I have a 2001 ford f150 supercrew 5.4 liter v8 engine 4X4. We recently replaced the intake manifold about 3 or 4 months ago. It had had a cylinder 4 misfire for the longest time now. We have change the park plugs and the coil packs on every cylinder. It went away and came back shortly after. We couldn't figure out what it was but then another problem occurred. Now I I drive it for more than 15 minutes, the engine temperature gage goes all the way up to hot and spews antifreeze out the resivior cap. We've changed the thermostat 2 times an the resivior cap and it still did it. Then we thought there could be some air pockets in there from when we changed the manifold. So we've been running it with the cap off of the coolant resivior and squeezing the hoses and inside the resivior air bubble keep popping up ten they would stop so we thought we fixed it. It worked good for a while then it started spewing antifreeze again and over heating. We've done this 3 or 4 times and now we are thinking it's something else. Hopefully it's not a head gasket causign the misfire and the over heating or a crack in cylinder 4. There was no antifreeze in the oil, the oil was fine and for some reason it just keeps over heating. I don't know whether the cylinder 4 misfire could be connected with it overheating or what. Anybody know what to do? Hopefully I can get out tomorrow and check the radiator and stuff but I'm pretty darn sure it's working fine.

 

Does the exhaust smell like coolant?

 

Does the exhsust smell like coolant? Smoke on startup?

 

Now that you say that, I did have flowmaster super 40s put in, and ever since then it has smelled like coolant. I notice it but then I was just thinking, that couldn't be a problem. And the exhaust is very visible on startup and for some reason ever since I've been havin these problems, tons of water sprays out my exhaust now

 

Also looks like the radiator has some gunk on it, it could be mud because I could never get all the mud off when I went muddin.

 

I think you got an intake leak again.

 

Where at? The last time it had cracked and antifreeze was visibly leaking out of it in the front and we bought a brand new one. How could I see if it's leaking or not? And last time antifreeze was not being pushed out the resivior cap. And spewing everywhere...

 

It's a small leak into cyl 4 if you have a miss there and water coming out the exhaust.

 

Do you think that, that is why it is over heating? Could u explain a little more, I new to understand it better so I can give my dad information because he thinks it's a cracked head

 

Is there lots of foam in the coolant? When it runs?