Help! Strange A/F behavior
 

Ever since Ive had this gauge the meter has set almost exactly between rich and lean during highway cruising. Today, everytime I hit a bump on the highway (my D2s are set pretty stiff right now) the meter would jump all the way down to lean. Ive never seen it do this before. (This happened regardless of whether or not I was on the throttle.) Any ideas why this would happen when hitting bumps? I know the mixture is supposed to lean out during cruising/decelerating but this seemed drastic compared to anything its done before. Thanks guys.

I doubt it has something to do with the true A/F of the car...
There's probably a short somewhere...
Plus, that's a narrow band A/F so it's not that accurate to begin with...
I would trace all the wires and see if you can't find the culprit that way...

Mike

thanks mike, maybe we can check it next Saturday or something. That sounds very possible.

when did you install this guage?
Where is it reading the A/F?

I put it in last summer; its spliced into the front O2 sensor.

its better reading a/f off a wideband instead of how you have it set up, how you have it, the a/f would just bounce up n down, its not really accurate.

^^^ im assuming you need a wideband specific gauge then, am i correct?

wideband would get a much better a/f reading.

The guage just reads the a/f signal the o2 is reading, so your A/F shouldnt be bouncing all over the place just. If you didnt have an A/F meter you wouldnt have even noticed.

For the moment i cant think what would cause your mixture to change so much. I'm guessing maybe the o2 is on its way out.

Or try connecting you Guage the o2 on the other bank, see if the mixture changes at a bump

maybe the o2 sensor isnt fully tighned, and shakes a bit on bumps.