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post #1 of 63 (permalink) Old 05-20-2014, 03:48 PM Thread Starter
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Default O2 sensor disconnect?

I know there are posts on this, but I still can't get a handle on whether or not disconnecting the 106's O2 sensors helps or hurts the stock engine and/or performance.
I bought my 2013 XC used(6k), the dealer was not sure if anything has been done to it. As far as I can tell it has stock parts and no turner is present. However, when I get on it, the exhaust really howls, I get some decel. popping, an occasional "upshift pop" and a slight surging at steady speeds sometimes. I get the feeling the engine is running lean, maybe the previous owner drilled the pipes or added a hiflow af.
I don't want to start buying parts, adding tuners and such but after reading about disconnecting the O2 sensors to cause the engine to run richer for zero $$. I started looking into it and I found lots of conflicting info out there(big surprise, right..)
So here's my questions: Does disconnecting the O2 sensors cause the 106 to run richer? and Can doing this be harmful to the engine?
thanks

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post #2 of 63 (permalink) Old 05-20-2014, 03:53 PM
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Quote:
Originally Posted by PaiN View Post
I know there are posts on this, but I still can't get a handle on whether or not disconnecting the 106's O2 sensors helps or hurts the stock engine and/or performance.
I bought my 2013 XC used(6k), the dealer was not sure if anything has been done to it. As far as I can tell it has stock parts and no turner is present. However, when I get on it, the exhaust really howls, I get some decel. popping, an occasional "upshift pop" and a slight surging at steady speeds sometimes. I get the feeling the engine is running lean, maybe the previous owner drilled the pipes or added a hiflow af.
I don't want to start buying parts, adding tuners and such but after reading about disconnecting the O2 sensors to cause the engine to run richer for zero $$. I started looking into it and I found lots of conflicting info out there(big surprise, right..)
So here's my questions: Does disconnecting the O2 sensors cause the 106 to run richer? and Can doing this be harmful to the engine?
thanks
The engine runs super lean with them connected. The engine runs slightly less lean with them disconnected. The engine does not run rich or anywhere close to being rich either way.

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post #3 of 63 (permalink) Old 05-20-2014, 05:34 PM Thread Starter
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I guess it can't hurt to try......

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post #4 of 63 (permalink) Old 05-20-2014, 08:29 PM
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and in some cases, it actually makes the bike run even leaner...per LLoyd

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post #5 of 63 (permalink) Old 05-20-2014, 09:02 PM Thread Starter
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and in some cases, it actually makes the bike run even leaner...per LLoyd
I knew I shouldn't have asked....In every thing I've read on this subject its the same deal, opinions go from one side to the other.
This one isn't going to be any different.......

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post #6 of 63 (permalink) Old 05-20-2014, 09:14 PM
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Some have reported hair loss, while others have lost or gained weight. Disconnecting them takes about 10 seconds. Ride it for 50 miles or so so the ECM gets a chance to adjust, and if you don't think it's running better, plug them back in, and forget everyone else's results.

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post #7 of 63 (permalink) Old 05-20-2014, 09:45 PM
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Quote:
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and in some cases, it actually makes the bike run even leaner...per LLoyd
Which makes perfect sense. The whole purpose of using real time sensors is to correct for system disturbances that cause the output to veer too far from the desired setpoints...in our case, dictated by an open loop map.

The O2 sensors measure turn on/off when they detect an afr on either side of stoich 14.7:1. The ECU can then use this info to drive the output back to near stoich regardless of the commands directed from the underlying open loop map.

Half Crazy recently witnessed a Vic at a tuning event with unplugged O2s running at 15.5:1!

There are several influential people amongst us who insist that all the O2 sensors do is switch between a lean and a leaner open loop map. No other narrowband feedback system I've read about works in such a manner. I have a hard time Vic engineers would do such a thing even if they could. More than likely, they're buying the same hardware/software from Delphi as everyone else.

I'm with Lloyd.

I recently read a piece from a Harley tuner that said that the Harley open loop map is designed to try to keep the afr output at 14.6:1 across all possible load/rpm conditions. In that case, the sensors should act to just barely fine tune the output to 14.7:1. But should there be a disturbance in the system the drives the output much richer/leaner, the sensors are there to get it back on track.

That is precisely why you'd want to remove the sensors if you have a fuel controller intentionally richening the open loop map mix.




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post #8 of 63 (permalink) Old 05-21-2014, 04:06 AM
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Try disconnecting them and see.....I had no qualms about disconnecting mine

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post #9 of 63 (permalink) Old 05-21-2014, 05:45 AM
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Why not start at the beginning and start investigating to see if you have an altered bike or not. Take the tank off and see if the filter is stock or a K&N style. You don't really need to take the tank off all the way, just enough so you can raise the front and see (white filter is stock, blue or red is aftermarket). Look inside the exhaust. Can you see all the way up it when you shine a light. If so you have some sort of aftermarket pipes. Take the side covers off and see if you see an aftermarket tuner. Don't just start unplugging things because "you think" that might solve the problem.

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post #10 of 63 (permalink) Old 05-21-2014, 05:56 AM
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Quote:
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Why not start at the beginning and start investigating to see if you have an altered bike or not. Take the tank off and see if the filter is stock or a K&N style. You don't really need to take the tank off all the way, just enough so you can raise the front and see (white filter is stock, blue or red is aftermarket). Look inside the exhaust. Can you see all the way up it when you shine a light. If so you have some sort of aftermarket pipes. Take the side covers off and see if you see an aftermarket tuner. Don't just start unplugging things because "you think" that might solve the problem.
Best response I've read yet. You always want to know where your starting before you make adjustments. And verfying what you have (stock or mod) is free and easy.
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