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AIR in open loop vs. fuel

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Old Jun 8, 2001 | 01:36 PM
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Aaron's 87's Avatar
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AIR in open loop vs. fuel

AIR is being directed to my exhaust manifolds in open loop. How does this effect the open loop fuel tuning? My O2 sensors starts reading pretty quickly and I wonder if there's enough air going into the exhaust manifolds to give me a false lean O2 reading.

Right now, I've got my open loop fuel set so that the O2 starts cross-counting as soon as it's up to temp. But, the car smells rich. When I spray carb cleaner in the TB, it almost kills it, which I take to mean that it's way rich. Any ideas?
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Old Jun 8, 2001 | 05:26 PM
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Grumpy's Avatar
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From: In reality
Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
<font face="Verdana, Arial" size="2">Originally posted by Aaron's 87:
AIR is being directed to my exhaust manifolds in open loop. How does this effect the open loop fuel tuning? My O2 sensors starts reading pretty quickly and I wonder if there's enough air going into the exhaust manifolds to give me a false lean O2 reading.
Right now, I've got my open loop fuel set so that the O2 starts cross-counting as soon as it's up to temp. But, the car smells rich. When I spray carb cleaner in the TB, it almost kills it, which I take to mean that it's way rich. Any ideas?
</font>
Open loop means the ecm is ignoring the O2 sensor so it doesn't matter how much air the pump is putting in, and in comparison to the engines exhuast ain't much anyway.
Open loop is richer then closed loop
Spraying enough of anything in the TB will kill the engine.
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Old Jun 9, 2001 | 12:23 PM
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I just wanted to see if AIR was causing a leaner than reality signal. I'm going to just pull off the whole AIR system anyway. Which will probably be the same day we get emissions testing.
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