2010 390 Lambda/O2 sensor

Where is my Lambda/O2 sensor?
The manual shows the sensor near the spark plug in the second section of the exhaust pipe.

Thanks,
Todd

I didn't think any of the 2010's came with a lambda sensor. All of the other 2010's did not come with them I am 99% sure.

The picture you posted is right where it should be.

My 2010 390 (but EU version) has this sensor.

Anyone know why the US versions did not get the lambda sensor and the EU bikes did?
Anyone know the reason for lambda or not to lambda sensor?

ninayu61 said:

Anyone know why the US versions did not get the lambda sensor and the EU bikes did?

Click to expand...

I don't really know but would take a guess it might have something about meeting government emission regulations. IMHO (could be wrong) an EFI system setup with a O2 sensor in theory would have a better chance of meeting regulations

ninayu61 said:

Anyone know the reason for lambda or not to lambda sensor?

Click to expand...

The Lambda Sensor or as it is also known O2 Sensor or Oxygen Sensor is there to measure the unburnt fuel in the exhaust system. The O2 sensor outputs a very small voltage according to the ratio of air and fuel (maybe oxygen and fuel I am not a scientist so not 100% sure on that bit) in the exhaust system. That voltage is fed into the Keihin EFI computer under the seat.


EFI Computers work in 2 modes. Open Loop and Closed Loop.

Open Loop is without the input of an O2 Sensor. This works fine and is used in many EFI systems. Some of the most powerful EFI Twin Turbo Big Block Chevs boats that I have seen run Open Loop EFI mode without the use of an O2 sensor. I run Open Loop in my Fuel Injected Boat. Open Loop is just more simple/basic and works perfect.

Closed Loop is when the EFI system looks at the input of the O2 sensor and makes fine adjustments to richen or lean out the engine. It is normally only done on light/coasting type engine loads or deceleration (going Down Hill). When held at Wide Open Throttle (WOT) the Closed Loop EFI systems as I understand it goes back to Open Loop mode and ignore the O2 sensors input.
"Closed Loop" means the engine looks at all the sensors (but not the O2 sensor) and the result is to fire the Fuel Injector and then takes a reading via the O2 Sensor in the exhaust to look at the result of what it did, and feeds the info back in the ECU and make an adjustment if required for next time it fires the Fuel Injector. The ECU fires the Injector, looks at the O2 Sensor and potentially changes what it does next time based on what is sees from the O2 sensor. It "loops" the information back into the ECU.
The ECU can keep the Injector open for a shorter period to make a leaner mixture or hold the Injector open for a longer period to make the mixture richer.

The "legal" EU version to have it plated has the small catalic conventer just before exhaust can. There is as well some stuff on the cylinder head called SAS system and the plastic cap on the air filter. The "green" map is on the ECU.
When you decide to have full competition version the dealer removes all that stuff but the lambda sensor/O2 is still in place. The dealer programmes the ECU with the competition map. I don't know if the O2 sensor is still active in this mode.

Thanks for all the answers!

After researching this too much I was able to gain this understanding. The 2010 2011 and 2012 USA models will not have the lambda/O2 sensor.

After the bike has warmed up, the EFI system will go into a closed loop setting and will use several sensors to determine the correct amount of fuel to inject:
1. Manifold Absolute Sensor (MAP)-Enables the system to determine the air density (accounts for attitude, barometric pressure, humidity)
2. Temperature sensor- Enables the system to determine the air temperature in the air box just prior to the throttle body.
3. RPM calculation (based upon spark)

In a nutshell, using air density (1 &2) and rate air enters the engines (RPM x displacement) the computer determines the fuel required.

While there is a fine tuning that can be provided by a lambda/O2 sensor most EFI systems will disregard the lambda input at Wide Open Throttle (WOT).

The way I see it, I have one less part that will fail.

Thanks again for all the input to help me understand the world of EFI.

ninayu61 said:

After the bike has warmed up, the EFI system will go into a closed loop setting and will use several sensors to determine the correct amount of fuel to inject:
1. Manifold Absolute Sensor (MAP)-Enables the system to determine the air density (accounts for attitude, barometric pressure, humidity)

Click to expand...

Just my opinion (could be wrong) but I don't believe the MAP (Manifold Absolute Pressure) sensor is used in the Husabergs for anything after slight Throttle openings. After slight Throttle opening, the Throttle Postion Sensor (TPS) is used.

I also don't understand how the MAP sensor can adjust for altitude. So I have my doubts on that subject too.

Davo :confused2: