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Old Oct 26, 2016 | 09:29 AM
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I have been having a hell of a time with my swapped 5.3 s10 blazer, long story short it runs very well without O2 sensors hooked up but when I hook the O2 sensors up it sounds like it has a big cam and runs terribly. Here is a link to the thread where I have provided information on this problem https://ls1tech.com/forums/conversio...sor-issue.html

Here are some images of what the system does while it is acting up




























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Old Oct 26, 2016 | 09:30 AM
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This was all in Drive sitting in my driveway.
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Old Oct 26, 2016 | 09:32 AM
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Also just to add, when it does this the truck starts smoking too. Once I disconnect the O2 sensors it clears up and I have driven it 300 miles or so with the O2 sensors disconnected with no problem. These logs were at 153 Degrees F.

Last edited by firstgenon24s; Oct 26, 2016 at 10:03 AM.
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Old Oct 27, 2016 | 08:00 AM
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Any suggestions or help?
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Old Oct 27, 2016 | 03:36 PM
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I am not familiar with the stuff your using but if it runs fine with the 02 unpluged and based on the reading that 1 is pegged a 1 Volt and the other appears to be at .015, I would say there bad. They should cycle up and down as it's running.

You can try pulling the maf plug and see if the 02 sensors are cycling.

If not replace them.
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Old Oct 27, 2016 | 08:03 PM
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Originally Posted by 1FastBrick
I am not familiar with the stuff your using but if it runs fine with the 02 unpluged and based on the reading that 1 is pegged a 1 Volt and the other appears to be at .015, I would say there bad. They should cycle up and down as it's running.

You can try pulling the maf plug and see if the 02 sensors are cycling.

If not replace them.
well that's the thing, they are brand new sensors.
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Old Oct 27, 2016 | 08:34 PM
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I think your O2 sensors are swapped left and right. i.e. wiring harness is crossed.

Last edited by 2xLS1; Oct 27, 2016 at 09:08 PM.
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Old Oct 27, 2016 | 08:38 PM
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Originally Posted by firstgenon24s
well that's the thing, they are brand new sensors.
I have had brand new ones bad right out of the sealed box.

As mentioned above maybe the wiring is swaped side to side.
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Old Oct 27, 2016 | 09:01 PM
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Originally Posted by 1FastBrick
I have had brand new ones bad right out of the sealed box.

As mentioned above maybe the wiring is swaped side to side.
Would there be a way to determine this without swapping the wiring at the ECU? How can I be sure and confirm this?
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Old Oct 27, 2016 | 09:10 PM
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Unplug one side and see if the scanner shows 450MV on the side you unplugged.
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Old Oct 27, 2016 | 10:39 PM
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Originally Posted by 2xLS1
Unplug one side and see if the scanner shows 450MV on the side you unplugged.
This scanner I'm using doesn't seem to really show me MV of the O2 sensors. I would also assume clearing the codes and hooking up bank 1 (drivers side) sensor and if it doesn't show up as in trouble that would work too?
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Old Oct 27, 2016 | 10:43 PM
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Originally Posted by firstgenon24s
This scanner I'm using doesn't seem to really show me MV of the O2 sensors.
Yes it does. Learn to interpret decimal numbers.
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Old Oct 27, 2016 | 11:09 PM
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Originally Posted by 2xLS1
Yes it does. Learn to interpret decimal numbers.
You're right... haha. Neither one is really in that range currently and I am starting to think the way my scanner reads is not showing the switching of the sensors correctly or something, because I assume they should be up and down a hell of a lot more I thought.

Last edited by firstgenon24s; Oct 27, 2016 at 11:15 PM.
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Old Oct 27, 2016 | 11:44 PM
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Originally Posted by 2xLS1
Unplug one side and see if the scanner shows 450MV on the side you unplugged.
I see what you mean, it should peg out to 450mv if it's not seeing it.
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Old Oct 30, 2016 | 11:35 AM
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Originally Posted by 2xLS1
I think your O2 sensors are swapped left and right. i.e. wiring harness is crossed.
this was it!! Thank you to both of you, swapped the harness wires on 66 and 69 and it runs better than ever, closed loop mode with no problems at all. I owe you both a beer or 10 haha!
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Old Oct 30, 2016 | 08:27 PM
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Glad you found it.
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Old Oct 31, 2016 | 09:31 AM
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Originally Posted by 1FastBrick
Glad you found it.
Thanks man, I appreciate all of the knowledge here.
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