Have 2019 F150 with the 5.0 engine. The thing gets great millage but sounds like diesel when it's idling. It's supposed to have 12-1 compression and thats half way to being a
diesel. The shop told me some of their engines are that way "typewriter" noise they called it. Anyone else experiencing this.... Still has 6 months left on the warranty. Hasn't gotten any worse in 40,000 miles but is annoying.

 

Timing chains?

 

I suppose it could be but it hasn't changed. The Ford garage will not touch it unless it get worse. Nice guys that they are. Personally it sounds like noisy lifters but who knows.

 

The 5L is normally nosier than you might have heard from older engine you have owned.
Aside from being annoyed, it is not any issue.
Diesels are inherently noisy from way back in time.
In the 5L , it has noting to do with CR.
If you want to reduce the noise level, use an oil additive MOLY M0S2 and give it some time to work.
Noise won't go to nothing but lower substantially after about 5k miles on a weak oil add of 10 oz. repeated at each oil change to keep the effect it should have.
Moly is a Polar crystalline soft metal in Disulfide form that finds it way between the surfaces that make the noise and adds a cushioning effect as well as anti wear properties.
As expected, in loose clearances, noise will be somewhat temperature sensitive due to expansion and contraction that normally take place in any engine.
Good luck.
.

 

The auxillary fuel pump adds to this noisey engine too right?

 

Yes it does.
Mounted on top of the passenger side valve cover and with Rubber slip-on cover.

 

I had a 2012 f150 with the 5.0 and it was so quit you had to put your hand on the hood to make sure it was running.
But that was 8-1 compression. Guess 12-1 with ethanol must give the computer something to do to keep from
knocking...

 

I don't think the 5.0 (even in truck applications) ever had a compression ratio less than 10:1. The first generation coyote engine in the F150's (2011-2014) had a compression ratio of 10.5:1. I've got the 5.0 in my 2013 Mustang and my 2017 F150 and while it isn't the same generation as OPs engine, both of mine are pretty noisy but have been otherwise reliable.

 

The noisy engine is the only thing that I dont like about my truck, 2018 STX 5.0 4x4. I really wish is wasnt, sometimes its just downright embarrassing. My father in law thinks that my engine has a rod knock and I cant convince him other wise. He has a 2019 Silverado that purrs.

 

Fuel injectors can be a little “clicky” on these too, in my experience.