B4000 SE Regular Cab 4WD V6-4.0L OHV (1999)
Spark Plug: Service and Repair
NOTE: Refer to the chart in Step 4 to determine the condition of the spark plugs.
1. Remove the spark plug wire from the spark plug.
2. Loosen the spark plug.
CAUTION: If reversing existing spark plugs, mark their location before removal.
WARNING: Always wear eye protection when using compressed air.
NOTE: Use compressed air to remove any debris from the spark plug well before removing the spark plugs.
3. Remove the spark plug.
4. Inspect the spark plugs.
5. Check and adjust the spark plug gap as necessary.
NOTE: Platinum-enhanced spark plugs should not require adjustment throughout their service life.