Help ! Oil in spark plug slot

[dlgeary]

I need some help from the experts!

I am a new owner of a 94 ZR1 (6 Months) and last night when I was changing spark plugs, the #5 cyl spark plug was covered with oil on the outside. I pulled the boot and oil dripped out of it and when I pulled the plug it was tight and looked the same at the other ones but with oil on the outside. All other plugs were fine.

The car has been running fine. I suspected the crank case vent that enters the plennem just above this plug, and checked the PCV valves but they were fine. There are no visible signs of oil.

Where do I start looking?
Don

Don, has the engine been apart at all?

How high up the boot was the oil?

[dlgeary]

I do not know if the engine has been apart, it only has 24k miles but had several previous owners.

The oil was about half way up the boot.

I have not started it since changing the plug but no more oil leaked into the slot while I had it apart.

I'm thinking the oil is comming from the seal inbetween the cam cover and the cylinder head. This is not a place oil usually gravitates to if it is leaking from someplace else.

[dlgeary]

That's what I am afraid of too. Do you think that the first thing I need to do is take the plennum off to see what is going on in there. That is no small task in itself.

It's fairly simple to remove the plenum.
http://www.pnwzr1.net/LT5_tear_down.htm



I would suggest running the motor with out that psark plug plugged into the head and see if you have any seepage from the seal.