MSefi.com read only forum (Jan.15,2018)

Thought this one was worth a special mention. Ever since I switched to the wideband feedback, a noisy signal was ever present. If you see my "LC1 gone cazy" and "Is this much AFR noise normal" posts. As I've posted, some improvement was achieved by powering the LC1 from a dedicated circuit, rather than the ignition/pump feed. I decided to go a bit further, and purchased a noise filter disigned for filtering noise from car radio's or CB's. That was the eureka moment. Went for a drive and took a log. Wow! Nice smooth feedback without any lean spikes. The oly time I get some (low level) noise is when at idle and the thermo fan kicks in. Makes sense. Decided to do another couple of VEAL runs, and the results are far better than before, and I thought it was good then. Anyhow, I hope this helps others, as I've read a lot about unstable or noisy WB feedback, perhaps even some LC1's were maybe unjustly vilified as un-reliable, where noise could have been the culprit.

Any reason why you initially used the ignition/pump circuit rather than the MS one (assuming they are different)? And did you try another LS1? It possible yours has faulty supply filtering. And how is it grounded?

Hi Trakkies.
The reason for using the pump/ ignition feed was so the unit was powered only on a running motor, and would not sit with the heater active when the ignition is on with no running. (my car does not have an accessory position on the ignition switch- useful when stationary and listening to the radio, eg. Drive in movies) As for trying another unit, I figure buying another one a complicated "fault-finding" exercise, as I would have to order another from the US (cost and delay), as I'm not aware of an antipodean supplier.