How To Change Spark Plugs
Spark Plug Replacement Car spark plug replacing procedure Helpful Information After replacing spark plugs the engine could stall , idle high or low , this is normal as the computer is re-learning the resistance of the ignition system which effects ignition timing . Some engine's are designed using spark plug wires which are easily removed (twist the boot to loosen seal) before removing wires. If the engine is running rich all of the spark plugs will have a black or grey soot covering the spark plug electrode and if lean all of the spark plugs will be clean and white. If one spark plug electrode appears different than the remaining spark plugs, that cylinder is having a problem. The inside of a spark plug socket is lined with a rubber cushion to safety support the spark plug insulator. Most engine's are designed with a COS system (coil over spark plug) which has no plug wires just ignition coils, other systems include HEI (high energy ignition) which utilizes a distrib...