avalonandl
Full Access Member
Wes, is your engine modified? You need to see a tuner to cut back on the fuel. Your dumping fuel into your engine. Check a plug for color.
What did you do to your NNBS GMT900 Tahoe/Yukon Today?
- Thread starter phattyford
- Start date
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no mods other than a cai and ls7 throttle body, how could it be dumping fuel the short terms are -2/0 the long terms are 7, checked a couple plugs a couple weeks ago they looked fine, i didnt check them all, would a leak down test show anything?
ibfreeman88
Full Access Member
I'm still at 10psi currently. I did swap turbos from the original setup though so it makes power all through the rpm range instead of just up top. These LSA injectors are pretty high in duty cycle at full boost and 5-6k rpm's. As far as pwr/trq I honestly couldn't tell you it's been remote tuned since my first tuning debacle. I may throw on a dyno one day if there's a local dyno day just for giggles.
avalonandl
Full Access Member
Wes, is your engine modified? You need to see a tuner to cut back on the fuel. Your dumping fuel into your engine. Check a plug for color.
avalonandl
Full Access Member
I think the MAF thinks your flowing a lot more air.
You should be pig rich....
A CAI can do that. How long has it been installed?
You should be pig rich....
A CAI can do that. How long has it been installed?
avalonandl
Full Access Member
Got an email, my $ 24 rebate for AC plugs is on its way...
pretty much since I have owned the truck about 2 1/2 years
I have a autocal I bought i just haven't purchased a tune yet
swathdiver
Full Access Member
Late to the party, but I wonder what Wes, took out the cat? Sticky fuel injector? You can turn them on and off and check your fuel pump trims too. Your LTFTs @ 7, if they stay there for a long time are off. What's your alcohol content? If that number is off, you can reset the Fuel Trims and Fuel Composition and start her over again.
had 2 new magnaflows put on it today, the last couple times I looked the long terms were at 7 both times, it's weird that as soon as the p0430 code cropped up the mileage went up from 8 to 9.5, I can take a look at it some more tomorrow with the tech2
swathdiver
Full Access Member
If I remember right, a positive number is lean and that would explain why the cats are so hot. They heat up fast, especially when accelerating but cool down over a long run. For example, let's you accelerate onto the highway. The temps maybe get up to 1500 or so and then take 30 minutes to drop 200-300 degrees while maintaining that speed.
Since the cats are new, it is not unusual for them to throw a code within the first 100 miles, part of break-in period. Clear it and keep on driving.
gooffeyguy
Tom
My last two fill-ups have been with 93 octane (due to low prices) and my alcohol % on this current tank is 0.0
Is it normal to have NO alcohol content in regular gas?
I am getting better gas mileage than usual though,... Lol
2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18
avalonandl
Full Access Member
Wes, why do you have an LS7 TB on your engine...?
Well, it's nearing time to purchase my shorty headers. I'm down to the following choices, and would like any opinions you guys have. I know @kbuskill has the JBAs, but they're the costliest of the bunch. Gibsons are on sale, and that's where I'm leaning right now. Any input would be great.
Mickey_7106
Full Access Member
Other than making the engine bay look pretty and noisier, those shorties won't do anything for you..
Just because , it's never been a problem
I don't think the fuel trims are stuck, I think what I was seeing was the data display showing 7 until it starts receiving data, the long terms are around 5 which should be good as far I am able to determine so far
Here is some intake data I have no clue on this stuff but one shot is at idle and the next is at 50mph
Just because , it's never been a problem
I guess the real reason is eventually I would like to upgrade stuff a bit, maybe port the intake and install a better cam, the engine is still under warranty till March of next year so I haven't really messed with it yet and I don't have a *** of cash to throw at it all at once so I have to do it a little at a time
Tonyrodz
Resident Resident
The throttle body doesn't void the warranty?
