tuff5liter

ok this has been an ONGOING problem for me for about 5 months and its driving me ABSOLUTLEY CRAZY, i have thought about taking my car to a shop to get them to fix it but all the shops i go to are clueless........need help PLEASE!!!

I have coolant leaking into my oil. and the wierd part is i pulled my upper intake today to change my injectors and the first three intake ports and the last one (from front to back) had a coolant and oil mixture stain on them.....how the hell can coolant and oil get into my intake ports? I thought at first it was the cobra intake i purchased but now i have the track heat and it is doing the same thing. It doesnt seem to be affecting driveability but it is FORSURE a concern of mine. Whenever I check my oil it has a greenish tint to it and it is way thinner. best example i can give is you know how whenever you look at oil draining and the light shines through it and it has an amber tint? Well this has a green tint. I have to run 20w50 in my car just so it will be like 5w30 later on down the road. Changing my oil every month or 600 miles is getting real old.

How the **** is coolant getting into my oil....and how the hell is that mixture getting into my intake manifold???

things i have tried to solve it by

1...changing head gaskets....
2...changing lower intake gaskets....
3...changing my timing cover gasket....


PLEASE HELP.....

ooticamitica

coolant flows throught the throttle body, does it have a crack? is that possible?? dont know id check the hose fittings maybe it leaked over the top of the tb and into the intake?

tuff5liter

the passages that go through the egr spacer are blocked off, and there is a plug in the heater core line and the back of the intake manifold...

Dearborn5.0

EGR spacer was my first thought, once you say you replaced the head gasket.....

but you took care of that.

My thought is there is a crack in your lower intake, and vacumn is pulling coolant into the ports. It could be a hairline.

But this does not help you.

Hopefully it would be a seal, but you eliminated that....

primetime5.0

maybe something with that hardline that has coolant running through it? I really have no clue

gspfunk

I have a similar problem, but I think I'll be able to fix mine tomorrow when I replace the lower intake to head gaskets. It can't be from your EGR spacer if you don't have coolant flowing thru it, so my guess would be that it's a cracked head, a bad seal on the gaskets between the lower intake and intake side of the head, or a cracked lower intake.....

vristang

Have your heads ever been decked?

If you shave down the heads far enough, it can cause sealing issues between the lower intake and head.

Also, are you positive the lower intake/head gasket is not slipping when you drop the intake into place (during assembly)?
I have had mine slip and ended up having a vac leak common to the lifter valley.
You can imagine how difficult that was to diagnose.

My only suggestion for finding the leak would be to pressurize the cooling system for a long duration of time. Sooner or later you will find the leak.

Nadelle

as soon as you said coolent in your oil....i thought blown head gasket.

marx91

do a compression test, just to rule out a blown head gasket,
did you use gasket maker on the front and rear of the lower intake when you did the swap?

5.0stanger

I have never heard of coolant and oil mixing and looking like green oil...Coolant and oil mixed turns milky white. Also, it will make your oil thicker.
As far as the oil in the intake runners, I would guess a combo of worn valve guides and seals or bad intake gaskets.