Oil in number 4 cylinder but great compression number

[97GsXfreak]

Alright I have a 6 bolt motor with around 3000 miles on it and I did a compression test that came out around 170 in each cylinder but when I remove my number 4 cylinder plug it is soaked with oil. All the other plugs are fine but I cant seem to figure out what the problem is.

 

[gixrman]

Did you do a leak down test? oil in the cylinder will will give you a false comp. reading by sealing the piston rings.

 

[No_Skillz]

Clarify if there is oil on the tip of the plug or just on the outside. If on the outside, it could be simply a valve cover gasket job. If there is oil on the inside, you could have a whole bunch of problems including that cylinder not detonating.

 

[97GsXfreak]

I didnt do a leak down test yet but before i did the compression test i cleaned off the plug and fired up the car....the car smoked and burned off all the oil in the cylinder I checked the cyclinder and there was no oil when i did the compression test. The oil only comes back after a few hard pulls. When i do a pull it at like 5 grand the car stops pulling hard and it sounds like quick bursts of blah over and over. I dont know how to explain it well. I dont know if that has anything to do with the oil getting on the plug or if its just a tuning thing.

 

[97GsXfreak]

Alright I think the problem is that my oil cap is leaking and all the oil that is leaking out is sitting next to the number 4 cylinder and leaking down in where the spark plug goes. I have noticed oil on the plug only twice and those were times I drove home from college 3hrs and there was tons of oil on the valve cover. This would explain why I dont have a misfire in that cylinder. And this could also explain that when I took out the plug the oil fell down in the hole..and why I have good compression numbers? I just beat the shit out of the car and a little oil had leaked out of the cap but I pulled the plug and no oil down there.

 

[gixrman]

that could be it, I had the same problem but the oil was actually grounding out the plug boot and causing a misfire. I smoked 2 good sets of plug wires.

 

[BrokenTsi]

with a decent pair of plug wires that shouldnt be too possible. They should create a nice seal when pressed down tightly. Youd have to be losing alot of oil to pool in the valve cover, then drain into a cylinder like that id assume as there is a lip around the hole on the cover to prevent just that.