Proform 850 dialing it in closer

Hysteric said

There is something seriously amiss here. There is no way you should be getting those large swings in AFRS especially at idle. Do you have another known good carb to put on to see if it fixes this anomaly?

If it were mine I would baseline the carb with what a similar holley would have both in the jetting and air bleeds and stock holley emulsion. Can you provide a log with just idle and transfer fueling before the primaries begin to flow?

Click to expand...

:thumbsup: it has open header and the o2 is 11 inch before the end of the exhaust.
Only thing readable or accurate is at full throttle.

If you go back to post 7 where i was using a gopro to read the meter you will see even higher numbers at idle.
only had 2 inch between the sensor and the end of the exhaust.

I have thought about adding a muffler and a down pipe.........but that cost money. there for idle and transfer slot reading......well it's not capable of that right now.