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Scan tool Revealed LTFT +25%

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Old Jul 15, 2009 | 08:27 PM
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Question Scan tool Revealed LTFT +25%

I hooked my '00 T/A into a scan tool because of a lean bank 1 and 2 code and found my LTFT to be +25%. I think my injectors are about maxed with my .623" lift cam, LT headers, LS6 manifold, LID, and P&P TB, but havent got that code in a while, I used to get it once in a while when i took my cutout off, but now its still on even after clearing it. could it be a vacuum leak?
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Old Jul 16, 2009 | 07:44 AM
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could be vacuum or exhaust leak or anything that throws extra oxygen into the exhaust, like an injector not spraying fuel, so the cylinder is just pumping air.
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Old Jul 16, 2009 | 09:15 AM
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Could also just be the cam and long tubes, if the
25% is only at idle and low TPS then O2 sensor
heat issues and shot-through air can make it read
lean.

Maxed injectors will only be revealed at the big
end where O2 sensors are ignored and no trimming
goes on (aside from +LTFT "residue", which is about
where you came from, not where you're at).
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Old Jul 16, 2009 | 12:40 PM
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I just looked at my fp gauge under my hood. KOEO should sit at about 60psi, i turn the key and it went up to 30psi and dropped back to zero in a second. I cranked it up and its at 27 psi!!!! WTF. is it my FP reg. in the tank?
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Old Apr 1, 2010 | 10:29 PM
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find out what the problem was? im havingthe same issue with B! LTFT
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Old Apr 2, 2010 | 01:48 PM
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find out what the problem was? im havingthe same issue with B! LTFT
Bank specific LTFTs are 99% due to a bad o2 sensor on that side. An air leak would cause both banks to be affected, but if it's just one then it'st most likely the o2 sensor.
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