i've done two mpfi swaps and both times water mixed with the oil.. anyone else have this problem with their mpfi swap???

at first i thought it was just my motor was bad with a bad head gasket.. could it be a coincidence that the second time i done it for a friend that he had a bad head gasket also??

it wasnt a slow mix at all.. at first crank it will start and there is no cel at all.. it all seems fine and revs fine and then all this white smoke out the rear and i check the dip stick and theres water.. water even comes out of the exhaust headers like a mad flood..

im pretty sure i've done the swap correctly with the wiring and hoses .. i would really appreciate your opinions..

could it be just that i have bad luck and the two motors ive done the mpfi swap to were bad to begin with??

thanx
tony

 

Disclaimer: I am very sleepy...that being said....

When you do the MPFI swap and you change the intake manifold, do you remember to change the Intake Manifold gasket? For that matter, is it even being applied? What I think is happening is that there is a leak in the gasket allowing coolant that is ment for the Intake to enter the runners and flood the combustion chambers. When it is being compressed, the coolant is either a) escaping through the valve assembly into the head and draining back into the oil passages, or b) giving the piston rings one massive case of blow-by. That is just my theory though. What do you think?

 

when i did the swap i got a new intake gasket for the 88-91 si intake manifold..
im pretty sure its not that .. but that was my first guess too.. that the coolant somehow was going straight into the intake manifold chamber..

 

Unless it is (statistical improbability) that both motors have blown head gaskets, give the manifold gasket a check. I have a whole head w/ intake sitting here on my floor and in my state of quasi slumber that is the only repeatable way that I could see coolant entering as you described from two motors. Also, could the manifolds not be torqued down to the proper spec?