I'm sure my van burning to too gas

I'm sure my van burning to too gas

Postby grandamle91 [OP] » April 24th 2013, 1:29am

Can someone look at the csv file and see if it looks right. My long fuel is always at 25% and my short fuel trim bounces from 0 to 50% :ty:
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trackLog-2013-Apr-23_19-14-58.csv
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-Evan
MONSTRO 97 Chevy Astro 346k
LQ9
4L80E
NP262
Full float 14 bolt 3.73
Tuned for e85
Headers 4in Exhaust
3500 spindles and hubs
285\85-16
98 Pontiac Grand Prix GTP 253k
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Re: I'm sure my van burning to too gas

Postby redfury » April 25th 2013, 3:44am

I can't look at the file since I don't have the program to open it, but based on what you've written, LTFT numbers like that indicate a vacuum leak or a lack of fuel ( lean burn ) which is causing the injector pulse width to be lengthened, which will drive down fuel mileage.

STFT numbers should hover above and below 0 if the LTFT is stabilized by the computer as it has figured out how much fuel to add for each cell in the fuel trim equation. Bouncing around like that tells me you may have something going on with your MAF sensor. Try cleaning it with a MAF friendly cleaner ( CFC brand is what I use ) and check your fuel trim readings. The short term should stabilize if it was dirty and the long term should react as well. If it's a dirty MAF, then you are likely to see the STFT numbers go negative until the LTFT numbers find their new happy place. You can also disconnect the battery and touch the cables together or cycle the key a few times to discharge the capacitive memory in the computer to put it back into "relearn"/factory fuel trim numbers. If you have a factory service manual, it has a section that tells you what all the baseline sensor readings should be.
A temporary fix usually becomes a permanent solution, therefore it does not exist.
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Re: I'm sure my van burning to too gas

Postby grandamle91 [OP] » April 30th 2013, 4:37am

When it turned out to be the iac
-Evan
MONSTRO 97 Chevy Astro 346k
LQ9
4L80E
NP262
Full float 14 bolt 3.73
Tuned for e85
Headers 4in Exhaust
3500 spindles and hubs
285\85-16
98 Pontiac Grand Prix GTP 253k
***Removed Dead Image***
Original Poster [OP]
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grandamle91
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Re: I'm sure my van burning to too gas

Postby redfury » April 30th 2013, 8:25am

grandamle91 wrote:When it turned out to be the iac


It turned out to be the IAC....does that mean that all of your fuel trim numbers are back to around zero, or did the bouncing STFT stabilize and you still have higher LTFT numbers?
A temporary fix usually becomes a permanent solution, therefore it does not exist.
doghouse removal by me!http://www.youtube.com/watch?v=uIJ0kuROlbU
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Van Model Year: 1998
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Extra Info: LT 5.7L 4wd

Re: I'm sure my van burning to too gas

Postby grandamle91 [OP] » May 1st 2013, 12:14am

the ltft sits around 20-25% stft goes from 10-20%
-Evan
MONSTRO 97 Chevy Astro 346k
LQ9
4L80E
NP262
Full float 14 bolt 3.73
Tuned for e85
Headers 4in Exhaust
3500 spindles and hubs
285\85-16
98 Pontiac Grand Prix GTP 253k
***Removed Dead Image***
Original Poster [OP]
User avatar
grandamle91
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Posts: 1399
Topics: 137
Images: 2
Joined: April 2008
Location: Watertown, SD
Gender: Male
Alias (AKA): Evan
Van Model Year: 1997
Van Make/Model: Chevrolet Astro
Extra Info: LT 6.0 V8 4L80E NP2


 
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