[bfitz241]

I had to send my LM 2 back to Innovate because it started reading inconsistently[ channel 2 was all over, from 7 : 1 to 64 : 1 AFR] It started that after I updated the firmware.

Anyway, I got it back, it calibrates fine [20.9 both channels].

My problem/question:

At idle it's reading 16:1, same at light throttle cruise.
When I tried to richen the idle screws, the engine started running worse and the exhaust started to burn my eyes.

Has anyone seen an LM 2 read incorrectly or should I look at the ignition?

it idles at 800, plugs are a little gray, but not terminal. I'm not driving it except around the block until I get the basic tune straight

It is very frustrating when you can't trust your equipment.

351C Ford 10:1
Solid flat tappet, 236@.050
Edelbrock air gap, holley 3310-1
14* initial
Thanks

[Sinister]

Innovate has a forum at their website that can be helpful. It seems to be down until September 1st though. Those LM-2's seem to have a rep for being kind of fickle.

[bfitz241]

yeah, I knew their site was down...kinda hoping someone else would have an opinion ...always helps to have input. I plan to try again this weekend and see how it goes.
Thanks

[Overdriv]

It sounds like you might be getting air infiltration into the exhaust stream. That will make the AFR run lean.

You did recalibrate with the sensor removed from the pipe, right?

[bentwings]

Definitely make sure your exhaust is tight. I use solid copper gaskets everywhere and double nut the collectors. Even a slight air leak will affect the readings.

I also let the 02 sensor warm up before starting. Mine goes to 22.4 when ready when the motor is cold.

Once in a great while mine will lock at 15.1. I just stop and shut the motor off and restart. Usually this happens if I don't let it warm up before the first start of the day.