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jay97lt1
06-24-2015, 05:59 PM
I know this ain't LT1 related but I need some advice. My wife has a 05 burban LT 5.3 flex fuel a few weeks ago she started complaining that it was losing power. I would drive it ran normal last week I finally got it to act up now it won't get out of it's own way. I have delated the converters, fuel pressure holding at 60 psi, changed plugs, wires, motovac fuel injection system. Nothing has helped. Bank 1 1 3 5 and 7 plugs we're all failed out bank 2 plugs looked normal. It only has a p0300 code. Any help or recommendation would be greatly appreciated. Thanks Jason.

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popo8
06-24-2015, 07:46 PM
Have u scanned the burb?

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jay97lt1
06-24-2015, 08:35 PM
Yea it's just showing missfire on # 1,3,5,7 no missfire on 2,4,6,8 #1 is the worst replaced #1 coilno difference

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Bowtie4Life
06-25-2015, 04:44 PM
dumb question, but did you check the fuses? Also, if it's just the one side, check the harness connector to make sure it didn't come loose somehow. Each coil bank has a main connector connecting it to the harness, big white connector towards the top centerish of the coil packs/valve covers.
milehighz28
06-26-2015, 12:39 PM
I have a buddy having the same problem on a Yukon except his is bank two. He has replaced the ECM, coils, plugs and a few other things to no avail. I think he replaced the crank and cam sensors too. I wish I had some advice for this, but I definitely want to follow to see what you find. I will let you know if he figures his out.
cheese
06-26-2015, 12:57 PM
O2 sensors. Monitor the data from the o2 sensors and compare the data. Ive had a few that would foul the plugs and set a po300/ the ecm is trying to correct the bad reading from the o2 sensor by dumping fuel.
superspirit
06-26-2015, 01:31 PM
I'd check for a vacuum leak also.
jay97lt1
06-28-2015, 07:37 AM
Fixed replaced the maf and upstream 02's

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popo8
06-28-2015, 09:34 PM
Fixed replaced the maf and upstream 02's

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Good deal. Thanku for posting the fix. I hate when there is a problem thread... people help... but then it ends that way.... no resolution post.

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