Misfire - Revision history

Tommo7 at 18:10, 5 September 2011

2011-09-05T18:10:45Z

← Older revision		Revision as of 18:10, 5 September 2011
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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 ~~Sensore~~===		===Throttle Position Sensor===

	[[Throttle Position Sensor]]		[[Throttle Position Sensor]]

cddiment: /* Inlet Manifold Gasket Failure */

2008-07-31T21:48:07Z

Inlet Manifold Gasket Failure

← Older revision		Revision as of 21:48, 31 July 2008
Line 37:		Line 37:

	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.		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.

	The gasket sits inside a recess in the face of the inlet manifold where it joins to the engine. There are tabs on either end on the lower side to pull it out, it may be blackened from use. Early gaskets are black, an improved one was manufactured and is known as the green gasket (it's green) which can be sourced from between a pound to six pounds (2008).

	It can be changed without fully removing the inlet manifold by simply fully unscrewing the nuts on the manifold studs, you may find some studs will come out rather than the nut if rusted. The nuts under the inlet manifold are the hardest to access, especially on the later S1 Elise where the boot divider is a permanent fixture. Have ready both a short and long socket extension, preferably the type that allow angled movement on the socket, and long and short sockets. Removing the drivers side rear wheel arch liner will help greatly.

	[[Inlet manifold gasket failure]]		[[Inlet manifold gasket failure]]

cddiment: /* Inlet Manifold Gasket Failure */

2008-07-31T21:46:44Z

Inlet Manifold Gasket Failure

← Older revision		Revision as of 21:46, 31 July 2008
Line 42:		Line 42:
	It can be changed without fully removing the inlet manifold by simply fully unscrewing the nuts on the manifold studs, you may find some studs will come out rather than the nut if rusted. The nuts under the inlet manifold are the hardest to access, especially on the later S1 Elise where the boot divider is a permanent fixture. Have ready both a short and long socket extension, preferably the type that allow angled movement on the socket, and long and short sockets. Removing the drivers side rear wheel arch liner will help greatly.		It can be changed without fully removing the inlet manifold by simply fully unscrewing the nuts on the manifold studs, you may find some studs will come out rather than the nut if rusted. The nuts under the inlet manifold are the hardest to access, especially on the later S1 Elise where the boot divider is a permanent fixture. Have ready both a short and long socket extension, preferably the type that allow angled movement on the socket, and long and short sockets. Removing the drivers side rear wheel arch liner will help greatly.

	[[~~Head~~ gasket failure]]		[[Inlet manifold gasket failure]]

	[[Category:Engine]]		[[Category:Engine]]

cddiment: /* Inlet Manifold Gasket Failure */

2008-07-31T21:44:55Z

Inlet Manifold Gasket Failure

← Older revision		Revision as of 21:44, 31 July 2008
Line 36:		Line 36:
	===Inlet Manifold 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.		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.

	The gasket sits inside a recess in the face of the inlet manifold where it joins to the engine. There are tabs on either end on the lower side to pull it out, it may be blackened from use. Early gaskets are black, an improved one was manufactured and is known as the green gasket (it's green) which can be sourced from between a pound to six pounds (2008).		The gasket sits inside a recess in the face of the inlet manifold where it joins to the engine. There are tabs on either end on the lower side to pull it out, it may be blackened from use. Early gaskets are black, an improved one was manufactured and is known as the green gasket (it's green) which can be sourced from between a pound to six pounds (2008).

cddiment: /* Inlet Manifold Gasket Failure */

2008-07-31T21:43:57Z

Inlet Manifold Gasket Failure

← Older revision		Revision as of 21:43, 31 July 2008
Line 36:		Line 36:
	===Inlet Manifold 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 ~~tail~~ 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.		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.

	The gasket sits inside a recess in the face of the inlet manifold where it joins to the engine. There are tabs on either end on the lower side to pull it out, it may be blackened from use. Early gaskets are black, an improved one was manufactured and is known as the green gasket (it's green) which can be sourced from between a pound to six pounds (2008).		The gasket sits inside a recess in the face of the inlet manifold where it joins to the engine. There are tabs on either end on the lower side to pull it out, it may be blackened from use. Early gaskets are black, an improved one was manufactured and is known as the green gasket (it's green) which can be sourced from between a pound to six pounds (2008).

cddiment at 21:42, 31 July 2008

2008-07-31T21:42:59Z

← Older revision		Revision as of 21:42, 31 July 2008
Line 34:		Line 34:
	[[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 tail 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.

