Fitted exhaust, now lambda sensor error - Page 3 - MVAgusta.net
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post #21 of 28 (permalink) Old 06-07-2018, 08:29 AM
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@TruffleShuffle: would you please post your model and year in your signature line? It would make helping you much easier than attempting a guess at what model/year you may have.

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post #22 of 28 (permalink) Old 06-07-2018, 09:11 AM Thread Starter
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Done!

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post #23 of 28 (permalink) Old 06-07-2018, 09:20 AM
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post #24 of 28 (permalink) Old 06-07-2018, 12:13 PM
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Quote:
Originally Posted by TruffleShuffle View Post
Having done a little research it appears the thread size is 12mm (as apposed to the four cylinder bikes which use a 18mm thread)
The 2010 F4 bikes had a 18mm sensor based on the headers I've removed the CATs from, the 2015 F4 was a 12mm sensor, so I assume post 2013 were 12mm when they changed to the Eldor ECU.

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post #25 of 28 (permalink) Old 06-11-2018, 07:00 AM Thread Starter
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I'm probably tempting fate here, but the last couple of days have been error free!

Came home on Thursday after a short ride, filled up with fuel and the lambda sensor error didn't come back on. After today's ride it still hasn't come back on.

I don't know if the exhaust has just 'settled in' or the lambda sensor has adjusted to the flow? Still feels a little 'laggy' at the bottom end, I must say - maybe it was always this way.

On the weekend I took the time to remove the ECU and give the connectors a good lick of dielectric grease. No throttle error today. Long may the days of no errors continue :-)

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post #26 of 28 (permalink) Old 06-11-2018, 07:13 AM
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That sounds like good news.... maybe the sensor cleaned itself of some contaminant...or you fixed the poor connection.

Most of the EFI sensors on our bikes are the same technology and often the same parts as automobiles use. Exposed to the elements more, but otherwise the same. Cars go hundreds of thousands of miles trouble free. So should our motorcycles.

99.9% of the time a fault with an EFI sensor is caused by a poor connection. They do work on very small voltages and current, so any added resistance in the system will cause a problem.

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post #27 of 28 (permalink) Old 06-11-2018, 10:11 AM
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For future reference:


Do not use any contact cleaner or other spray cleaners etc on the oxygen sensor connector. The way an O2 sensor works is buy "comparing" the outside air with the inside air. It gets the outside air by way of the wiring going to the sensor. So, if you spray anything that can wick its way to the sensor itself it will possibly ruin the sensor. You will notice in universal kit that they give a mechanical connector and say not to solder the connection. This is for that same reason of possibly having something travel the wire and ruin the sensor materials.



You may have sprayed something to ease the exhaust removal and it got on the sensor or connector? It has burned off but most likely that sensor will fail sooner rather than later.



Quote:
Originally Posted by TruffleShuffle View Post
😁

Thanks for pointing that one out, I somehow missed it.

I've actually stuffed a load of dialectrical grease into the connector to see if that has any effect.

Not having much luck with this bike so far! My last bike was a 10 year old multistrada, and the only problem in two years was a couple of blown bulbs!!

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post #28 of 28 (permalink) Old 06-11-2018, 10:29 AM
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Here is some interesting reading about failures of oxygen sensors:

Normally, the lifetime of an unheated sensor is about 30,000 to 50,000 miles (50,000 to 80,000 km). Heated sensor lifetime is typically 100,000 miles (160,000 km). Failure of an unheated sensor is usually caused by the buildup of soot on the ceramic element, which lengthens its response time and may cause total loss of ability to sense oxygen. For heated sensors, normal deposits are burned off during operation, and failure occurs due to catalyst depletion. The probe then tends to report lean mixture, the ECU enriches the mixture, the exhaust gets rich with carbon monoxide and hydrocarbons, and the fuel economy worsens.

Leaded gasoline contaminates the oxygen sensors and catalytic converters. Most oxygen sensors are rated for some service life in the presence of leaded gasoline, but sensor life will be shortened to as little as 15,000 miles (24,000 km), depending on the lead concentration. Lead-damaged sensors typically have their tips discolored light rusty.

Another common cause of premature failure of lambda probes is contamination of fuel with silicones (used in some sealings and greases) or silicates (used as corrosion inhibitors in some antifreezes). In this case, the deposits on the sensor are colored between shiny white and grainy light gray.

Leaks of oil into the engine may cover the probe tip with an oily black deposit, with associated loss of response.

An overly rich mixture causes buildup of black powdery deposit on the probe. This may be caused by failure of the probe itself, or by a problem elsewhere in the fuel-rationing system.

Applying an external voltage to the zirconia sensors, e.g. by checking them with some types of ohmmeter, may damage them.

Some sensors have an air inlet to the sensor in the lead, so contamination from the lead caused by water or oil leaks can be sucked into the sensor and cause failure.
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