Misfire

Steady Misfire

In the case of a steady misfire, isolating the misfiring cylinder is the first step in diagnosing the problem.

Items that can cause a misfire:

Spark Plugs

Spark plugs

Coil Packs

Coil packs

Idle Air Control Valve

Idle Air Control Valve (IACV)

Lambda Sensor

Lambda sensor

Head Gasket Failure

A spark plug that shows heavy whitish to brown deposits may indicate a coolant leak either past the head gasket or through a crack in the combustion chamber. This type of problem will only get worse and may soon lead to even greater problems if the leak isn't fixed. Coolant makes a lousy lubricant and can cause ring, cylinder and bearing damage if it gets into a cylinder or the crankcase.

Head gasket failure