			The gasket sits inside a recess in the face of the inlet manifold where it joins to the engine. There are tabs on either end on the lower side to pull it out, it may be blackened from use. Early gaskets are black, an improved one was manufactured and is known as the green gasket (it's green) which can be sourced from between a pound to six pounds (2008).

			It can be changed without fully removing the inlet manifold by simply fully unscrewing the nuts on the manifold studs, you may find some studs will come out rather than the nut if rusted. The nuts under the inlet manifold are the hardest to access, especially on the later S1 Elise where the boot divider is a permanent fixture. Have ready both a short and long socket extension, preferably the type that allow angled movement on the socket, and long and short sockets. Removing the drivers side rear wheel arch liner will help greatly.

			[[Head gasket failure]]

	[[Category:Engine]]		[[Category:Engine]]

Mr Wiki at 23:03, 6 May 2007

2007-05-06T23:03:07Z

← Older revision		Revision as of 23:03, 6 May 2007
Line 6:		Line 6:
	In the case of a steady misfire, isolating the misfiring cylinder is the first step in diagnosing the problem.		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:'''


	~~'''Items that can cause a misfire:'''~~

	===Spark Plugs===		===Spark Plugs===
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	[[Coil packs]]		[[Coil packs]]

	===~~Idle Air Control Valve~~===		===Throttle Position Sensore===

	~~[[Idle Air Control Valve]] (IACV)~~

			[[Throttle Position Sensor]]

	===Lambda Sensor===		===Lambda Sensor===

	[[Lambda sensor]]		[[Lambda sensor]]


	===Head Gasket Failure===		===Head Gasket Failure===

Mr Wiki at 08:23, 6 May 2007

2007-05-06T08:23:59Z

← Older revision		Revision as of 08:23, 6 May 2007
Line 30:		Line 30:
	===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]]

Mr Wiki at 08:23, 6 May 2007

2007-05-06T08:23:32Z

← Older revision		Revision as of 08:23, 6 May 2007
Line 4:		Line 4:
	===Steady Misfire===		===Steady Misfire===

	In the case of a steady misfire, isolating the misfiring cylinder is the first step in diagnosing the problem. The old-fashioned method for finding a weak cylinder is to temporarily disconnect each of the spark plug wires, one at a time, while the engine is idling. When there's no change in the idle speed, then you have pinpointed the weak cylinder.		In the case of a steady misfire, isolating the misfiring cylinder is the first step in diagnosing the problem.

	A power balance test will tell you the same thing, but it requires some hookups and an engine analyzer. A power balance test is preferable to pulling plug wires, because it keeps you away from the voltage and prevents the voltage from causing any damage to the electronics in the ignition system.

Mr Wiki at 08:21, 6 May 2007

2007-05-06T08:21:46Z

← Older revision		Revision as of 08:21, 6 May 2007
Line 2:		Line 2:


			===Steady Misfire===

	~~Many Items can cause~~ a misfire:		In the case of a steady misfire, isolating the misfiring cylinder is the first step in diagnosing the problem. The old-fashioned method for finding a weak cylinder is to temporarily disconnect each of the spark plug wires, one at a time, while the engine is idling. When there's no change in the idle speed, then you have pinpointed the weak cylinder.

			A power balance test will tell you the same thing, but it requires some hookups and an engine analyzer. A power balance test is preferable to pulling plug wires, because it keeps you away from the voltage and prevents the voltage from causing any damage to the electronics in the ignition system.



			'''Items that can cause a misfire:'''

			===Spark Plugs===

	[[Spark plugs]]		[[Spark plugs]]

			===Coil Packs===

	[[Coil packs]]		[[Coil packs]]

			===Idle Air Control Valve===

	[[Idle Air Control Valve]] (IACV)		[[Idle Air Control Valve]] (IACV)


			===Lambda Sensor===

	[[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]]		[[Head gasket failure]]