I was tuning my car last week. I corrected my high idle issue, but when I enable o2 feedback the afr jumps all over the place instead of a constant ratio like before. There is a margin of error box, but I don't think that I should need to adjust it. It was set to about 10 percent. Has anyone had this issue before?

Josh

 

Anyone?

 

It might help if you post what you are tuning with.

 

My sig says an AEM 1052. I'll even give you the .cal file...

http://stashbox.org/1009125/ANDREW_2.V1.19.cal

If you see anything else that seems out of the ordinary let me know.

Josh

 

If you would like I can change some things with it and send it back to get it working a little nicer for you.

Also, what O2 sensor are you running and have you calibrated it properly in the AEM software?

The only other thing I would change in your calibration would be the idle ignition timing area.

I would suggest taking a log of your problem with the O2 feedback trims to see exactly what is going on. It isn't a problem to drop the trims down.

You could try +8 and -5 for the max error and see if that helps.

 

I'll make a log tonight and post it later. I have a friend who is tuning it with me. He changed the calibration and I want to see how that goes first. I'll change the max error and see if that helps. Do I have to unhook the sensor to calibrate it properly? What the ems says and the gauge are almost identical. True the gain is only 1.01 but it works.

 

What do you mean by o2 trim table? a screenshot would be nice because I couldn't find it.

Here are the logs and cal file

http://stashbox.org/1009527/AEM%20S2000%20Logs.zip

 

Could it be that the o2 sensor has failed or is failing?