Misfire: Difference between revisions
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'''Items that can cause a misfire:''' | '''Items that can cause a misfire:''' | ||
===Loose/disconnected HT Leads=== | |||
Check they are all attached properly! (Cured my misfire anyway....) | |||
===Moisture in Distributor (Dizzy) Cap=== | |||
Unscrew, check for moisture, dry off. | |||
===Spark Plugs=== | ===Spark Plugs=== | ||
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[[Coil packs]] | [[Coil packs]] | ||
===Throttle Position | ===Throttle Position Sensor=== | ||
[[Throttle Position Sensor]] | [[Throttle Position Sensor]] | ||
Latest revision as of 18:10, 5 September 2011
Misfire
[edit | edit source]Steady Misfire
[edit | edit source]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:
Loose/disconnected HT Leads
[edit | edit source]Check they are all attached properly! (Cured my misfire anyway....)
Moisture in Distributor (Dizzy) Cap
[edit | edit source]Unscrew, check for moisture, dry off.
Spark Plugs
[edit | edit source]Coil Packs
[edit | edit source]Throttle Position Sensor
[edit | edit source]Lambda Sensor
[edit | edit source]Head Gasket Failure
[edit | edit source]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.
Inlet Manifold Gasket Failure
[edit | edit source]The Inlet manifold gasket can fail and allow air leaks and coolant/anti-freeze to leak into the cylinder ahead of the injectors. Tell tale signs can include rusty spark plugs on cylinder 1 and 4, sometimes even all four, lumpy idle or misfiring, high emissions, jerky acceleration and deceleration when coming off the accelerator, anti-freeze around the inlet manifold, unburnt fuel and possibly destroyed catalytic convertor.