Burning oil can cause spark plug fouling. Gas vapor flows through a small hole in the spark plug non-fouler to ignite and move the engine.

The purpose of the non-fouler is to act like a sleeve for the spark plug and keep out oil. However, all the options within the list are superb, and we would suggest using Proform 67407 Spark Plug Adapter as it could be a high-quality item and is available at an affordable. Regardless, could it be the contacts? If not and I don't want to open the engine up, could I use spark plug non-foulers at least on a temporary basis? They are sleeves of a sort that are supposed to shield the plugs from the combustion product build up while still allowing the plugs to fire. Keep the Spark Alive The best spark plug non-foulers for cars and trucks prevents the spark plugs from fouling. So to make things simpler for you, we have collected a catalog of top-rated 14mm Spark Plug Non Fouler you can choose from across their benefits and key features. Could the #1 and #4 contacts be dirty? I haven't looked because it's very difficult to get access to the distributor (screw down type) because of a lateral bulkhead and because I can't get the laminate top off of the galley because it's screwed down so well! He thought that might indicate that the valve guides in those cylinders are leaking by.Д«efore I buy/make a leak down tester, I want to ask if problems with the distributor may be the cause of incomplete combustion and fouled plugs rather than an oil leak.

I spoke with a mechanic who suggested doing a cylinder 'leak down' test which measures air leakage by pressurizing the cylinder and listening for the hissing air escaping through the rings, valves, exhaust or head gasket. The plugs are not wet, they foul because of a dry carbon build up.Д¬ompression is 90# and consistent for all cylinders so I don't think it's the rings or a stuck valve. I have a 'new last year' 1974 A4 and the #1 and #4 plugs foul after a short period of operation, 4-5 hours.

How to install spark plug non-fouler