Has anyone else ran into this issue? Apparently on the 2011-2013 5.0 engines the intake valves can wear away early, causing low compression and misfires. Did Ford use faulty valves in these years? I am helping someone diagnose their 2011 F-150 that developed a misfire on #3, and we come to find that #3 has low compression and doesn't hold air very good in a leak down test. The air is escaping into the cylinder next to it in the leak down test. Took the valve covers off and no broken valve springs and everything looks to be moving as it should. We will measure valve height and lash adjuster tomorrow per the service manual.

Found on the internet. http://www.engineprofessional.com/TB/TB022117-1.pdf

 

Biggest problem with 11-12 5.0 engines that I'm aware of where compression is concerned is related to cylinders out of round. The problem was corrected in late 11 or early 12. Block wasn't formed properly or something along those lines. Never heard of the valve problem but I don't keep up with this sort of stuff like I used to.

Have you done a wet compression test?

 

Yes a wet compression test was done on that cylinder and made no difference. Seems like either valve is hanging open a bit or valve seat is worn. Although the leak down test showed like 85% pressure loss so I would think that it would be 100% if valve was open. I should have a little more info tomorrow.

 

Yeah, I agree, something up with a valve. Considering there's 4 on each cylinder those odds are 4x. There's a tool to connect an air hose directly to each cylinder when you place each being tested at TDC, all valves closed. Listen for air escape at both the exhaust and intake, that'll narrow down the search.

Any further diag on the valve train requires head removal.

 

Update: valve height and lash were measured and everything seems good. Valve cover put back on and we ran sea foam through the intake. We are going to keep running the truck and see if it clears up. Currently looking for a salvage yard engine.

 

If the loss is going to an adjacent cylinder that's the head gasket not valve. don't know if that changes your thought on changing engine or not?

 

Hey everyone, I’ve been having misfire issues on my truck. It’s a 2012 F-150 with the 5.0 and I bought it brand new with 12km. Always have had some knocks with it since about 60000km (40000 miles) at all power settings but mostly idle. I’ve always used full synthetic 5w20 and changed every 5000 km. I always felt the #8 misfire was highly unlikely for me because of that reason, and I’ve never towed or chipped my truck. I could never put my finger on it so I let it go. Then knocking under hard acceleration became common untill I started using premium fuel and injector cleaner. That fixed the knocks for a while with just the odd one and a rough cold idle in winter on -15C and under days. Then around October 2020 when it gets below 0C (I live in Canada) I started getting the check engine light and running rough at idle when cold. Put on the code reader and it’s the dreaded P0308. I changed plugs and swapped coils and still did it. Then I started getting P0300 and P0308. Changed #8 coil and the light came back on. I have a great relationship with my one local Ford dealer, so I gave up and brought it to them. Turns out the compression is low on both banks and it’s not leaking through the rings. They actually said the cylinders are in great shape as they scoped it, so it’s the valves. I was talking with the shop manager and he said it’s a common problem once the 11-13 5.0’s get over 200km and has seen many go before that. He said the valves have been updated to a harder metal and the problem doesn’t seem to be a problem in the Coyotes anymore.

So long story short, yes valves failing are common in our Coyote trucks from 11-13. And once you get past 200000km (130000 miles) it’ll probably need to be fixed one way or another apparently. I’m getting a reman Ford long block put in as it’ll be a Gen 2 motor and the truck is in great shape. Got to say I love the Coyote otherwise!

 

I really hope that is not a common issue, I have 95k miles on mine right now, it's a 2013 and I love the truck, but if there is a significant risk of engine failure then I think I will get rid of it, maybe trade it in on a 6.2 superduty. The truck in my op is my Dads truck, the long block is on the way it had 165k miles on it. I have read on the Facebook groups that people usually get well over 200k miles before any expensive repairs are needed.

 

My 2013 F-150 has 55K miles and began throwing cylinder 7 misfire code. It generally happens at idle.
After changing plugs and coil to no effect, I took compressions. It came in at about 70psi.
Clearly it was either valve or piston problem.
After some research I found out about the bad batch of intake valves, so I removed the heads to check them out.
The picture is what I found. corrosion and excessive wear of the intake valves.
I will be changing them all, and I am on the fence about cutting the seats.

bad intake valve alongside new

 

Just ran across the same issue with one of our work trucks. It’s a 2014 F150 with 318,800 miles. The guy that drove this truck never had any problems, took excellent care, all regular maintenance performed. The truck does not drive like it has this many miles, still runs strong. It idled rough and threw the P304 &P308 codes. Removed the heads and the 4 and 8 intake valves are worn the most, they get better as you come forward. Put two new intake valves in the #8 and vacuum tested them, very little leak down. Thinking about replacing and lapping them all then testing to see if they seal better. Has anyone tried this with any success?

 

Put in all new intake and exhaust valves with a light lapping, the seats looked good with slight pitting on the exhaust seats, also installed new springs and seals. It now runs smooth. Before I started it had P0300, P0315, P0304, P0308 and P0430 codes and idled rough, all the codes went away except the P0315. I’m trying to find a scan tool to do a crankshaft position system relearn (P0315), has anyone come across one?

 

I had a similar problem with my 2014 5.0 would usually set a code on cold start in the morning. After running for 2-3 mins it would idle perfectly. Codes were either miss fire on #4 or random misfires. Changed the plugs, coil checked the injector... etc. one thing I did notice was my fuel trim was high. Compression cold was 78 psi and compression hot was 122 psi. Did a leak down sure enough bad intake valve. I continued to drive it this way for a few months. Then decided to pull the head for inspection. Intake was pounded bad on #4. Took both heads to an engine builder to have them rebuilt. The cost of rebuilding with 3 angle cut was 850.00 Canadian. The truck is back to running super smooth. But.....i thought 2014 was cured of poor-quality intake valves.???

 

​​​​​​Hey man, got a 2014 with the problem on #4.. where in Canada are you? How did you find the guy who fixed it? 850$ sounds like a good deal to fix this up!

 

I'm having the same problem with my 2014 f150. P0308 code. Changed coils and spark plugs then a week later code popped back up. Switched over the fuel injectors to see if there's an issue but I'm thinking it's the intake valve. I'm also in canada and would love to know where you're located that you paid 850 for a rebuild. I was quoted much, much more.

 

The article above just says "during" the 2013 model year Ford corrected the issue. Can anyone here find information on WHEN in the 2013 model year that happened? What was the exact date of production that the fix was being installed on engines?