2003 Yukon SLT scanner live status problems

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Wes
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Yesterday I hooked up my scanner ( cheapo) and used the live data. At Idle 530 rpms my B1 LTT 12.5 B1 STT +2.3 - 0 B2 STT 25 pegged B2 LTT +23.4 - +25.8
At 2500 and 3500 rpms B1 LTT 25 pegged B1 STT +1.6 - + 8.6 B2 LTT 25 pegged B2 STT +45 - +50

This morning I did the fuel pressure 40 psi key on not started, 59 psi at idle , 57 psi at 2500 and 3500.

I'm wondering if the injectors were the correct ones?
 

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Yesterday I hooked up my scanner ( cheapo) and used the live data. At Idle 530 rpms my B1 LTT 12.5 B1 STT +2.3 - 0 B2 STT 25 pegged B2 LTT +23.4 - +25.8
At 2500 and 3500 rpms B1 LTT 25 pegged B1 STT +1.6 - + 8.6 B2 LTT 25 pegged B2 STT +45 - +50

This morning I did the fuel pressure 40 psi key on not started, 59 psi at idle , 57 psi at 2500 and 3500.

I'm wondering if the injectors were the correct ones?

40's not enough for starters. V8 spec is 55 to 62 psi; if it's a Flex Fuel engine (VIN Z) it's a little lower, 48-54 psi. If you cycle the key a few times does it get higher? I'm also wondering if when doing the KOEO test how steady the fuel pressure remains. It'll probably leak down a little over several minutes, but how much and how long does it take?
 
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zmann96

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40's not enough for starters. V8 spec is 55 to 62 psi; if it's a Flex Fuel engine (VIN Z) it's a little lower, 48-54 psi. If you cycle the key a few times does it get higher? I'm also wondering if, when doing the KOEO test, how steady the fuel pressure remains. It'll probably leak down a little over several minutes, but how much and how long does it take?
I can try that in the morning. Thanks appreciate your help
 
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zmann96

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40's not enough for starters. V8 spec is 55 to 62 psi; if it's a Flex Fuel engine (VIN Z) it's a little lower, 48-54 psi. If you cycle the key a few times does it get higher? I'm also wondering if when doing the KOEO test how steady the fuel pressure remains. It'll probably leak down a little over several minutes, but how much and how long does it take?
had 40ps key on, key on and off 3 times 42.5psi stayed there for 2 minutes no drop.
 
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zmann96

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40's not enough for starters. V8 spec is 55 to 62 psi; if it's a Flex Fuel engine (VIN Z) it's a little lower, 48-54 psi. If you cycle the key a few times does it get higher? I'm also wondering if when doing the KOEO test how steady the fuel pressure remains. It'll probably leak down a little over several minutes, but how much and how long does it take?
Down to 34psi in 18 minutes 6psi loss
 
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zmann96

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40's not enough for starters. V8 spec is 55 to 62 psi; if it's a Flex Fuel engine (VIN Z) it's a little lower, 48-54 psi. If you cycle the key a few times does it get higher? I'm also wondering if when doing the KOEO test how steady the fuel pressure remains. It'll probably leak down a little over several minutes, but how much and how long does it take?
down to 28psi after 1hr 15min. loss of 12psi.
 
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zmann96

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40's not enough for starters. V8 spec is 55 to 62 psi; if it's a Flex Fuel engine (VIN Z) it's a little lower, 48-54 psi. If you cycle the key a few times does it get higher? I'm also wondering if when doing the KOEO test how steady the fuel pressure remains. It'll probably leak down a little over several minutes, but how much and how long does it take?
16 psi after 9 hrs loss of 24 psi is this normal?
 

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Doesn't seem abnormal to me, but I'm too familiar with absolute values. Hopefully someone more knowledgeable will chime in.
 
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zmann96

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did a compression test this morning Bank 1 - hole 1 = 165, hole 3 = 170, hole 5 = 166, hole 7= 164
Bank 2 hole 2 = 170, hole 4 = 178, hole 6 = 170, hole 8 = 168. I was really surprised all were that good, now I have no idea what my problem is. good fuel pressure, good compression, no vacuum leaks, new O2 sensors. just fuel trims that are out of wack.
 

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