Engine: Oxygen Sensors (O2) - Revision history

Stealthify: /* Related Articles */

2013-02-09T04:27:22Z

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Stealthify: /* Related Articles */

2013-02-09T04:27:08Z

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Stealthify: Added related articles

2013-02-09T04:26:42Z

Added related articles

Stealthify: Correction

2013-02-08T07:37:52Z

Correction

Stealthify: Added photo/additional info

2013-02-08T07:35:48Z

Added photo/additional info

Stealthify: Created page with "Category:Information Category:Engine At cold engine start-up the O2 sensor output will show rich (voltage near 1.0) then probably switch to lean (voltage near 0.0) and..."

2012-07-04T02:08:28Z

Created page with "Category:Information Category:Engine At cold engine start-up the O2 sensor output will show rich (voltage near 1.0) then probably switch to lean (voltage near 0.0) and..."

New page

[[Category:Information]]
[[Category:Engine]]
At cold engine start-up the O2 sensor output will show rich (voltage near 1.0) then probably switch to lean (voltage near 0.0) and slowly move toward the rich end. As the engine warms, usually above 168° F coolant temp, the voltage will quickly start to cycle (low to high to low to high, etc.). This is absolutely normal, as the ECU is using the O2 sensor voltage in a closed-loop feedback to increase a little then decrease a little the fuel injector pulse width in an attempt to achieve the ideal 14.7:1 mixing ratio. As the engine RPM slowly increase, the cycling rate of the lights will also increase. Compare at idle and at steady 3000 RPM with the car parked. If the engine RPM increase rapidly (car stationary) or the car is accelerating, the O2 voltage will indicate a rich condition (voltage above 0.8 or so). When the throttle is closed rapidly, the O2 voltage will show lean (voltage at or near 0) because the injectors are being shut off by the ECU. At low-load cruising and light acceleration, the voltage should cycle low-high-low-high, etc.

@@ Line 37: / Line 37: @@
 == Related Articles ==
-* [[Exhaust:_Gut_Precats|How to access the Oxygen Sensors while Gutting the Precats]]
+* [[Exhaust:_Gut_Precats|How to Access the Oxygen Sensors while Gutting the Precats]]
 * [[Tuning:_Install_Wideband_Oxygen_Sensor_(O2)|How to Install a Wideband Oxygen Sensor (O2)]]
 * [[Tuning:_Install_AEM_Duel_Wideband_UEGO_O2_Sensors|How to Install a AEM Wideband UEGO Oxygen Sensr (O2)]]

@@ Line 37: / Line 37: @@
 == Related Articles ==
-* [[Exhaust:_Gut_Precats|Accessing the Oxygen Sensors while Gutting the Precats]]
+* [[Exhaust:_Gut_Precats|How to access the Oxygen Sensors while Gutting the Precats]]
 * [[Tuning:_Install_Wideband_Oxygen_Sensor_(O2)|How to Install a Wideband Oxygen Sensor (O2)]]
 * [[Tuning:_Install_AEM_Duel_Wideband_UEGO_O2_Sensors|How to Install a AEM Wideband UEGO Oxygen Sensr (O2)]]

← Older revision		Revision as of 04:26, February 9, 2013
Line 34:		Line 34:

