Low end sputter, hesitation

[mininsx_imp]

So what was the conclusion of the OP?

1. Installing an O2 eliminator (a resistor) can soften snatchy throttle response, especially at small throttle openings or on/off throttle. It can also fix the hunting/surging that some folks experience at small throttle openings.

2. It is not necessary to physically remove the O2 sensor, and it's a royal PITA to do so unless you have the right slotted wrench. (This is somewhat controversial -- some people posit that physical removal is smart because the O2 sensor will "fail" if it's not connected to the ECU. I respectfully disagree, because I can't see why that would be true. The O2 sensor is not heated or cleaned by dint of being hooked up to the ECU).

3. Installing an O2 eliminator will make your bike run richer and therefore cooler and may slightly adversely affect fuel economy (I found it negligible or non-existent, but YMMV. In fact, I experienced a slight increase in fuel economy, but that makes zero sense and I can't explain it so I chalk it up to user error).

4. If your bike fuels nicely with the stock setup, don't bother with the O2 eliminator. If, on the other hand, you have fueling problems at low throttle, it's a cheap experiment to see if it fixes the problem (it seems like it usually does).

5. Many aftermarket or race exhaust systems require or include an O2 eliminator, and simply do not have a physical threaded hole for the O2 sensor.

I'd welcome disagreement on any of those ideas, but that's what I got from reading the thread and my own experiments! Ride safe and have fun.

1. Installing an O2 eliminator (a resistor) can soften snatchy throttle response, especially at small throttle openings or on/off throttle. It can also fix the hunting/surging that some folks experience at small throttle openings.

2. It is not necessary to physically remove the O2 sensor, and it's a royal PITA to do so unless you have the right slotted wrench. (This is somewhat controversial -- some people posit that physical removal is smart because the O2 sensor will "fail" if it's not connected to the ECU. I respectfully disagree, because I can't see why that would be true. The O2 sensor is not heated or cleaned by dint of being hooked up to the ECU).

3. Installing an O2 eliminator will make your bike run richer and therefore cooler and may slightly adversely affect fuel economy (I found it negligible or non-existent, but YMMV. In fact, I experienced a slight increase in fuel economy, but that makes zero sense and I can't explain it so I chalk it up to user error).

4. If your bike fuels nicely with the stock setup, don't bother with the O2 eliminator. If, on the other hand, you have fueling problems at low throttle, it's a cheap experiment to see if it fixes the problem (it seems like it usually does).

5. Many aftermarket or race exhaust systems require or include an O2 eliminator, and simply do not have a physical threaded hole for the O2 sensor.

I'd welcome disagreement on any of those ideas, but that's what I got from reading the thread and my own experiments! Ride safe and have fun.
I bought one a couple of months ago and found the same results as above. The surging is gone and the engine runs like it should have from day one. Gas mileage is the same, too.

[Inhouse Bob]

whats the throttle trick?

Turn key on, twist throttle to full and back twice, turn key off, then back on and start. Supposedly this resets the tps.

Turn key on, twist throttle to full and back twice, turn key off, then back on and start. Supposedly this resets the tps.
Going way back for this question. What is the "TPS" and why does it need resetting? Also, I saw somewhere on this thread that there might be more than one place to plug in the O2 sensor eliminator... with only one being correct. Anyone got a photo of this install, or does the eliminator come with good, clear instructions? I'm paranoid, but that doesn't mean they aren't out to get me

[WhiskeyUSMC1979_imp]

TPS = Throttle Position Sensor


Sent from an undisclosed location

[Lord Popgun]

Like Whiskey said, it is the Throttle Position Sensor. It tells the ECU the position of the throttle. You can see it on the left side of your bike. On the left side between the head and airbox. It is black and has a connector on it.

You car or truck and maybe your outboard has one too.

You don't actually reset the TPS, but rather its function. Doing the reset tells the ECU the TPS voltage range from min. to max. Being simplistic, the ECU uses the TPS to know how much fuel to inject.

Does the reset work on our bikes? Don't know. It is not referenced in the manual. Most of us that have done it have seen results, and is a procedure on other bikes according to our knowledgeable members.

A couple of users have adjusted the TPS by loosening the screws and physically moving the TPS. This is specifically prohibited in the service manual as it is set at the factory and 1. never needs service, and 2. Can't be replaced by itself. Neither of those is necessarily true.

[Inhouse Bob]

Interesting. Thanks. I have no reason to think anything needs adjusting on my bike, but I'll file this under "stuff I might need to know someday!"

[mininsx_imp]

whats the throttle trick?

Turn key on, twist throttle to full and back twice, turn key off, then back on and start. Supposedly this resets the tps.

