Spark Plug: Service and Repair
Removal/Installation1. Remove and install the high-tension leads.
Removal NOTE
High-tension lead
When removing leads from the coil packs, squeeze the locking tabs of the coil wire retainer and remove using a twisting and pulling motion. Do not pull on the lead.
CAUTION
^ When the spark lead is to be pulled off, be sure to pull on the boot itself, not the lead.
2. Remove and install the spark plug with a plug socket.
Install Spark Plug Socket Squarely Over Spark Plugs:
CAUTION
^ Be sure the socket fits squarely over the spark plug.
NOTE
^ If the original spark plugs are to be reinstalled, they must be installed in the locations from which they were removed.
3. Apply anti-seize compound or molybdenum-based lubricant to the spark plug threads.
4. Tighten the spark plug to the specified torque.
Tightening torque:
2.3L/3.0L: 9 - 20 N.m {1.0 - 1.9 kgf.m, 7 - 14 ft.lbf}
4.0L: 14 - 20 N.m {1.4 - 1.9 kgf.m, 10 - 14 ft.lbf}
NOTE
^ Coat the entire interior surface of the high-tension lead boot with a silicone dielectric compound or equivalent.
2.3L
NOTE
^ 1996 B-Truck uses double platinum enhanced spark plugs for production. Both the ground (side) and center electrode are enhanced with platinum.
^ You can also use spark plugs with the service part number suffix letter "PP" as replacement spark plugs.
4.0L
NOTE
^ Factory installed spark plugs are painted for left and right bank. These plugs are not interchangeable. Spark plugs for Left bank: White marked Spark plugs for Right bank: Dark Green marked
^ Service part can install at any place.
Spark test
1. Remove the spark plug.
2. Connect the spark plug to a high-tension lead.
3. Hold the high-tension lead and spark plug with insulated pliers 5 - 10 mm {0.20 - 0.39 in} from a ground.
4. Crank the engine and verify that there is a strong blue spark.
5. If there is no spark Testing and Inspection