Long Term Fuel Trim Question
12-29-2008, 09:16 PM
#1
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Long Term Fuel Trim Question Hey all,
So I've been going back and forth via email with a rep at autotap because I'm having issues logging my bank 2 LTFTs on my '96. The car goes into closed loop and the front O2s are switching properly, but bank 2 LTFT bogusly reads 100% for a while, then slowly starts counting up from 1% until I kill it.
Now I thought I was on top of this, but to hear this from an "expert" has me second guessing myself. The autotap rep guy seems to think my lack of rear O2 sensors is the problem or something....here's what he said, copied and pasted from an email:
Someone reassure me that he is wrong....I mean...my bank 1 LTFT is working just fine. Has anyone else had this problem with autotap?
So I've been going back and forth via email with a rep at autotap because I'm having issues logging my bank 2 LTFTs on my '96. The car goes into closed loop and the front O2s are switching properly, but bank 2 LTFT bogusly reads 100% for a while, then slowly starts counting up from 1% until I kill it.
Now I thought I was on top of this, but to hear this from an "expert" has me second guessing myself. The autotap rep guy seems to think my lack of rear O2 sensors is the problem or something....here's what he said, copied and pasted from an email:
In a stock system, the post-cat O2s provide long term fuel trim. If you removed the cats, what happened to the wires for the post-cat sensors?
01-03-2009, 05:26 PM
#3
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correct... it's the front 2 (sensor 1's) that are used for fuel trims...
the rears are only there to tell if the cat's are working properly... which is why, when people do exhaust work and remove their CAT's, the rear O2 sensors (sensor 2's) can be removed or their DTC's disabled. they are not needed for anything else other than the CAT's...
the rears are only there to tell if the cat's are working properly... which is why, when people do exhaust work and remove their CAT's, the rear O2 sensors (sensor 2's) can be removed or their DTC's disabled. they are not needed for anything else other than the CAT's...
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06MonteSS / DiabLew Tune
2014 Camaro 2SS/RS - LS3, 6-speed manual, short-throw performance shifter, NPP dual-mode performance exhaust, 1LE front splitter, ZL1 rockers, Z28 Rear Spoiler, all paint-matched Red Rock Metallic, BMR strut tower brace, Cold Air Inductions cold air intake, Apex Motorsports, Inc. catch-can, Custom DiabLew Tune
www.diablewtune.com -- www.diablocustomtune.com -- www.diablocustomtunegm.com
01-04-2009, 08:35 PM
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...that's what I've been trying to explain to the rep at Autotap. He has me jumping through hoops trying crap rather than looking at the bogus log files I have been sending him because I guess he can't accept the fact that maybe something is wrong with the software or cable firmware. It's really frustrating.