Misfire: Difference between revisions
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'''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=== | ||
| Line 18: | Line 25: | ||
[[Coil packs]] | [[Coil packs]] | ||
=== | ===Throttle Position Sensor=== | ||
[[Throttle Position Sensor]] | |||
===Lambda Sensor=== | ===Lambda Sensor=== | ||
[[Lambda sensor]] | [[Lambda sensor]] | ||
===Head Gasket Failure=== | ===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. | 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]] | [[Head gasket failure]] | ||
===Inlet Manifold Gasket Failure=== | |||
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. | |||
[[Inlet manifold gasket failure]] | |||
[[Category:Engine]] | [[Category:Engine]] | ||
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.