TomoHawk Posted September 26, 2003 Share Posted September 26, 2003 I recently checked the plugs on my 78 280Z. Couple had oil on the spark plug threads, other one seemed to have some black gunk on the plug tip. Does that mean anything? Thx. Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted September 26, 2003 Share Posted September 26, 2003 Good question. My plugs always seem to have a bit of oil on the threads as well. The engine I'm running is practically new, with compression differing less than 1 psi across all 6 cylinders. Quote Link to comment Share on other sites More sharing options...
TomoHawk Posted September 26, 2003 Author Share Posted September 26, 2003 Did some research since posting and here are a few interesting links: General info: http://www.everything2.com/index.pl?node=spark%20plug More info: http://www.241computers.com/ford/ContentExpress20-80-81.html (check the left pane for links on reading plugs, etc.) This kind of stuff ought to be compiled for the newbies... Quote Link to comment Share on other sites More sharing options...
TomoHawk Posted September 26, 2003 Author Share Posted September 26, 2003 I read some of those links I posted ( always heed your own advice) and one mentioned proper tuqueing the plugs. As I remember, the plugs seemed to brake loose easily. Could that mean they could have been loose and the oil was seeping out from cylinder compression? Hopefully so. Otherwise, it would mean worn cylinder walls/rings. Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted September 26, 2003 Share Posted September 26, 2003 I doubt my cylinders are worn, and I don't seem to go through much oil. I also always torque my plugs on re-install. The oil on the threads just seems to be the way things are. The plug tips are always fine; there is certainly not enough oil to foul them. Quote Link to comment Share on other sites More sharing options...
TomoHawk Posted September 26, 2003 Author Share Posted September 26, 2003 Same with me. I tighten the plugs right, doesn't seem to be burning any oil and the other plugs are the right color. I think I will just assume the (old) plugs may have had looser threads and some oil seeped through. Getting new plugs anyways. Wires, coil (which one?) and whatever other (consumables) it might need for this new owner. Quote Link to comment Share on other sites More sharing options...
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