Not sure how it relates to speedmasters, but early EFI bonnevilles only use the o2 sensors at relatively low throttle inputs to run in a closed loop system. After about 6% throttle, the ecu switches to open loop and no longer uses readings from the o2 sensors. Some folks contribute the closed loop system to the 'snatchyness' with small throttle inputs, and say removing o2 (and disabling them in your ECU to prevent check engine light) can smoothen out the low speed jerkyness a bit.
Tyler Kohler
Jeff - you are the lucky winner! :)I have my bike at the dealer for 12K service (plus new tires) -- and the problem was related to the oxygen sensor. Replacement part being ordered, hope to have the bike back soon.Now for a different but related question - I've seen a number of posts from folks who have actually removed their O2 sensors for better performance. Is this advisable? Not that I'm going to do it, just curious if others have...-peltz.
On Wednesday, November 4, 2015 at 4:35:37 PM UTC-7, jeffswalters wrote:Rin it by the dealer and they can scan the code to see what it is. Check engine could be low oil or possible oxygen sensor.
Sent from my Galaxy S®III
-------- Original message --------From: Norm WrightDate:11/04/2015 1:51 PM (GMT-07:00)Subject: RE: [emrat:7987] Engine Light
--Unfortunately, from my experience, the number one reason lights come on is a defect in the sensors/light, not a real problem. Check your oil level too. Which can be a reason they come on. I assume you do not have tire pressure sensors, then it could be a soft tire.
From: em...@googlegroups.com [mailto:em...@googlegroups.com] On Behalf Of Chris Peltz
Sent: Wednesday, November 4, 2015 3:48 PM
To: em...@googlegroups.com
Subject: [emrat:7986] Engine Light
My engine light turned on during my ride back to Denver this morning. I've never had the light turn on my Speedmaster, so just trying to figure out what might be going on.
I was already planning to take the bike in for its 12K service, but if anyone can explain under what circumstances this typically occurs, that would help me.
Thanks.
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