Got a BRC AT90E on the current V8 3.5 disco, running open loop. It's just been for MOT and failed on LPG due to about 7%CO.
Having spent about 2 hours getting my CO meter to work, I concur, it's way high at idle. Petrol CO figures look about right.
Running at 3000 rpm on LPG it was a bit high too, so turned it down to about
1% which should be OK, I reckon, but it's still showing about 7% at idle.Now, on an OMVL I'd now be tweaking the idle settings, but I can't find them on the BRC, if there are any. There's a small-ish brass knurled knob with a hex on it on one side, but undoing it makes no difference to the CO so I don't think that's it. There's also a larger knurled knob at the bottom, which is in a place that leads me to believe it's a drain plug.
So happens I have got an OMVL which I could put on it instead, since I know how to adjust those, but I'd prefer to know how the BRC works. Any ideas?