Where can I find a diagram of the cylinder numbering on an '03 EX 4 Cylinder? I need to find number three to replace the plug and coil.

 

Is this a 4 or 6 cylinder EX?

 

I see it is a 4 cylinder.

 

In regards to the sparkplugs, Iridium plugs come pre-gapped. Torque them to 18 N.m (1.8 kgf.m, 13 ft lbs.)

 

Great! Thank-you!

 

So, the spark plug tube #3 had some oil in it, was on the bottom of the spark plug coil and the top of the plug. No other tubes contained oil. I have mopped up the oil from the tube and I am ready to take out the plug to inspect. If there is no oil on the electrode beneath, Have I got a reasonable chance that it is just the valve cover gasket leaking?

 

The spark plug tube seals probably need to be replaced.

 

The VC kit will come with the tube seals. Change them and you will be fine

 

Only the kit comes with all the gasket/seals. Honda and aftermarket does sell the valve cover gasket by itself. For example, at the dealerships, many times they would only replace the valve cover gasket as part of a valve adjustment, and not the spark plug tube seals.

 

Post number 7 above has a picture labeled A showing the direction you install the tube seal. Pay attention to the direction the original seals are installed, because you intuitively want to install the seal upside-down. I recommend removing one seal at a time, so you have something to compare to ensure you install the seal facing the correct direction.

I would also use a light coating of oil or grease on the spark plug tube seals when you reinstall the valve cover. This will help the seals slip over the spark plug tubes and not tear the new seals.