rtracy

I found something interesting in one of my datalogs today. I have split LTerm and STerm counts (124Lt and 154Rt LTerm counts)
(110Lt and 150Rt STerm counts)

Is this normal?

Mo_Bandy

Yes it is possible to have split fuel trims generally you would want to be just to where you are adding a touch of fuel and the ECM pulling it... 115 to 141 are considered normal. 128 is considered the center of the range not adding nor taking fuel away. Long term are the more important as it gives you the long term status of what the ECM is doing the Sterms will change the Lterm if there is a +/- 10% difference in what fuel is needed .

When you run wide open throttle take a look and see where they are setting in closed loop cruising around the ECM will pretty much handle things, unless you have a programmer and are working on getting them dialed in a little closer...
there are tons of archived posts on this...

Mo

rtracy

Thanks, Mo

Morley

Not only are your long term and short terms split, you have a pretty hefty split between laft and right.
What you want to see are Long terms in the 125-134 range with short terms that prety well match that. This is during a normal closed loop cruise.
Tour RH log and short terms are quite lean, considering that they max out at 160. And your Left short term is 110 (rich) with 108 being the max rich possible.
If it were me I'd start off doing an injector balance check to eliminate the possiblilty of bad injectors, then look into how the O2's are reacting.

rtracy

The injectors are new AC Delco. How do I do a injector balance check?

Morley

http://www.mightyautoparts.com/pdf/articles/otl1298.pdf

rtracy

Thanks for the link Morley. I'll check it out.