Yeah EB haters go ahead and laugh!


So, this is my 6th EB in various vehicles, 2 Flex, 1 MKT, and 3 F150 and this is the very first one that rattles, not when cold as can be found when doing a search, but all the time, in fact, sounds like a Diesel. Rattles increase with RPM, and can be heard while cruising at 80 MPH.

Truck has 32,500 miles on it, has been maintained by the book, but has also been a royal pain in the *** with shop time, front diff rebuilt, even though I rarely used it, vibrations, etc. I don't abuse it either. Did have a mild 5* tune for a while, but found I don't care for it in this truck and removed it 10K miles ago, the last truck I put 63K on it and most of that with a 5* tune and found it enjoyable, and not a single sound out of it.

So what could it possibly be that is rattling? Lifters? HPFP? Definitely top end noise as its twice the RPM and high pitched(?) like valve train. Engine seems to e running good, but uses more gas than my last one by more than I feel it should.

 

Valve train runs at half the rpm of the crankshaft. Could it be a tensioner or idler pulley?

 

It does, but with 12 valves in each head the frequency of rattles is double the frequency of the crank. Like I said, it sounds like a diesel when I accelerate. When I said I wanted another Powerstroke, I meant the actual Diesel engine, not one that sounded like it.

 

Hey acdii, I was doing a little searching and this noise sounds almost exactly what I'm experiencing with mine. Did you come to any conclusions on this? Thanks!

Edit: Sorry for the thread bump! I just realized you're referencing your prior 2016 and not your new 2018.

 

The number of valves has nothing to do with it, 2 intake valves open together, and 2 exhaust valves open together. The cams turn at 1/2 the RPMs of the crank.

 

I know exactly how the engine works, if there are two valves on the intake, then there are also two hydraulic lash adjusters on the intakes, and two on the exhaust, and regardless of the speed, if the adjusters are clacking, they will clack twice as much as a single valve will. That is what it sounded like. I did find out that its the HPFP that was making the noise.

It is now SEP.

 

Since the 2 intake valves (and 2 exhaust valves) open and close in phase, they will make 1 "clack", not 2. This is why I said the number of valves won't make a difference.