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Thread: Need some help
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06-24-2015, 05:59 PM #1
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Need some help
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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06-24-2015, 07:46 PM #2
"The Rock"
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Have u scanned the burb?
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1996 Camaro Z28: RIP 09/25/2016
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06-24-2015, 08:35 PM #3
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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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06-25-2015, 04:44 PM #4
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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.
1995 Formy M6 T-top LS1 WS6 air box w/LG G2 lid, LE 226/230 cam, cleaned up stock heads, 1.6 RR's, SLP pp, SPEC stage 3+ disc, LPP longtubes, Magnaflow, t/a cover, 3.73's, J&M LCA's, UMI 3pt SFC's. 12.8 @ 110 on a 2.00 60'
3 days after going back together untuned.
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06-26-2015, 12:39 PM #5
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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.
Turbo 93 Z28
LSX 93 RX7
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06-26-2015, 12:57 PM #6
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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.
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06-26-2015, 01:31 PM #7
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I'd check for a vacuum leak also.
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06-28-2015, 07:37 AM #8
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Fixed replaced the maf and upstream 02's
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06-28-2015, 09:34 PM #9
"The Rock"
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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.
Originally Posted by jay97lt1
LTXtech.com is my Drug...
Our BIG MOMENT @ the 2012 LTXshootout
http://www.facebook.com/photo.php?v=521756391174175
1996 Camaro Z28: RIP 09/25/2016
1994 Trans Am GT: SOLD 05/2017
1985/1996GS clone: SOLD
1996 Impala SS H/C, LT, with true dual exhaust, 4.10s, lowered, with CPT trans, many cosmetic mods, and a whole lot more to come...
2002 Caddilac EscaladeL CAI, lowered, 6.0 , AWD..
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