I own a 95 Honda Accord. About 2 months ago, as I was driving, my car suddenly started rumbling. I pulled over and noticed that one of the spark plug connectors was loose (about 0.7 cm higher than the others), so I pushed it back in, and the car ran fine again. All was well until yesterday, when the rumbling started again. Same problem, same fix. Today, after driving for about 10 minutes, it happened again. I yanked the whole spark plug thing out, and noticed that it was coated with oil. The other spark plugs have some oil on them too, but not as much, and they don't get loose. Any ideas what's wrong and how to fix it? Thanks.

 

Sounds like you need to replace the spark plug tube seals and you might as well replace the valve cover gasket while you're at it. here's a DIY: http://filtsai.com/accord/valve_cover_gasket/index.php

 

Those seals would explain the oil, but maybe not explain the plugs popping up.

Check your spark plugs haven't worked loose over time (leaking compression which pushes the plugs up). Or maybe just replace the spark plugs if they'renearlydue?

 

Let's hope they're the upper seals and not the lower...

I don't know if you could stick a needle nose pliers in the plug and pinch the... thingers... closer together. Worth a shot.