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TD header, tune & afpr question

What can I use to clean the O2 sensor?
Ran 180 miles the other day (23°F) and found a lot of carbon on my side panel. Same thing with the O2 sensor.
Will she lean out a little bit in colder weather? Or is there another way to address this?
IMG_20250108_092510572_copy_1536x2048.jpg
 

Doc Harley said:
What can I use to clean the O2 sensor?
Ran 180 miles the other day (23°F) and found a lot of carbon on my side panel. Same thing with the O2 sensor.
Will she lean out a little bit in colder weather? Or is there another way to address this? View attachment 177523
Click to expand...
Maybe turn down your fuel pressure a tad? I thought you posted it was running 11.0 AFR number?
 
Doc Harley said:
What can I use to clean the O2 sensor?
Ran 180 miles the other day (23°F) and found a lot of carbon on my side panel. Same thing with the O2 sensor.
Will she lean out a little bit in colder weather? Or is there another way to address this? View attachment 177523
Click to expand...
Can't clean the working part of an oxygen sensor. What you're looking at in pic is only the outside protective steel covering. The intricate sensing part is inside that shell. If you try to clean it, most likely it will wreck it. Working element runs pretty hot so it likely isn't covered with as much carbon.
If that's an LSU 4.9 Bosch sensor you can find them on eBay for about $28 (genuine Bosch).
If your AFR is too low, you're running rich so you could turn fuel pressure down some, like a pound at a time. WFO should be not more than 12.0 with pump gas (with trusted 91+ octane). Part-throttle, cruise can run all the way up to 14+ with no problem because engine is under light load.
Most tunes we buy from a vendor, WFO AFR is more likely in mid to high 11's to be safe. Can't trust pump gas these days.
 
Last edited:
Turboflash said:
Can't clean the working part of an oxygen sensor. What you're looking at in pic is only the outside protective steel covering. The intricate sensing part is inside that shell. If you try to clean it, most likely it will wreck it. Working element runs pretty hot so it likely isn't covered with as much carbon.
If that's an LSU 4.9 Bosch sensor you can find them on eBay for about $28 (genuine Bosch).
If your AFR is too low, you're running rich so you could turn fuel pressure down some, like a pound at a time. WFO should be not more than 12.0 with pump gas (with trusted 91+ octane). Part-throttle, cruise can run all the way up to 14+ with no problem because engine is under light load.
Most tunes we buy from a vendor, WFO AFR is more likely in mid to high 11's to. E safe. Can't trust pump gas these days.
Click to expand...
I left a last message at about the time this one popped up.
I suppose I'll sit tight and verify. Looks like I might not have enough room to lean it out
 
Doc Harley said:
As of now....
Cold start 11.8 +/-
Cruising 13.8 +/-
W/O 12.0
Jon, you think I still have room to lean her out?
Click to expand...
Only concern for AFR is what its doing WFO IMO. 12 is good. If it run good AFR at WFO the rest will follow suit with the tune
 
DooZ said:
General ?...would closed loop clean that up if it's truly a problem?
Click to expand...
The closed-loop map could certainly be different from this because they might deem leaner AFR at cruising is ok. That's possible. But 12.0 WO is good and with today's pump gas I wouldn't chance leaning it down. Just because it worked fine with your current pump gas doesn't mean you couldn't get some real s$#t out on trail.
I would wait to see if that apparent "build-up" on the outside of the O2 sensor leads to sensor failure. Meanwhile, send it!
 
T.F. the visual hues of carbon on the side panel and on the O2 sensor led me to be concerned that the plugs would be next.
Which is something I haven't been concerned about since I gave up carburetors.
 
I have some carbon there too. What do plugs look like?
You know you are burning a hydrocarbon, right? LOL
There will be some residue.
 
The lower side panel on my 2019 XTX has white decals and they get badly discolored on exhaust side even with closed loop...I am experimenting with making dark decals to cover the white as we speak...the black does not look as good but it wont yellow as bad.

My black decal on exhaust side

side 1.jpg


OEM Decals on PTO side

side 2.jpg
 
sideshowBob said:
The lower side panel on my 2019 XTX has white decals and they get badly discolored on exhaust side even with closed loop...I am experimenting with making dark decals to cover the white as we speak...the black does not look as good but it wont yellow as bad.

My black decal on exhaust side

View attachment 177526

OEM Decals on PTO side

View attachment 177527
Click to expand...
Looks good Bob, and probably for the best. Thanks for the idea.
 
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