Did a compression check and....

[tysongross]

all cylinders were 150-170 except for number 6 which was 45... put a little oil in the cylinder and went to 180 then 170..150...130..etc checked it a couple times just to be sure.

Guess I will have to pull the motor to find out more.

 

[Scott87]

Was the car cold when you did the test?

 

[azbob]

If oil raised the compression drastically..your ring seal is gone.

 

[tysongross]

reply

Car was cold when I did the test. only symptoms are that it slowly overheats and smoke out the valve cover breathers.

 

[tysongross]

What would cause this to happen? the engine was rebuilt 10000 miles ago. Never over boosted to my knowledge.

 

[Nick Micale]

If it was mine, I would pull the head in the car since it must be removed anyway.

Sounds like a piston/ring problem, but I would not rule out the possibility of a head gasket?

 

[pdzz]

If it was mine, I would pull the head in the car since it must be removed anyway.

Sounds like a piston/ring problem, but I would not rule out the possibility of a head gasket?

X2, my thoughts exactly. Phil.

 

[daves87gn]

I would do a leak down next

and listen to where the air comes from

I also think its rings, but you never know, when was the last time you re-torqued your heads?

 

[pacecarta]

overheating smokes breathers and #6 low as he found the gasket is mostlike pushed into the coolant passage , fire ring is still intact but the gasket is damaged


pull the head , youll be doing it anyway even if it is the valves
, if gasket is fine (which i highly doubt) or if valves are fine (now youll know because ou can check them or take them to a shop that can ) and if it is the rings now with head off you can drop pan and pop the piston out and take a good look , replace rings if need be or determine if the cylinder has excessive wear warranting a rebuild
if it turns out the #6 cylinder is worn and the others arent then besides just a rebuild its also time to check the injectors or replace them

my money is on the gasket