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DB83

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Also, could it be a case that because i had been running a bad cat for so long the rear O2 trim has thrown everything out of whack?

Would turning the FAOSC off for a couple of hundred miles bring all the fuel trims back into speck, and then try turning the FAOSC on again?
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K4fxd

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No and No

If you can turn it off, I would. If not I'd put this in 50th place of the things I worry about.
 

DB83

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The only issue i can see from turning it off, from what i've been reading, is that the front wideband (widebands in general) has a tendency to drift as well, and that if you keep FAOSC off, they recommend replacing your front O2 every so often to keep them calibrated.

It seems as though this is a situation where you're dammed if you do and dammed if you don't!
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