O2 Sensors
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Novice
Joined: Feb 2011
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O2 Sensors
I have a 09 serg and yesterday it started to run very hot and loss power.I got it home and checked it and found it was so hot the paint on the starter blistered,I pulled the plugs and found them both to be pure white,this happen to to me before but I had a power commander that failed and the o2 sensors were unhooked,Went back to a tts tuner and have had no problems till now.When the tuner tuned it with the tts he said one of my o2 sensors was bad and replaced it with a used one he had handy.My question is if 1 o2 sensor goes bad will bot cylinders run lean.and second question how hard is it to replace the 110 with a 103 .110 to hot ,to noisy ,to many brakedowns.
Road Master
Joined: Nov 2008
Posts: 1,071
Likes: 109
From: LA - (Lower Alabama)
When O2 sensors fail the motor should be running rich. I think it is another issue. Maybe the map in your ECM became corrupted, I would redownload the last map and make sure it is current.
Running lean means fuel issue if too much air. I would start looking around there. Fuel pump, fuel filter or fuel injectors.
Running lean means fuel issue if too much air. I would start looking around there. Fuel pump, fuel filter or fuel injectors.
Novice
Joined: Apr 2013
Posts: 18
Likes: 0
From: Long Beach
isolators
When O2 sensors fail the motor should be running rich. I think it is another issue. Maybe the map in your ECM became corrupted, I would redownload the last map and make sure it is current.
Running lean means fuel issue if too much air. I would start looking around there. Fuel pump, fuel filter or fuel injectors.
Running lean means fuel issue if too much air. I would start looking around there. Fuel pump, fuel filter or fuel injectors.
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Road Master
Joined: Nov 2008
Posts: 1,071
Likes: 109
From: LA - (Lower Alabama)
I would assume that like a car, the ECM would default to a rich condition with an O2 sensor failure. It would throw a code of course too. In cars when the O2 sensor fails the gas mileage goes down. Just google poor mileage and O2 sensor. So yes, in open loop with no O2 feedback the ECM has to default to something and rich would be better than lean which would cause increased engine temps.
Last edited by tully_mars; Jun 4, 2013 at 05:59 AM.
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Novice
Joined: Apr 2013
Posts: 18
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From: Long Beach
I would assume that like a car, the ECM would default to a rich condition with an O2 sensor failure. It would throw a code of course too. In cars when the O2 sensor fails the gas mileage goes down. Just google poor mileage and O2 sensor. So yes, in open loop with no O2 feedback the ECM has to default to something and rich would be better than lean which would cause increased engine temps.
Road Master
Joined: Nov 2008
Posts: 1,071
Likes: 109
From: LA - (Lower Alabama)
In short, there is no way to compare what signal the O2 sensors are sending without hooking up diagnostic equipment and documenting the changes in conditions to the response of the richness of the motor.
This next statement is a guess on my part, but I would think the Power Commander isolators would lean out the ECM so the Power Commander unit could then only concentrate on adding fuel with its internal map corrections vs adding or subtracting on a map. This would be simpler to program and develop rather than having to calculate deviation from mid range richness and then decide whether to add or subtract fuel based on the ECM output. So if you were running the isolators without the Power Commander it could be running really lean. Just brainstorming some thoughts....
Last edited by tully_mars; Jun 7, 2013 at 09:05 AM.