Hello, just wanted to say I bought a 2007 tundra with 5.7.

I went out one morning and started it.never herd much until it idled down. The motor sound like a desiel.i read alot of peoples opinions. From what most said it was a timing chain tensioner, primary bank 1.i watch a video where the truck made the same noise as mine. On the video they changed it out and it was fine. The part is reasonable but alot of work to strip it down. I went to Canadian tire bought a can of seafoam. I then poured half into my oil.its been 3 days now and never heard again so far. I just figured I would let you know if you are having the same problem. Hopefully it will work for you like it did for me.my truck is running very smooth and quiet. It also has 275000klm on.it is running as smoothly as a brand new one. Hopefully it stays that way.

 

Welcome. Gotta love the Seafoam when it works.

 

Welcome from CO!

 

My uncle told me to try it. He said it won't hurt to try. I was very surprised with it.i drove it for 30 minutes and parked it over night and never herd it again.it was doing it all the time when idle down

 

Welcome from NY.

 

Good deal. I hope it lasts for you.

 

Welcome.

The 5.7 in my 2007 has 297,000 miles and it sounds like a diesel. I'm not too concerned about it, but sometime soon I will remove the serpentine belt and see what noise remains.

 

Welcome from LA (Lower Alabama)!

 

Thank you

 

Welcome from Ontario Canada.

 

Welcome, mine does it every morning but goes away since 2012.

 

My 2013 does the same on "cold" California mornings. I was planning to change the belt and have come across recommendations to change the idler and tensioner pulleys along with the belt, 145k miles on the truck. any advice would be greatly appreciated!