Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Hi There, I'm Clayso a certified master automobile technician with 30 years of automotive repair and diagnostic experience.
You will need to have the vehicle checked for codes to find out why the (CEL) Check Engine Light is on. On OBD2 systems the CEL will illuminate to warn the driver of any malfunction causing emission deterioration. Most parts stores will check codes for you at no cost, (except CA). The spark plugs I can help you out with right now. They are located under the coil packs. This system uses coil on plug, meaning there is a coil for each plug. The complete service procedure for the spark plugs is in the link below.
Spark Plug Service and Repair
The specifications are as follows:
Gap (Nominal): .................. 1.1 mm (0.043 inch)Spark plug Torque: ............. 19.6 - 29.4 Nm (2.0 - 2.9 kg-m, 15 - 22 ft. lbs.)
Have the vehicles codes checked and let me know the specific P codes and I'll see what all I can find.
I hope this information is helpful. If you have any questions or comments let me know.
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The coils are bolted down in the center of the valve cover. There is one bolt on each and a 3 wire connector on each. The book calls for 2½ hours to change the plugs, so it's not a leisure walk in the park. The procedure I sent over is specific to an '02 Pathfinder with the 3.5. Let me know the VIN and I'll verify my information.
The CEL illuminates when anything affects emissions. Misfires do affect the vehicles emissions as do any drive ability problems.