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Need a little help with ltft's

Rlugo87

Rlugo87

New member
So from what I gather -ltft is Rich and +ltft is lean, I was on a 300 mile round trip tonight in my 01 gtp (dhp pcm, fwi) and I noticed my ltft's while cruising are around -14.8 to -15.1, at idle they are -18. So I'm running Rich right? What can I do to get these numbers back into an acceptable range? Car seems to run fine no kr, the car does have a bad vent/evap, no code but I have hard starts after a fill up. Thanks in advance guys.

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Remove 2-4% at the time from the MAF curve below 5-6,000hz to see if the trims move more positive. Just take that whole section and remove a small amount, smooth the curve and flash the tune. See what it does.

Just a FYI the computer is correcting for the fueling so technically it's not running rich but it is.
 
I would try fixing the evap. Your trims should not be that far off. That shows a good chance of a mechanical problem.
 
GTPpower said:
I would try fixing the evap. Your trims should not be that far off. That shows a good chance of a mechanical problem.
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Ordered the part today, what's odd is it used to stay around -5 and just move twords 0 depending on how far I was in the gas.

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I have no evap codes, just hard to start anytime I put gas in, the car starts perfect any other time but after every fill up it takes cranking and revving to get her going. My research tells me it's an evap problem...

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why i said to cap it off from the tb. that eliminates it from the equation. if it dont pull this act with it capped off. well then you found the issue for sure.
 
Scottydoggs said:
why i said to cap it off from the tb. that eliminates it from the equation. if it dont pull this act with it capped off. well then you found the issue for sure.
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Will give that a try, I have a box of vacuum caps somewhere I'll dig them up.

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