mindreaper

iTrader: (1)

I've just installed an LC-1 wideband and a Trick Performance V-gauge.

The LC-1 seems to have calibrated fine, but the AFR I get on the gauge is very uneven, jumping erratically and frantically from about 13 to 15.

What do you think this could be? Maybe this could be a ground problem because I grounded the V-gauge at the back of the head together with the LC-1... and maybe I should have grounded the gauge apart? What do you guys think of this?

jimmyblue

iTrader: (11)

This is kind of natural for closed loop, the mixture is forced to swing
because the narrowbands need switching.

mindreaper

iTrader: (1)

Thanks but I'm new to all that PCM stuff and I don't understand what you mean by "the narrowbands need switching" (I know what the narrowbands are, but why do you mean by "switching" them?). And how can I get more accurate AFR readings?

Unreal

In closed loop the AFR will swing around from 13-15. It is completely normal.

robbyredneck

iTrader: (1)

i think what jimmy's saying is the pcm is trimming fuel up and down around stoich and the narrowbands are switching voltages reallly fast giving the pcm feedback. its never really static in closed loop

mindreaper

iTrader: (1)

Thanks for the explanation guys!