|Spark plugs are on top of the engine block. Those 4 ignition leads "lead" striaght to them!|
You need a spark plug (tubular) wrench or else a spark plug socket - i.e. a deep socket of the correct size with a rubber insert to cushion the ceramic insulator and also grip it for withdrawl -(remember plug is screwed in to cylinder head which is not accesible from the top. (socket wrench and extension bar needed also of course).
The next spark plugs need to be tightened using a torque wrench to the correct torque (get a Haynes manual for the car to look this up). Be careful not to cross thread the plugs when screwing in. A short piece of say 6 mm flexible plastic tubing can be pushed on over the spark plug contact and used to start the plug in the hole.
Also spark plug gap should be checked with a feeler gauge and if necessary adjusted to the specified gap (this is actually given in the Nissan manual which comes with the car - also gives type of spark plugs to be used).
|its very eassy should be obvious but check where are the cables going to engine just remove the cable there is spark plug its eassy but u should have right tools for that.|