ok heres the story got a 99 f150 with 5.4 3 days later engine went so new engine but had 2 swap intake...now the truck runs good but today i put er down 2 the board a bit playin in the snow. when i stopped there was antifreeze comin out my exhaust.....as in green liquid drippin on the snow and a decent amount,,,,so im curious anybody see this even drove home after this and thats an hour on the highway..no prob runs fine normal temp and all..no coolant leaking at all.....my question is it just at full throttle the vac is pullin coolant from intake????they used the ol gaskets for intake swap....what yall think????no oil in coolant or coolant in oil....curious bout opinions ill pressure test it 2morrow and go from there....

 

they used the old gaskets!!!!???!!!!! thats your problem

 

x2

 

X3

 

Some guys think those newer type rubber band gaskets can be used over. Some can, in certain applications. I would NEVER re-use one on an area as critical as an intake. Take a look at one when it is new... it's not flat as a pancake like they look when you pull something apart. Also.. did they follow the torque pattern when they tightened it? Too bad a short cut like that equals a do-over. Good Luck in getting it fixed.

Jeff

 

Yeah on something like a oil pan or trans pan, but intake gasket falls into the same category as reusing a head gasket

 

who did this? a shop or a friend?.......you prob will overheat on a 1 hr drive b/c youll be losing coolant and pressure

 

ive been babyin er and no loss of coolant..no heatin up at all but im doin the gaskets anyway i think just under the vac draw of hard acceleration its pullin it out of the water jackets.n i agree ...i was pissed when i found out they reused the intake gaskets...this is my work that did the job....i am a bodyman and the painter but our mechanical end is a joke mechanic comes to me for advice all the time...long story ive just never seen it where the antifreeze is comin out exhaust was curious if any1 seen this....im sure its the intake...ive done mechanical for years and should of just did this myself as i am from now on like i used to...

 

Will they let you paint there cars?

 

lol always do maybe its time i start forgetting to prep them right so paint flys off at the car wash ha ha....

 

ive never had one of these intakes off, but i took off my throttle body yesterday and i was lookin and is there even water jackets that run thru the intake like older engines?

 

Yup.Still has to cross over to circulate

 

I think it goes between the #1 and #5 cylinder. If it's leaking into one of those, you're risking a blown head gasket and an expensive fix. That's what happened to mine when the intake manifold gasket failed.

Mike

 

I know on my Mustang with the 4.6 it crosses over at the front between #1 and #5 ( as mentioned by Mike). My intake basically blew where the plastic crossover on the front of the intake cracked. I lost all my coolent in about 1 minute. That's not related to this problem being discussed, but I do know the intake carries coolent from one side to the other. Any breach in the gasket would allow coolent to get into the intake. What I don't understand here is why it is not burning it and showing up at the tail pipe as white smoke? If it was a massive internal leak MAYBE it would drip out the pipe, but that's a LONG way to go with out being burned up by something. Plus he claims his coolent level doesn't go down much? Doesn't make sense to me. If it's pulling from the water jackets that is head gasket related, not intake related. If it started right after the intake was installed, I can't understand how it could not be front crossover related. Either way I would not ignore this, you can do some serious damage with large amounts of coolent getting into the combustion chamber. Good Luck...and keep us informed.

 

I have the cast crossover on my 2000 5.4, but the stock gasket failed on leaked coolant into cyl #1 and engine = boom!

With that much coolant coming out of the pipe, I don't see how it could run right or hydrolock for that matter. I wonder if flooring it after the overhaul might have just caused some crud to get flung out of the exhaust that was just sitting there under normal pressure and it just happened to look green like antifreeze?

Mike