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Old September 14th, 2018, 07:16 AM   #31
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I Ride: 2013 hypermotard/hyperstrada, 2005 zx6r, drz125, crf50 crf70
Quote:
Originally Posted by mentalist View Post
if the engine doesn't detect the sensors when the sensors are disconnected, it defaults to running in safe mode, not necessarily optimum running mode. That's why the bike runs better.
Same as a mass air flow meter, if they are faulty, cars tend to run like a bag of shite, but disconnected puts them in default safe mode, so the engine does run better, but it again not at its best.
In simple terms, if disconnecting your lambda sensors makes your bike run better, you know one or both need replacing. Don't just rely on the safe running mode by leaving them off.
If the Rapid Bike didn't need these O2 signals then it would have come with blanking plugs like a power commander 5.
Instead of a blanking plug the just have a button to check when uploading the map. It recommends having the ecu reprogrammed to disable the o2 sensor though. I know that I should replace them and I will but I am running the bike with them unplugged till then

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Old September 14th, 2018, 07:39 AM   #32
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So have I solved your problem then from your original post. You where under the impression that the throttle position sensor was at fault???
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Old September 14th, 2018, 07:56 AM   #33
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So have I solved your problem then from your original post. You where under the impression that the throttle position sensor was at fault???
Gotham cycle has ruled out the TPS on the throttle bodies as well. What would you say the issue is then? My thought is that the o2 sensors are the defective pieces causing my problems and that is why the bike runs good with them un plugged. Gotham cycle(the main trouble shooting and supplier of most ducati sensors fir the other bikes) also suggested that it could be a faulty connector elsewhere in the wiring but the only connector that is between the rapidbike wiring harness and the sensor is the sensor itsself.

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Old September 14th, 2018, 08:02 AM   #34
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Have you checked the resistance? also check the wiring back to the rapid bike evo module.
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Old September 14th, 2018, 08:54 AM   #35
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Have you checked the resistance? also check the wiring back to the rapid bike evo module.
I have. The resistance between pin 1 and 2 (out of the 4 pin connector) is 17ohm and when heated up jumps to 21ohm. The rest of the pins have no continuity between them. Both sensors have the same reading. I swapped them front to back to see if it made a difference but it didnt. I went through every connector on the bike when I cut the wiring harness open. I cut a razor blade down to fit into each of the female connectors. I also thinned the blade using my cut off wheel. It made a cross hatch pattern on both surface. The idea was to make something that would clean the female connector without over extending the connector past the point that the Male portion would do but still be able to feel the resistance of the blade and clean the contact. I did this with every female connector including the ecu plugs. I have been very through with this. Rapidbike and gotham cycle said to make sure there is continuity through each pin of the connector while its plugged in. I soldered needles onto my fluke meter and slightly penetrated the sheath of each wire to assure there was continuity on both lambda o2 sensors.

What did you think solved my problem from the original post? I mentioned that I had it (potentially narrowed down) to the o2 sensors through extensive test, cleaning and rewiring.

Last edited by Araitim; September 14th, 2018 at 08:58 AM.
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Old September 14th, 2018, 09:52 AM   #36
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I think it would be unusual for both to fail at the same time.
I'm offshore at the moment for another two weeks or i'd measure mine to see what the resistance and voltage changes are so you could compare, its about 14 months since I checked and replaced my front sensor and I can't remember what I had for lunch yesterday ;-), so I don't remember the values.
Have you checked the voltage and that it fluctuates rapidly when lean or rich between 0.1 and 0.9V ?
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Old September 14th, 2018, 10:09 AM   #37
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I think it would be unusual for both to fail at the same time.
I'm offshore at the moment for another two weeks or i'd measure mine to see what the resistance and voltage changes are so you could compare, its about 14 months since I checked and replaced my front sensor and I can't remember what I had for lunch yesterday ;-), so I don't remember the values.
Have you checked the voltage and that it fluctuates rapidly when lean or rich between 0.1 and 0.9V ?
I have not. I will have to check that. I have not done any tests to the o2 sensors when the bike is running, only bench testing.
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Old September 14th, 2018, 10:45 AM   #38
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I think mine had open circuit on the heating element
Even when hot
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Old September 15th, 2018, 05:13 PM   #39
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I had intermittent check engine light. I replaced the rear O2 with one from a 821 monster. It's a totally different design but has the same bung size. Upshot is with the Eldor coils & used o2, the bike runs stronger than ever.

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Old September 15th, 2018, 09:08 PM   #40
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Quote:
Originally Posted by ferdi View Post
you are right, but its more healthy for an engine to run rich than lean. and o2 regulations leans out air/fuel ratio to lambda1, which is not really healthy, for any engine.
cars and bikes do not have wideband o2sensors, but only narrowband, which are only able to read air ratios richer or leaner than lambda1. so it always changes ratio leaner leaner leaner - ok - richer -ok - leaner .... so that ratio always is in the near of lambda 1.
if you use a wideband sensor, than you exactly can manage air/fuel ratio for load and rpm, but that's not the case with our bikes. They only have very simple narrowband o2sensors.

but, if you do not know about it und do not believe it - do what you feel is right in your opinion, but please do not tell technicians how engines and fuel injections work and whats good for them.
Ducati engineers and technicians, or after market part technicians?
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