forcing car into open loop

[nacho8705]

The information i have seen about forcing the car into open loop has not been very clear. This is for a maft-pro, but this question is about the ecu in general.

Force open loop by:

disconnecting 02 sensor - this throws a code
disconnect 02 signal leaving 02 heater plugged in - no code

What is the best way? some places i have read that disconnecting it completely forces the car into limp mode, causing it to run rich and pull timing.

If just the signal is cut, does it go into open loop with out the limp mode?

Thanks in advance

[nacho8705]

no one has any input?

[935motorsports]

If you want to use your own tuning device, without the ECU getting involved, leave the stock o2 plugged in and just open (outside of exhaust).

A less ghetto way is to use an o2 sim.

[[XC] Shaz]

http://koltchak91120.files.wordpress.com/2009/06/double-facepalm.jpg

[Kai]

....why do you want to force it into open loop?

[nacho8705]

....why do you want to force it into open loop?

So that my maft-pro can control idle/non-wot afr ratios without fighting the ecu. It also allows me to use the cruise and lean-burn features. If i leave the o2 hooked up, the ECU and the maft-pro will fight each other and my AFR will bounce all over the place.

The idea is that if the stock ecu is not receiving a signal or does not detect an o2 sensor, it will go into "open loop" and will use pre-determined fuel maps that stay the same no matter what, allowing me to tune.

The question is, is there a diference between unhooking the o2 completely and cutting the signal wire?

[wardog]

Just unplugg the o2 sensor and be done with it . Thats what i did with mine and be ready to tune PT, Cruice and all that good stuff with the MAFT PRo. I got an Lc1 to keep track of my AFRs Do you have a WB ?