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Backfiring Issue and Power Loss?

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Old Jun 24, 2024 | 01:47 PM
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That's what my Autel Maxi Sys tells me, when revving the truck the STFT goes to 1 - (-1) and LTFT -5 - (-11) and then they slowly return to the -30's
 
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Old Jun 24, 2024 | 01:48 PM
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How old/what brand are your O2 sensors???
 
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Old Jun 24, 2024 | 01:50 PM
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Originally Posted by HeyYou
How old/what brand are your O2 sensors???
Upstream O2 NTK less than 1.5 months
Downstream O2 NTK 9 Months
 
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Old Jun 24, 2024 | 01:52 PM
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Hhhhhmmmm..... Were you having the same problem before changing them? Did the problem change at all when you replaced the upstream?

It's pulling a lot of fuel, and I wouldn't be surprised if the backfiring was due to running too lean....
 
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Old Jun 24, 2024 | 01:54 PM
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Originally Posted by HeyYou
Hhhhhmmmm..... Were you having the same problem before changing them? Did the problem change at all when you replaced the upstream?

It's pulling a lot of fuel, and I wouldn't be surprised if the backfiring was due to running too lean....
Yes, I've been having the backfiring issue for a while
 
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Old Jun 24, 2024 | 01:59 PM
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Have you tested your cat? I could see it restricting flow the hotter it gets.....
 
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Old Jun 24, 2024 | 02:01 PM
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Catalytic Converter is hollow
 
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Old Jun 24, 2024 | 02:07 PM
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Originally Posted by RedSparky
Catalytic Converter is hollow
Probably not plugged up then eh?

Can you do data logging? I would love to see what the various sensor do at steady-state cruise for 10 minutes or so.... preferably from standing/slow start.
 
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Old Jun 24, 2024 | 02:33 PM
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The Autel is updating and I have no idea how long this will take, as soon as it's up and running again I'll get that drive logged. I've also gotta change the control arms before I can drive it to the alignment place, but it should not be a problem!
 
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Old Jun 24, 2024 | 03:49 PM
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Famous last words.

 
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