02 sensor off closed loop

855 Views 6 Replies 4 Participants Last post by TheKurgan, Jul 8, 2009

tornthorn

Discussion Starter · Jul 8, 2009

I have read that most tuners dissable the 02 sensor, if this is true how does the car adjust for lean/rich fuel for closed loop operation?

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toorbeenee

· #2 · Jul 8, 2009

tornthorn said:
I have read that most tuners dissable the 02 sensor, if this is true how does the car adjust for lean/rich fuel for closed loop operation?

the tuner only disable the rear o2...the front ones still working...thats how you get all the reading for rich/lean:bigthumbsup

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TheKurgan

· #3 · Jul 8, 2009

toorbeenee said:
the tuner only disable the rear o2...the front ones still working...thats how you get all the reading for rich/lean:bigthumbsup

Not always. All of my 02 sensors are off. If this is the case then the car doesn't adjust for lean/rich mixture. You can adjust that in the tune yourself if your tuner trusts you

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stlwagon

· #4 · Jul 8, 2009

Running in open loop is not the best way for most folks to run.

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TheKurgan

· #5 · Jul 8, 2009

stlwagon said:
Running in open loop is not the best way for most folks to run.

I agree and that's why most tuners don't leave those options open in the tune or at least they don't leave room for much adjustment. An accurate wideband is an absolute must.

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stlwagon

· #6 · Jul 8, 2009

TheKurgan said:
I agree and that's why most tuners don't leave those options open in the tune or at least they don't leave room for much adjustment. An accurate wideband is an absolute must.

You really have to know what you're doing to tune that way.

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TheKurgan

· #7 · Jul 8, 2009

stlwagon said:
You really have to know what you're doing to tune that way.

Or if you paid $600 for a dyno tune and tell your tuner to leave those options wide open

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