In this page we will illustrate how to replace the spark plugs, spark plug wires and distributor cap and rotor in a 1999 Nissan sentra with a 1.6 L DOHC engine, the same steps apply to all Nissan Sentras equipped with a 1.6 L DOHC engine from 1995-1999, these steps also apply to all Sentras equipped with a 2.0 L DOHC engines from 1991-1999.
A complete tune-up also includes the replacement of the air filter, fuel filter, pcv valve, check all fluid levels, oil change etc, ( all of these steps are described in our previous page Tune-up ). We will show you how to perform the remaining steps in this particular model in future pages.
The first step is the replacement of the number one spark plug, pull gently on the spark plug wire and set it aside.
-Next, using a 5/8 spark plug socket, a long extension and a 3/8 ratchet, loosen the spark plug, once you break it loose, you should be able to turn the extension with your hand.
IMPORTANT: Before the spark plug removal, make sure that the cavity is free of dirt or any other contaminants, otherwise these particles will fall inside the cylinder as you remove the spark plug, creating a potential engine damage!. If dirt is trapped in between the valves and the valve seats, there is a chance that the valve (s) may lose their tight seal causing the cylinder involved to lose compression , turning a simple tune-up in to a major engine repair!.
- To avoid this potential problem, blow each spark plug cavity with compressed air prior to spark plug removal.
- f the spark plug socket doesn't have the rubber insert inside, use a tool like the one in the picture to extract the spark plug from its cavity, if you don't have access to this tool, use a small piece of hose that fits tight over the spark plug, it will work as well as the tool in this picture.
- If you are using non-platinum spark plugs, you can use a standard spark plug gauge like the one in the picture to set the correct spark plug gap listed under specifications in the hood of the car, if you are using platinum spark plugs, read the box carefully, some platinum spark plugs discourage the use of gap adjusters to avoid damage to the spark plug.