lot of discussions. i know the knocking could come back, or i may need a new engine etc... but seems to me the main issue was those VVT Solenoids.

Per AI: The 2007 Ford F-150 doesn't have a traditional timing "solenoid" as part of its timing system. Instead, it uses a timing chain to control the timing of the engine. If you're experiencing timing-related issues or if there's a problem with the timing chain, it's recommended to consult with a professional mechanic or refer to the vehicle's service manual for proper diagnosis and repair.

However, if you are referring to the variable valve timing (VVT) solenoid, which can affect the timing of the opening and closing of the engine's valves, here are general steps to replace it:

1. Locate the VVT Solenoid: The VVT solenoid is typically located on or near the cylinder head.
   
2. Disconnect the Battery: Always disconnect the vehicle's battery before starting any work.
   
3. Remove Engine Cover (if applicable): If there's an engine cover, remove it to access the components.
   
4. Remove the Old VVT Solenoid:
   
   • Unplug the electrical connector attached to the solenoid.
   • Depending on the model, you may need to remove other components or brackets to access the solenoid.
   • Use the appropriate tools to carefully remove the VVT solenoid.
5. Install the New VVT Solenoid:
   
   • Install the new VVT solenoid in the same position and orientation as the old one.
   • Reconnect the electrical connector.
6. Reassemble Components:
   
   • Put back any components or brackets that were removed to access the solenoid.
   • Reinstall the engine cover.
7. Reconnect the Battery:
   
   • Reconnect the vehicle's battery.
8. Start the Engine: Start the engine and check for any warning lights on the dashboard.
   
9. Test Drive: Take the vehicle for a test drive to ensure that the VVT system is functioning properly.
   

Remember, these are general steps, and it's crucial to consult the specific repair manual for your vehicle for accurate instructions. If you're not comfortable or experienced with such repairs, it's advisable to seek professional assistance to avoid any potential issues with the vehicle's timing and performance.