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O2 sensor? What if we just unplug it for the lean issues?

48335 Views 68 Replies 29 Participants Last post by  SalekS
First post here...had been running drilled stock pipes but just added V&H twin slash pipes and have a ejk tuner on the way. I put the pipes on and took it for a spin with the o2 sensor unplugged since I don't have the fuel programmer yet. I assume the ecu will default to a richer setting similar to the resistor mod for the o2 sensor...Or will it be too rich all over the rpm range? The test ride was only a few miles but seemed to run smoother with less chugging at low rpms in 1st/2nd gear and backfires on decel were not very bad at all. So just a thought for the stock owners looking to do the resistor mod...maybe just unplug it all together.:nod: Please chime in if this has been done, but my search turned up nothing. Maybe it will suck gas like crazy, but don't think so. I didn't ride the bike any more yet and will be a moot point when I get the controller as I have read the o2 sensor gets unplugged anyway.
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Left it unhooked yesterday and no code or CEL. Ejk and bully tuners actually tell you to unplug it. Don't think it will do anything except let it run richer...which is what we want. Ejk sales guy stated it would not throw on a CEL if it is unhooked when I asked about it and others who have the tuner have not had any issues with it being unplugged.
Did you get the chugging before and was the chugging there after you unplugged it??
Yes, it chugged a lot just off idle in 1st and 2nd, much better now after unplugging it. The pipes don't seem to have leaned it out much with the stock air box, but I am either doing the air box mod or adding a big air kit. Anyone know if there is much to gain with a BAK over just modding the stock air box?
Mine ran like crap with o2 sensor plugged in. Would die at stop signs or idle real low and almost die, chugged a lot at low rpm's with stock pipe and intake. Now with ejk kit and twin slash pipes and power flo intake....idle seems a bit faster and very stable, never dies, runs awesome with chugging nearly eliminated. FWIW...
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