| Author | Message | ||
     Buellish |
When I bought my S3T in 2014 I was told by the owner that I would have to warm it up in his driveway before the test ride.My reply was "I always warm my bikes for a minute and circulate the oil before I ride away",he said "no you don't understand,you need to warm it for five minutes or so and it may still act cold when you ride off".I said "this bike is fuel injected,it should warm quickly".He was right,since I bought it,it has always acted like it needed a choke.It doesn't matter whether it's stone cold or hot from a ride and you just stopped for gas for three minutes,it exhibits a cold naturedness unlike any thing I've ever owned.And it's weird,it will ride away fine initially.nice and smooth but a eighth mile down the road it will start acting like it's fuel starved.you can power through it with the throttle and eventually it will run right. This weekend I got in a conversation with an old friend who has a variety of bikes and he started talking about one of his older Hondas that had a problem that was a known thing on the forums,the fix was to install a Power Commander which came with a harness that fooled the computer into thinking the O2 sensor was still connected.He found out the all the harness did was put a 300 ohm resistor in the O2 connector,so he made his own,didn't buy the Power Commander and fixed the problem. I mentioned that my S3 has this weird problem and thought I would try eliminating the O2 sensor to see what happened.This morning I washed the Buell,dried it,disconnected the sensor and went for a ride.It ran great!I did a ten mile loop,chased a couple of street legal Legends cars down a curvy road and stopped to talk when they pulled over for lunch.The bike sat for maybe 10 minutes and then ran great all the way home.No cold behavior whatsoever.I also don't have a check engine light. What do you guys think,just leave it disconnected?Do you think it will create a rich or lean condition?Was the O2 sensor not working at all?Should I replace the sensor? I would appreciate any and all thoughts. Mike | ||
| Ft_bstrd |
I would assume that disconnecting the O2 sensor input would interfere with the open loop/closed loop air fuel ratio operations. Sounds like you might have a sketchy sensor. Was it throwing any codes before? | ||
| Buellish |
" Was it throwing any codes before?" No,none at all. | ||
| Hootowl |
I believe these non-wideband O2 sensors simply tell the computer whether the mixture is rich or lean, not how rich, or how lean it is. Disconnecting the sensor may simply be telling the computer that it's running lean, and the computer dutifully enriches the mix, and continues to enrich the mix until it hits the limit of how much it can do so thereby 'solving' your lean condition. I would start with some Buell basics. 1. Perform a TPS reset. 2. Reset the adaptive fuel value to 100% 3. Check for, and resolve it necessary, intake seal leaks. Also, ensure that if an aftermarket exhaust has been fitted that the fuel map has been suitable altered. It is entirely possible that your O2 sensor has given up the ghost, but before you throw parts at it, try those three things. Jeff | ||
| Hootowl |
FYI - DDFI2 systems use closed loop mode during a very narrow set of operating conditions, but because the 'learning' that takes place during this window affects additions and subtractions to the fuel map globally (the AFV) a bad O2 sensor can affect operations in open loop mode as well. | ||
| Buellish |
Is resetting the ADV something that can be done with EcmSpy? | ||
| Hootowl |
Though I have never played with ECM spy, I have read posts by many folks on this board saying that you can reset AFV with ECM spy. | ||
| Two_seasons |
Adaptive Fuel Value can be reset to 100. Without the O2 in place (unplugged), ECM will throw 135 AFV IIRC. I would not reset the TPS without having a good O2 sensor connected. | ||
| Buellish |
I'll replace the sensor tomorrow,thanks guys. | ||
| Wolfridgerider |
Is there a non Buell O2 sensor that can be purchased at a auto parts store? | ||
| Two_seasons |
See O2 sensor thread. | ||
| Buellish |
"See O2 sensor thread" I've been trying to get it off.I keep telling it resistance is futile in a very stern voice but so far it's not listening.It's soaking in some penetrant as I type this. | ||
| Buellish |
Well,I took David's advice from the O2 sensor thread,cut the wire on my old sensor and used a 22mm deep well conventional socket and it came right out.I installed a Bosch sensor and road up to TWOS this morning.It's not perfect but it's definitely not acting cold natured anymore.I think I'll take Jeff's direction and reset my TPS and AFV first chance I get. Guys I really do appreciate all your help with this.That's the thing about Badweb,there are a lot of smart people on here that don't mind sharing their knowledge. Thanks again! |
