In 1993, Nissan jumped into the minivan game with its Nissan Quest, and the model received a light revision in 1996. The 1997 Quest featured a 3.0-liter V-6 with 151 horsepower, and Nisan recommended changing its spark plugs every 30,000 miles. Before installing new spark plugs, you should always check the gap between the electrodes on the end of each plug, regardless of whether the plugs claim to come pre-gapped or not.
Place a 0.031-inch feeler gauge between the electrodes on the end of the spark plug, then slide the feeler gauge out from between the electrodes. If the spark plug is correctly gapped, you will feel light resistance as you pull the feeler gauge out. If the feeler gauge comes out with no resistance, use a spark plug gap tool to close the gap between the two electrodes until there is light resistance. If the feeler gauge is difficult to insert between the two electrodes, or hard to pull out from between the electrodes, widen the gap slightly with a gap tool.
Tighten the plugs to 14 to 22 foot-pounds.
