Okay, I tried locking my BLM but what do you guys do to the INT? I figured I would just narrow it down but I haven't heard of anybody else doing this. Also, when cruising around with BLM locked should I be tuning with the O2 sensor at 450mv or should I be looking to run a little richer all the time like 600mv?

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, Jon (350 TBI!)
91 Red My website

 

From my understanding, you're supposed to tune with INT - but I could very well be wrong. I'm still unsure myself.

Anybody?

Ken

 

Yep exaclty, the idea is to tune by the INT. But keep in mind, it takes time for the BLM and/or the INT to stablize in a certain field.


Brendan

 

You lock the BLM so you can narrow the INT. With the BLM locked it can only correct with the INT. So you have to watch what the INT does and add/subtract fuel but in a smaller value than when you changed it to correct the BLM. The o2 will always cross over when in closed loop. If it doesn't the ecm will come out of CL. The value of 450mv is an average, not a constant. In closed loop it adds fuel to go over 450 and takes out fuel to go under. This is happening many times a second so if you average it out it ends up being 450.