GMT 900 Trucks General Discussion 2007 - 2013 Trucks | General Discussion

wierd fuel trim readings????

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Old Jun 7, 2012 | 11:42 PM
  #1  
jik294's Avatar
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Default wierd fuel trim readings????

ok here are the readings

B1 LTFT: -3.1%
B2 LTFT: +1.6%

O2 B1 S2T: 99.21%
O2 B2 S2T: 99.21%

Fuel ST HEX: 202
Fuel presure: 0 (this is with it running)

now I took off my exhaust from the y-pipe (split the welds almost entirely around the housing on the magnaflow muffler that was on it) would this be the cause of my readings?

i'm a little concerned that i'm not seeing any fuel pressure readings while running.

i got these with my superchips flasher

idk maybe i'm stupid but it doesn't seem right to me.
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Old Jun 7, 2012 | 11:54 PM
  #2  
2007chevy5.3l's Avatar
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So your running it open Y? If so it wont cause your O2s to read incorrectly.

How many miles are on the truck? It could be a lazy O2 or the O2 is going/gone out. Try switching the O2s and see if the problem goes to the other side.

Another thing is a exhaust leak up stream of the sensor could cause a issue
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