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Old 06-02-2014, 08:30 PM   #1
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Default Wideband looking like a narrowband???

I cruising down the freeway at a constant rpm.
I look at my wideband and it's going back and forth like a narrowband.
Had A tune done by Savington in February and it was running great.
Still feels great now but I don't want to do any damage just in case.
Would a leaky resonator cause it to act this way?
Looked under the car and there's no exhaust leak by the cat or by the sensor.
Just residue from a plastic bag on the cat and a hole, 1 inch long but narrow, on the resonator (halfway between muffler and cat) front scraping the ground too once many times.

Anything else I should look for? Corrupt tune?

Thanks
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Old 06-02-2014, 08:36 PM   #2
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What ECU?
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Old 06-02-2014, 10:20 PM   #3
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what brand of wideband and are you sure your wideband isn't set to narrowband simulation?
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Old 06-02-2014, 11:07 PM   #4
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Quote:
Originally Posted by Halcyon View Post
I look at my wideband and it's going back and forth like a narrowband.

MYTH:
Narrowband sensors oscillate back and forth, while wideband sensors tend to run at a stable AFR.

FACT:
The O2 sensor, be it wideband or narrowband, simply shows you what the ECU is doing. If the ECU is running in closed-loop mode then you will see oscillations in the AFR. The type of ECU, size of injectors, closed-loop software configuration, and engine operating parameters (temp, load, RPM, etc) will all have an effect on the period and amplitude of the oscillation.
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Old 06-03-2014, 01:47 AM   #5
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Using a ms2 w AEM uego 6 in 1.
Wideband fluctuates but not like its doing now.
From full lean to full rich.
Someone suggested dead sensor but its reading under boost. So ill check once more for exhaust leak before the sensor.
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