Tracker 4x2 L4-1.6L VIN 6 (1995)
Spark Plug: Testing and Inspection
Spark Plug Diagnosis
SPARK PLUG FAILURE MODES
Worn or Dirty Spark Plugs
Worn or dirty spark plugs provide satisfactory performance at idle speed, but under more demanding operating conditions, they will frequently
misfire. Conditions such as poor fuel economy, power loss, loss of speed, hard starting and generally poor engine performance may he the result of
misfiring spark plugs. Spark plugs may misfire due to carbon fouling, an excessive air gap, a broken insulator, bridged electrodes or a damaged spark
plug wire and/or boot.
Fouled Spark Plug
Fouled spark plugs are indicated by black carbon deposits on electrodes. These black deposits are usually the result of slow-speed driving and short