Blown head gasket?
 

Hello, I have a 89 Supra N/T. I got it from an auction. The guy said there was nothing wrong with it but there is. It misses really bad. When I pulled the plug wires off the valley where the plugs screw into the head was full of oil. I have never worked on one of there straight sixes before. What does this mean? I hear it could be a blown head gasket or a craked head. How mush is a rebuld kit for these? Thanks in advance.

Rebuild kit is much money. But its probably just the valve cover gaskets. Replace those and then go from there.

Ok I never thought about that. I ordered some and the grommets. Do I need anything else? Is there a diffrent process with these cars than others?

Other than taking the stuff off that is on top of the valve covers, you have to get the oil out of the sparkplug holes before you put new ones in. Otherwise a bunch of stuff goes into the cylinder when you pull the plug. A new set of plug wires and plugs and the valve cover gaskets are all you should really need.


Russ

I figured that but I havent figured out how I am going to do that yet. lol. What do you suggest?

the screws holding down the valve covers suck big time . look into replacing them when you do the job

How much is the stock horsepower on these things? How much are the bolts?

hp for a n/a is around 200 i believe. also you may want to retorque the head while you got the valve covers off. mk3 supras are notorious for blown head gaskets. retourqe to about 76 lb/sq in. also dont let the oil get low, these supras get mad when that happens.

I think I might have a worse problem. I pulled the dipstick and It had water in the oil. To me this means either blown head gasket or cracked head. I hear these supras are notorious for cracking heads. What do you guys think?

head gasket
 

Probably just a head gasket but you won't know till it comes off and gets checked. A good machine shop can check the head for warpage and cracks.
The biggest thing is that it wasn't you driving the car when this happened
so you don't know the situation when the damage occured and how long it was driven like that.
One of my previous engines lost the number 6 piston when the gasket blew
which meant used engine for me.