Oxygen sensor latency?

**sgtpoliteness** · 02-22-2014

I've done some searching and haven't come up with anything concrete. I've got a 16197427 $0D junkyard setup that I'm putting the finishing tune touches on. I relocated my HO2 to where the 'Y' pipe comes together and made it a 4-wire. Is anyone aware if there's a latency number I need to change so the PCM knows that the HO2 sensor is further back then where it was stock (on the driver's exhaust manifold)? I've been driving for months with it back there as I slowly adjust my fuel tables and everything seems to be working well so far.

**steveo** · 02-22-2014

if your short term trims seem fairly stable i wouldn't worry about it too much. from what i've seen if the integrator latency is too low, your short term trims freak out pretty good, and the effect is much more dramatic at lower airflows.

the 0D xdf i have doesn't seem to have any delay parameters, but they might be around (not a platform i work with very much)

**EagleMark** · 02-23-2014

Yes! "Integrator Delay vs. Airflow"

**sgtpoliteness** · 02-24-2014

Great, thanks guys! Hey, Mark! Hope you're doing well.

What is 'airflow' exactly? I've found the table. For me it's 4CD7. The lower the 'airflow' number the larger the 'delay'. It's in milliseconds.

**steveo** · 02-24-2014

it's just what it sounds like.. when more air is moving through an engine, that means the exhaust is going to reach the o2 faster, and less delay occurs