My ES runs consistently a 15% LTFT on both banks B1 and B2, that is within the 20% trigger point for fuel trims according to Lexus (at least for generation 3), but a little high to me. It has no issues at all (maybe the gas mileage in city driving could be better, but that's a controversial subject). So.. ., guys, please chime in and tell me your numbers.

 

The LTFT 's on my Toyota Camry are 7% on Bank1 and 13% on Bank2.
But it seems that yours is on the high side . . . approaching 20%. This means that you have a "lean" condition. This means that you have too much oxygen in the air/gas mixture and the computer is trying to compensate by adding gas . . . and adding gas . . . and adding gas.

It might mean that your oxygen sensors are starting to show their age and not performing that well.
If they can't actually determine the air/fuel mixture by analysing the amount of oxygen in the exhaust, they could be telling the computer to keep adding gas.

Or you might have a vacuum leak.

I am curiouis as to what LTFT's other have.

 

[QUOTE=coffee4000;8237462]The LTFT 's on my Toyota Camry are 7% on Bank1 and 13% on Bank2.
But it seems that yours is on the high side . . . approaching 20%. This means that you have a "lean" condition. This means that you have too much oxygen in the air/gas mixture and the computer is trying to compensate by adding gas . . . and adding gas . . . and adding gas.

It might mean that your oxygen sensors are starting to show their age and not performing that well.
If they can't actually determine the air/fuel mixture by analysing the amount of oxygen in the exhaust, they could be telling the computer to keep adding gas.

Or you might have a vacuum leak.

I am curiouis as to what LTFT's other have.[/QUOTE

Thanks for the reply. I think I might have a very small vacuum leak because the LTFT's of both banks drop to about 4% in less than a minute under load/acceleration. It puzzles me.

 

Now I wanna know what my fuel trim numbers are

 

And so do we I suggest you to connect the scanner to the OBD port and monitor the LTFT numbers while driving, especially under load and heavy acceleration, but BE CAUTIOUS: do it only on a traffic-free road!

 

Finally got a chance to do that, except I never went to heavy acceleration. Chasing a bad odor on cold starts. Check it out.

https://www.clublexus.com/forums/es3...bad-smell.html

 

My LTFT on both banks is 1% That could mainly be due to how under used my engine was prior to buying it as i'm just nearly at 54k.