I recently had the O rings and upper manifold? gaskets replaced on my Jaguar X Type 2002 2.5 litre. I did not realize that there are six more lower gaskets. The mechanic did not even bother to check them.

I also put in new premium plugs, another mechanic pulled them to check them and I noticed they were kind of greasy and oily, that does not seem normal.

He also unhooked the PCV ribbed hose and I noticed some oil dripping out. That does not sound right either.

My question to anyone on the forum is, if the lower six gaskets that were not replaced had a problem, would that cause a vacuum leak?

I have the dreaded cruise not available light on all the time.

Lastly would a problem with the the lower six gaskets cause the plugs to be oily, and oil to come from the PCV hose?

Would oil on the plugs foul them?

Lot of questions I know but any advice appreciated.
Chris

 

Panama, the lower gasket would cause a potential vacuum leak issue. So, it is possible that those are the source of your problem. As for those same gaskets causing oil to appear in the plug wells (holes), they have nothing to do with that. Odds are, your o-rings that provide the barrier between the valve cover and the plug wells are where your problem lies there. You would need to replace the valve cover seals to fix that.

As for oil in the PCV hose, this is not uncommon. Granted, this normally means that you either have a leak into the crankcase or the PCV valve is old and sticking, allowing too much blowby.

If you have oil in the plug wells, it can cause the motor to run rough as the oil is more conductive than air. This will cause the plugs to "spark" from the outside of the plug to the plug well vice from the plug tip to the ground bar (inside the cylinder). No spark in the cylinder leads to the motor running like hell.

 

Very useful info Thanks
Chris