PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

All LTFTs the same!!

Old May 3, 2008 | 08:52 PM
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Default All LTFTs the same!!

Newbie at tuning.... working on a VE table, not finished, but....

All LTFT values at 0-15 are 10.01. Positive values indicating enrichment to provide stoich.

But, why all the same????

Shouldn't these values be different for the different map/rpm sectioning. I've looked at an LTFT Map log and they have variation for the different rpm/map values at a much higher resolution.
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Old May 3, 2008 | 10:06 PM
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If you are in open loop, which you must be to tune your VE, and you didn't reset your fuel trims when you first started logging, the previously "learned" LTFTs will still be active but not updating. Unfortunately for you, that means that your VE tuning is going to be skewed badly by their effect. It's ok, I have done it myself and I am sure that many others have as well. It's one of those things that gets you once, and you always remember to reset them up front thereafter.
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Old May 3, 2008 | 10:53 PM
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Not there yet. I have not unplugged the Maf.

Is this indicative of Maf sensor problems, or maybe something else?? Thats what I'd like to know before I begin an Autotune with existing problems.
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