Thread: tune question

Anyone ever ran across an issue with the ltft's going all over the place even after tuning the maf in close? I can hit the same cell and maf frequency numerous times and they never hit the same value each time. For example I'll hit the 5000 freq and one time it will be +7, next time it will be -6. And yes I have dialed in the maf tables close to 0

This is making the final tuning a super big chore as it's never consistent.

Says he's got a N* in his sig, might be a cause there.

I have read that thread but I'm referring to my ltft's at non-boost levels. It's being a pain getting the trims to come in line to 0

Yes, I've got a N* and a different maf then anyone is probably running too.

First things first are you reseting yourtrims each time you make your changes? Are you multiplying percent half each time you make your changes?

Yes I'm resetting the trims each time and give it sufficient time to relearn. My changes are made though table modifier program used with DHP and some manual changes but small. The ltft's are just being difficult to keep in line and seem to be tqwice as bad when it's below 30*. I've noticed the past few days too that my O2 reading seem to be lazy, but not throwing a code

Can't help you with dhp sorry. However usually when 02's start oscillating really slow at any engine temp it indicates a dying sensor which I'll make tuning with trims a nightmere.

I did just replace the O2 with a new Delphi when I did the header install. I'm thinking I might be having a issue with the O2 not holding the heat in even though it's heated because of the headers pulling the heat out too quick. I just changed my t-stat and went back to 195 and it got a tad better but still not great. Maybe I should heat wrap the O2??