Hello

I am wondering what the long term fuel trims should be for a Disco 2? Mine is a 99. My readings for Long Term are.

Bank 1 6.3%
Bank 2 7.0%

Short terms seem to jump +/- 5.0% ish

 

Mine are +\- 2%
Last year it would get up to 8% or more when the purge valve was on the fritz

 

I didn't know the purge valve would cause that. Was there any pinging when you had that problem?

Are these numbers you posted for long term?

 

Update.

I reset adaptive learning by disconnecting the battery overnight. I expected my long term fuel trims to start off at 0.0%. Well they reset to +7.0%. I drove a little over 200 miles and now they have settled in at 8.6% for both banks. My short terms pretty much switch back and forth between +/- 3.0% Do these numbers sound good to those in the know?

 

That's what mine is doing: switching anywhere between -3.1% to +3.1%ish
(Both LT & ST similar) and these numbers are strictly highway miles @ 60mph

 

My LTFT's are in the range of +/- 3%

A few weeks prior, my trims were wacky. Swapped out the purge valve which brought trims back within the norm for a motor with 120k miles (+/- 3%).