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Old 02-03-2018, 09:31 PM   #1
ConfederateTahoe
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Default Bank 2 Long Term Fuel Trim issue

I have a 99 Tahoe and I am trying to figure out a loss of power and loss of mpg. Bank 1 LTFT about 0 and Bank 2 LTFT approx. -10 and the STFT Bank 1 & 2 were also approx. 0 after days of driving. I measured fuel pressure and my key on engine off was 54psi and idle was 48psi. I then let it sit to see if it bled down and it did about 1 psi per minute. I figured it was the fuel pressure regulator. I changed it, cleared the ECU and now I have the following screenshots. I haven't been able to check fuel pressure, gauge is at work.

Apparently didn't fix it and I would appreciate any input. BTW, the last screenshot is after 3 minutes at 2000rpm.

Thanks in advance,
Jeff
Attached Images
File Type: jpg 2018-02-03 1Startup cold_.jpg (209.4 KB, 2 views)
File Type: jpg 2018-02-03 2lt start changing.jpg (212.5 KB, 2 views)
File Type: jpg 2018-02-03 3warmed up.jpg (210.6 KB, 3 views)
File Type: jpg 2018-02-03 4after 3 min.jpg (204.8 KB, 4 views)
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