Turn key on, twist throttle to full and back twice, turn key off, then back on and start. Supposedly this resets the tps.
Going way back for this question. What is the "TPS" and why does it need resetting? Also, I saw somewhere on this thread that there might be more than one place to plug in the O2 sensor eliminator... with only one being correct. Anyone got a photo of this install, or does the eliminator come with good, clear instructions? I'm paranoid, but that doesn't mean they aren't out to get me

Turn key on, twist throttle to full and back twice, turn key off, then back on and start. Supposedly this resets the tps.
Going way back for this question. What is the "TPS" and why does it need resetting? Also, I saw somewhere on this thread that there might be more than one place to plug in the O2 sensor eliminator... with only one being correct. Anyone got a photo of this install, or does the eliminator come with good, clear instructions? I'm paranoid, but that doesn't mean they aren't out to get me
The O2 eliminator does not come with instructions, but it's very easy to install. Remove the right side cover then follow the wire from the O2 sensor and the plug is under the right side cover. Unplug the sensor, plug in the eliminator and you're done.

[Inhouse Bob]

The O2 eliminator does not come with instructions, but it's very easy to install. Remove the right side cover then follow the wire from the O2 sensor and the plug is under the right side cover. Unplug the sensor, plug in the eliminator and you're done.
[/quote]

Thanks. I'll open her up and see what's what. Thanks for assuming I'm bright enough to get this done

[Inhouse Bob]

All righty! I received my O2 sensor eliminator today and, as everyone said, it was a quickie install. I then took a 30 minute tour of the town and it proved enlightening.
I have never felt real comfortable putting along on this bike because of... I dunno what. It always felt like the bike couldn't decide what it wanted throttle-wise. But the only bike I've put any miles on lately is my KLR, and it is carbureted and a single to boot. I figured that it was just the nature of a FI system. Well, now I know better.
Highly scientifical seat-o-the-pants testing tells me that I will enjoy the bike more now. It isn't so "jumpy" when applying small throttle adjustments, it will idle along at 10-15 MPH without the little surges and hesitations, and (though I don't know why) it seems to downshift more smoothly. Before, especially at low speeds, downshifting took some concentrated throttle modulation to get a smooth shift. It felt like the engine would instantly drop to idle when letting off the throttle, causing a lot of herky-jerky engine braking unless I got the throttle just so. Maybe I was just being extra careful today, but it feels better now.
So, that's my two cents. Thanks to whoever came up with this simple, cheap fix!

[Gumby 1100_imp]

I have to concur with Inhouse Bob!

After delaying the install of my O2 Eliminator Plug for several months (long enough to do the_undecider proud), I cannot believe that I waited this long!

I bought it on a whim because I never thought that I had any real fueling issues...no real surging (speed/rpm fluctuations) or low speed drivability issues....or so I thought. Adding this simple plug was literally like installing a poor man's Power Commander!


I realize now that the O2 sensor was causing the fueling to lean out or shut off abruptly every time I rolled off the throttle. With the plug, shifting is now much easier to rev match and engine braking is reduced which greatly smooths out the driving experience.

Previously, driving at low speeds in first and especially in second was harsh, raspy and abrupt (clearly it was running too lean). I had to formerly stay on the throttle and precisely balance clutch feathering, especially when cornering, but no more. I can now effortlessly tool around in second and cornering is much more relaxing.

After one tank of gas, my mileage does not seem to have dropped off noticeably, if at all...more driving will be required, and it will definitely be more enjoyable!

Arguably, an O2 Eliminator Plug is the best bang for the buck on a CB1100. Even as just an experiment, it is well worth the few dollars and the few minutes it takes to install.

................................................................................​..........

As per The Ferret's excellent suggestion:

O2 Sensor Eliminator Plug Link: http://www.ebay.co.uk/itm/o2-Oxygen-Lamb...339ac11f47

I found the photos on the UK forum, hopefully they show enough detail...if not, I'll take some of my own.

In short:

1) Remove Right Side Cover
2) Disconnect O2 Lambda Sensor (Trace the line down to the header just to be safe and to be sure it is the right connector)
3) Plug in the Sensor Eliminator
4) I Put a small plastic bag over the side of the connector leading to the O2 Lambda Sensor to keep moisture out and in case I needed to reconnect it (such as if an EPA emissions test was ever required).

[the Ferret]

So why dont one of you enlightened guys do a "How To" for the forum on installing one of these things with pics. Bet there would be guys that would appreciate it! I know I for one have no idea what part you are talking about or where it goes, where to buy it, or how to install it. Thinking I'm not the only one.