	As the engine's RPM increases slowly, the cycling rate of the voltage will also become more rapid. However, if the engine RPM increases rapidly (while the car is stationary or while it is accelerating), the O2 sensors' voltage will indicate a rich condition (with a voltage around 0.8 or so). When the throttle is closed rapidly, the O2 sensors' voltage will show lean (voltage at or near 0.0) because the fuel injectors are being shut off by the ECU. At low-load cruising and light accelerating, the voltage should cycle between low and high.		As the engine's RPM increases slowly, the cycling rate of the voltage will also become more rapid. However, if the engine RPM increases rapidly (while the car is stationary or while it is accelerating), the O2 sensors' voltage will indicate a rich condition (with a voltage around 0.8 or so). When the throttle is closed rapidly, the O2 sensors' voltage will show lean (voltage at or near 0.0) because the fuel injectors are being shut off by the ECU. At low-load cruising and light accelerating, the voltage should cycle between low and high.
		+
		+
		+	== Related Articles ==
		+	* [[Exhaust:_Gut_Precats\|Accessing the Oxygen Sensors while Gutting the Precats]]
		+	* [[Tuning:_Install_Wideband_Oxygen_Sensor_(O2)\|How to Install a Wideband Oxygen Sensor (O2)]]
		+	* [[Tuning:_Install_AEM_Duel_Wideband_UEGO_O2_Sensors\|How to Install a AEM Wideband UEGO Oxygen Sensr (O2)]]

← Older revision		Revision as of 07:37, February 8, 2013
Line 5:		Line 5:
	An '''oxygen sensor''' (also known as an '''O2 sensor''' or '''lambda sensor''') is an electronic device that samples the gasses passed through the exhaust system in order to determine, in real time, if the air-fuel ratio of the engine is rich or lean. The sensors' purpose is to provide readings that will help the engine run efficiently and to produce as few emissions as possible.		An '''oxygen sensor''' (also known as an '''O2 sensor''' or '''lambda sensor''') is an electronic device that samples the gasses passed through the exhaust system in order to determine, in real time, if the air-fuel ratio of the engine is rich or lean. The sensors' purpose is to provide readings that will help the engine run efficiently and to produce as few emissions as possible.

−	The optimal air/fuel ratio that [[Mitsubishi_3000GT/Dodge_Stealth\|Mitsubishi 3000GT]]/[[Mitsubishi_GTO\|GTO]] and [[Mitsubishi_3000GT/Dodge_Stealth\|Dodge Stealth]]'s on regular gas aim for is 14.7:1. This is what is known as the stoichiometric mixture (~~usually~~ depicted as 'Stoich' on most air/fuel gauges). These gauges generally consider the range of 13.0:1 to 17.0:1 to be 'Stoich', while anything below 13.0:1 is rich, and anything above 17.0:1 is considered lean.	+	The optimal air/fuel ratio that [[Mitsubishi_3000GT/Dodge_Stealth\|Mitsubishi 3000GT]]/[[Mitsubishi_GTO\|GTO]] and [[Mitsubishi_3000GT/Dodge_Stealth\|Dodge Stealth]]'s on regular gas aim for is 14.7:1. This is what is known as the stoichiometric mixture (depicted as 'Stoich' on most air/fuel gauges). These gauges generally consider the range of 13.0:1 to 17.0:1 to be 'Stoich', while anything below 13.0:1 is rich, and anything above 17.0:1 is considered lean.

@@ Line 1: / Line 1: @@
 [[Category:Information]]
 [[Category:Engine]]
-At cold engine start-up the O2 sensor output will show rich (voltage near 1.0) then probably switch to lean (voltage near 0.0) and slowly move toward the rich end. As the engine warms, usually above 168° F coolant temp, the voltage will quickly start to cycle (low to high to low to high, etc.). This is absolutely normal, as the ECU is using the O2 sensor voltage in a closed-loop feedback to increase a little then decrease a little the fuel injector pulse width in an attempt to achieve the ideal 14.7:1 mixing ratio. As the engine RPM slowly increase, the cycling rate of the lights will also increase. Compare at idle and at steady 3000 RPM with the car parked. If the engine RPM increase rapidly (car stationary) or the car is accelerating, the O2 voltage will indicate a rich condition (voltage above 0.8 or so). When the throttle is closed rapidly, the O2 voltage will show lean (voltage at or near 0) because the injectors are being shut off by the ECU. At low-load cruising and light acceleration, the voltage should cycle low-high-low-high, etc.
+[[File:3000GT-Stealth_O2_Sensor_OEM_Diagram.png|thumb|400px|3000GT/Stealth OEM O2 Sensor Diagram]]