Mine had chain rattle and it definitely sound like that video... that sounded horrible! My tensioners were definitely in need of change when I pulled it down. the were extended fully and had no more room to keep tension

 

Hoping someone can help with my problem; I am not a mechanic, but like to work on things I consider plug n play, like plugs, coils, oil, tire rotation ect... Several months ago I started to notice a light tapping sound in the engine; now it seems to come and go in intensity. Yesterday, I changed my oil and one coil, when I finished I used my air compressor to clean dirt and dust from the engine. I also removed the air supply duct and filter box from the top of the engine, plugged the intake with a rag and blew the entire area clean. When I finished and started the engine, the engine light came on; I went to a friend who has a device to plug in under the steering wheel and got the following reading: PO345 Position Sensor A Bank 2. I have no idea what this means; can anyone help me?

 

http://www.obd-codes.com/p0345

Camshaft Position Sensor A Circuit Malfunction (Bank 2)

Bank 2 is driver's side.

 

I have 2010 F150 and we are not sure what is the problem. Its intermitttently. Yesterday it di sounds mulitple times and we noticed it did happen while you are slow. In highway its fine. I attached the video below. I hope someone can help me. Thanks a bunch