Why is AFR off so much from bank to bank with dual wideband?

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10-16-2015, 04:30 PM

#21

mrvedit

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On LS engines the STFT work on each bank independently, perhaps they do on your Ford engine too. That would explain why the widebands are rarely in agreement.

Personally, I welcome all car enthusiasts.

Last edited by mrvedit; 10-17-2015 at 09:06 AM. Reason: Typo

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10-17-2015, 05:47 AM

#22

joecar

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Why is AFR off so much from bank to bank with dual wideband?

Also do this: swap widebands between banks, see if their readings stay or follow.

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10-17-2015, 06:35 PM

#23

murphinator

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Mercury Marauders are badass - even if their fueling is jacked up lol

most engines have one bank that is known to report leaner , use the leaner number for a safety margin.

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10-22-2015, 07:22 PM

#24

LilJayV10

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Quote:

Originally Posted by mrvedit

I have two widebands. With my 19* cam, at idle the two are often 1.0 AFR different.
At high throttle only about 0.2 AFR different.

A much leaner side might indicate you have a vacuum leak on that side.

My guess is due to the the overlap contaminating the intake charge which is seen on the WB.

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