Passing your MoT Emissions Test - Revision history

Scottish Scrutineer: Add comment about fuel quality

2017-03-29T07:05:01Z

Add comment about fuel quality

← Older revision		Revision as of 07:05, 29 March 2017
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	Generally if any [[ECU]] sensor is faulty (particularly the water temperature sensor) the [[ECU]] will run the engine rich as a self preservation measure.		Generally if any [[ECU]] sensor is faulty (particularly the water temperature sensor) the [[ECU]] will run the engine rich as a self preservation measure.

			Ensure the fuel is fresh. Modern unleaded fuels deteriorate over time, losing volatile constituents. This can be a problem if the car is taken out of winter hibernation straight for MOT. Best to fill with fresh petrol and go for a good run to flush and get everything up to temperature before emissions testing.

Arisutea: /* Problems */

2010-04-06T09:55:18Z

Problems

← Older revision		Revision as of 09:55, 6 April 2010
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	Some of the higher performance elises (S160, S190 etc) run a bit close to the wind on emissions, taking the car for a good thrash (10 or 20 miles) to get the CAT fully up to temperature and to burn off some of the carbon hich may have built up in the engine can help.		Some of the higher performance elises (S160, S190 etc) run a bit close to the wind on emissions, taking the car for a good thrash (10 or 20 miles) to get the CAT fully up to temperature and to burn off some of the carbon hich may have built up in the engine can help.

	A leaking ~~exhauset~~ flexi joint can allow some air back up the exhaust and fool the lamda sensor making the ECU run the engine rich which can in turn cause an emissions failure.		A leaking exhaust flexi joint can allow some air back up the exhaust and fool the lamda sensor making the ECU run the engine rich which can in turn cause an emissions failure.

	Generally if any [[ECU]] sensor is faulty (particularly the water temperature sensor) the [[ECU]] will run the engine rich as a self preservation measure.		Generally if any [[ECU]] sensor is faulty (particularly the water temperature sensor) the [[ECU]] will run the engine rich as a self preservation measure.

Mr Wiki at 21:14, 17 January 2007

2007-01-17T21:14:06Z

← Older revision		Revision as of 21:14, 17 January 2007
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	A leaking exhauset flexi joint can allow some air back up the exhaust and fool the lamda sensor making the ECU run the engine rich which can in turn cause an emissions failure.		A leaking exhauset flexi joint can allow some air back up the exhaust and fool the lamda sensor making the ECU run the engine rich which can in turn cause an emissions failure.

	Generally if any ECU sensor is faulty (particularly the water temperature sensor) the ECU will run the engine rich as a self preservation measure.		Generally if any [[ECU]] sensor is faulty (particularly the water temperature sensor) the [[ECU]] will run the engine rich as a self preservation measure.

Steve69 at 17:41, 25 November 2006

2006-11-25T17:41:38Z

← Older revision		Revision as of 17:41, 25 November 2006
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	[[Category:Exhaust]]		[[Category:Exhaust]]

			==Problems==

			Some of the higher performance elises (S160, S190 etc) run a bit close to the wind on emissions, taking the car for a good thrash (10 or 20 miles) to get the CAT fully up to temperature and to burn off some of the carbon hich may have built up in the engine can help.

			A leaking exhauset flexi joint can allow some air back up the exhaust and fool the lamda sensor making the ECU run the engine rich which can in turn cause an emissions failure.

			Generally if any ECU sensor is faulty (particularly the water temperature sensor) the ECU will run the engine rich as a self preservation measure.

217.160.76.165 at 09:28, 30 August 2006

2006-08-30T09:28:52Z

← Older revision		Revision as of 09:28, 30 August 2006
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	==The Lambda Sensor==		==The Lambda Sensor==

	Otherwise known as an [[Lambda ~~Sensor~~\|Oxygen Sensor]] or a HEGO sensor (Heated Exhaust Gas Oxygen), the [[Lambda sensor]] returns a voltage signal which is a non-linear function of the amount of oxygen present in the exhaust		Otherwise known as an [[Lambda sensor\|Oxygen Sensor]] or a HEGO sensor (Heated Exhaust Gas Oxygen), the [[Lambda sensor]] returns a voltage signal which is a non-linear function of the amount of oxygen present in the exhaust

	[[Category:Exhaust]]		[[Category:Exhaust]]

217.160.76.165: /* The Lambda Sensor */

2006-08-30T09:28:19Z

The Lambda Sensor

← Older revision		Revision as of 09:28, 30 August 2006
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	==The Lambda Sensor==		==The Lambda Sensor==

	Otherwise known as an Oxygen Sensor or a HEGO sensor (Heated Exhaust Gas Oxygen), the Lambda sensor returns a voltage signal which is a non-linear function of the amount of oxygen present in the exhaust		Otherwise known as an [[Lambda Sensor\|Oxygen Sensor]] or a HEGO sensor (Heated Exhaust Gas Oxygen), the [[Lambda sensor]] returns a voltage signal which is a non-linear function of the amount of oxygen present in the exhaust

	[[Category:Exhaust]]		[[Category:Exhaust]]

cocjh1 at 17:12, 10 August 2006

2006-08-10T17:12:18Z

← Older revision		Revision as of 17:12, 10 August 2006
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	Otherwise known as an Oxygen Sensor or a HEGO sensor (Heated Exhaust Gas Oxygen), the Lambda sensor returns a voltage signal which is a non-linear function of the amount of oxygen present in the exhaust		Otherwise known as an Oxygen Sensor or a HEGO sensor (Heated Exhaust Gas Oxygen), the Lambda sensor returns a voltage signal which is a non-linear function of the amount of oxygen present in the exhaust

			[[Category:Exhaust]]

Andy R at 11:42, 8 June 2006

2006-06-08T11:42:55Z

← Older revision		Revision as of 11:42, 8 June 2006
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	~~MoT Emissions Testing~~		==Introduction==

	Passing ones MoT emissions test with ones Elise appears to be an annual trauma. This page is the beginnings of a 'how-to' guide of hints and tips to help you through.		Passing ones MoT emissions test with ones Elise appears to be an annual trauma. This page is the beginnings of a 'how-to' guide of hints and tips to help you through.

			==A Brief Overview of Emissions Control==

			Combustion engines of all types generally burn hydrocarbons (HC)as their primary fuel source.

			In the limiting case, hydrocarbons combine with ambient oxygen (O2) to create carbon dioxide (CO2) and water (H2O), however an internal combustion engine is never 100% efficient and this chemical reaction usually has some incomplete products, namely carbon monoxide (CO) and unburned hydrocarbons (uHC).

			In addition, the normally inert nitrogen (N2) in the air forms oxides of nitrogen (NOx) during the high temperature and pressure phases of the combustion process.

			cont...

			==The Lambda Sensor==

			Otherwise known as an Oxygen Sensor or a HEGO sensor (Heated Exhaust Gas Oxygen), the Lambda sensor returns a voltage signal which is a non-linear function of the amount of oxygen present in the exhaust

Andy R: SELOC TechWiki:Searching moved to Passing your MoT Emissions Test: cocked up setting up this page

2006-06-08T11:34:02Z

SELOC TechWiki:Searching moved to Passing your MoT Emissions Test: cocked up setting up this page

← Older revision	Revision as of 11:34, 8 June 2006
(No difference)

Andy R at 11:30, 8 June 2006

2006-06-08T11:30:00Z

New page

MoT Emissions Testing

Passing ones MoT emissions test with ones Elise appears to be an annual trauma. This page is the beginnings of a 'how-to' guide of hints and tips to help you through.