FastG wrote:
You did not say if it was a harness from a V8, V6 or I4 Mustang. Assuming it a I4, I would think the second O2 sensor is for a post Cat sensor, so the ECU can tell if the cat is running well. If your V6 or V8 there will be one for each cat. If the Megasquirt can use both it would be useful.
Graham
Sorry;
Info on my build Log, but "my" build log appears a someone´s else due to a change in user name.
It is a 1995 5.0 V8 Mustang.
The second O2 Sensor would be on the other side collector
rx7locost wrote:
It is your choice as to what to do. If you run closed loop, then you will need the upstream one. at a minimum. But you don't have to run closed loop. You can run open loop in which case, none are required. I believe that you are in Mex? I don't know what your requirements are. Maybe you won't even need to run a cat converter. If so, then there is your answer. I don't know if the recent MS firmware now has the option to check the downstream sensor and output or log the result. (probably does)
It has been a while since I dabbled with MS. If you decide to run both, and run a wideband, you will need a wideband controller and just feed the analog output to the MS. I can't imagine needing a wideband downstream of the cat ust to check the cat's . A narrow band should do just fine I think.
Well, I´m inclining myself to keep both available sensors wired in, but only one connected to the Megasquirt.
Lter on I may consider fitting a Wideband.
As per Mexico requirements, there´s no regulations regarding self build cars, so I can pretty much run whatever I want.
Thanks all for your help.
Angel Acevedo