Fifth Avenue V6-231 3.8L VIN L FI (1992)
Scavenger Deposits
Symptoms: Red, Brown, White or Yellow deposits.
Possible Causes:
^ Normal condition caused by certain fuel additives, which are designed to change the nature of deposits and decrease spark plug misfire
tendencies.
Note:
Notice that accumulation on the ground electrode and shell area may be heavy but the deposits are easily removed. Spark plugs with scavenger
deposits can be considered normal in condition and be cleaned using standard procedures.
Shiny Yellow Glaze
DESCRIPTION:
Shiny yellow glaze coating on the insulator.
POSSIBLE CAUSE
ACTION
................................................................................................................................................................................................................................................
Metal By-products Of Combustion
- Avoid sudden acceleration with wide open throttle after long periods of low speed driving.
..................................................................................................................................................................................................................................................
Spark Plug Inspection
^
Remove the spark plugs and examine them for burned electrodes. Also check for fouled, cracked or broken porcelain insulators. Keep plugs
arranged in the order in which they were removed from the engine. An isolated plug displaying an abnormal condition indicates that a problem
exists in the corresponding cylinder. Replace spark plugs at the intervals recommended in the Maintenance Schedules.
^
Spark plugs that have low mileage may be cleaned and reused if not otherwise defective -- SEE Spark Plug Condition. After cleaning, file the
center electrode flat with a small point file or jewelers file. Adjust the gap between the electrodes to the specified dimension. The spark plug gap is
0.89 mm (0.035 in).
^
Always tighten spark plugs to the specified torque. Over tightening can cause distortion resulting in a change in the spark plug gap.
Spark Plug Resistance Test
Resistance should be at least 6,000 to 20,000 ohms when checked with at least a 1000 volt tester.
Wet Oily Deposits
FUEL FOULING
A spark plug that is coated with excessive wet fuel is called fuel fouled. This condition is normally observed during hard start periods. Clean fuel
fouled spark plugs with compressed air and reinstall them in the engine.
White or Gray - Burned or Blistered Insulator
SPARK PLUG OVERHEATING
