can your L.T.F.T. closer to 0 give you better fuel econonmy? I mean if you L.T.F.T. are at say 20% and you get them closer to 0 would you see improved fuel econonmy?
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can your L.T.F.T. closer to 0 give you better fuel econonmy? I mean if you L.T.F.T. are at say 20% and you get them closer to 0 would you see improved fuel econonmy?
Are your LTFTs 20%, or is this a hypothetical question?
High LTFTs cause AFR to be whacked.
The easiest way to find out is to log WBO2 and see how BENs are in CL.
For me, BENs are between .99 to 1.02 with LTFTs averaging -2%,
being a little lean from idle to 1200 RPM.
LTFTs that high could be an intake or exhaust leak.
just check for an intake leak and it turned out negative, there is not a intake leak. The truck runs fine no hesatation or stalling just the ltft are around 20% here is a scan i ran
Any mods to the truck?
I don't know if it is normal for a truck to have high LTFTs but
it would go against common lore of having LTFTs 0% or slightly negative.
I had just worked on a 2000 Camaro that had those type of LTFT's and it was an exhaust leak that looked very small but caused the trims to be out of wack. An exhaust leak is not as easy to find sometimes.
98 tigershark
That could affect the LTFT and STFT as they are both OBDII issues.
I have heard of that before. Do you know what to do to fix the problem. It could be a bad sensor or even a bad fuel cap. It is hard to tell but again I have heard of this effecting the fuel trims but have not seen this personally.
Regards,
98 tigerhark
have you ever heard of this decreasing your fuel economy? Or does this not affect fuel economy? I beleive it is for fuel vapars, but i really can't see you loosing any m.p.g from your evap system?? No i don't really know the problem yet, but i am trying to figure it out.