My friend has the same truck as me, 2005 f150 4x4 supercab. We were out this Sunday doing a little off roading. His truck started missing and once he tried to restart it would not.
We could turn the engine over manually. However, the starter could not turn the engine. We pulled his truck to the road and had AAA tow it to his home. I have a mechanic but to be honest, I would like to know a little more, IF this was to ever happen again out on the trail. Maybe a way to clear it? I assume you would need a replacement injector if, this was a bad one. What would you do for the diagnoses?
TIA, B

 

I think if your cylinder was full of fuel you wouldn't be able to turn it over by hand either.
it seems more likely to me that it might be an electrical issue or fpdm problem.

 

I had the problem once on my 1993 5.0.
Had an injector go bad which allowed a lot of fuel in the cylinder at one time.
Fuel eventually seeps past the rings and will crank for a revolution or 2. I was lucky and didn't bend a rod and I didn't know at the time it was hydrolocking.

Only reasons for hydrolocking I can think of is computer not shutting off injector at the proper pulse rate or injector is hung open by having crud stuck in it. Now that I write that, I think that was my problem, the filter had torn and was hanging up the valve in the injector.

Fuel pressure test will be needed. Connect gauge to fuel rain. Turn on the key to allow the pump to run (do not start). Is the gauge steady or is the pressure falling off? Falling off, it's going someplace.....through an open injector.

I suppose if that test passes, you will have to start the engine and witness the fuel pressure readings. If that all passes, it was a fluke, or something else, not fuel, causing a hydrolock. If it was in fact locked up for liquid reasons.
It is possible for it to fuel I'm sure but that's outside of my knowledge base.

 

We could turn it by hand, with a wrench. it would get harder at one point but then was easier. Which is what got us thinking fuel. We turned it several revolutions manually.

 

I think we are going to tow it into the mechanics tomorrow, maybe go from there. We don't have the correct tools to measure readings like fuel pressure and such.
We were just thinking if there was a remedy for something like this out on the trail. Seems like an issue for sure.

 

Popped a rocker arm/cam follower off one of the exhaust valves?

 

Ha, with these engines a lot is possible. We had it towed to the mechanic this am. Once I know what happened, I will post up.

 

Ok, we have an update: It was the injector, cylinder #7. Lucky for us, we decided not to start the engine up on the trail. The mechanic replaced all of the injectors and the coils and the plugs.
We picked up his truck last night. It is running like a top and has very good smooth performance. 8 coils, 8 plugs, 8 injectors. (We figured the injectors were OG, he purchased the truck new, might as well replace all of them).
Plugs and coils had about 50K on them. Oh, did a service, oil and filter and new battery as well.

 

On my 2011 F150, I had a rod blow through the side of the block while I was cruising on the Interstate. Truck had 84,000 miles on it. Ford repaired the engine under warranty and told me it was due to a stuck injector, filling the cylinder with fuel and... Bang. Did all kinds of damage inside the engine.

 

Man, that is crazy. Too bad the injectors cant close when they malfunction.