I was monitoring my truck tonight and realized the long term fuel trim (LFTF) was -18 (+/- 1.5) regularly even once the truck was heated up. Is this how Rovers run or a bad O2 sensor?

Do people usually tune this out? Should I worry about this? It just seems to be wasting fuel if this is how it normally runs.

Thanks!

 

You do not tune out a possible 02 fault. How many miles on the truck, have the 02's ever been replaced and have you compared the readings from Banks 1 and 2?

 

Here's the book on the GEMS computer, explains it in more depth than the basic RAVE. Values should not be "static", they should change. I got almost 17 mpg last week on flat ground with my 97. Fuel economy with a Rover is measured by.....