Follow the plug wires from the distributor.
The distributor cap is located where the spark plugs cables are connected .They go from the motor to the distributor cap.
There are seals under the valve cover that need replaced to repair oil on the spark plugs.
Lift the hood, disconnect the battery, remove the spark plug cables and covers, and remove the old spark plugs. Next put in the new spark plugs, replace the cables and covers, reconnect the battery and close the hood.
Unfortunately, this is not easy. You have to basically take everything off of the top of the engine, all the way down to the fuel rail, to be able to access the rear spark plugs.
You reach over the top, or Jack the van up and reach them from underneath.
Check to make sure the wires are all tight and you have them in the correct firing sequence. Also make sure you put the correct plugs in.
Does it have fuel/spark/compression?
Screwed in the head.
If a plug is just stuck in the hole, it can be removed with the correct tool. You should use a spark plug wrench to remove it. Sometimes it just takes a little extra elbow grease.
two spark plugs are located to the right side of the engine and the other two spark plugs are located on the left side of the engine.
A person can replace the rear spark plugs very easily. Disconnect the battery, remove the cables/boots and the old spark plugs. Put in the new spark plugs, reconnect the cables and boots, and reconnect the battery.
On top of the motor you will see the plug wires going down the middle of the valve cover. The plugs are under those wires.