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Re: EGR cleaning on 03 6.0L
Rereading the TSB (06-19-06) a little more slowly I see that the reason for running the KOEO test is to avoid any false P0404s... I'd struggled a couple of times with the idea that 0% duty cycle should have a closed valve and vowed to check it closer someday....
So... cleaning the valve and reinstalling it without performing the On Demand test should not yield any new driveability concerns.... BUT (there's always one of those, isn't there?)... if a P0404 DTC returns afterwards, we can't be sure if it is because a concern with the valve remains or if it is "induced" unlessthe KOEO test is run...
To avoid confusion.... retrieving and clearing memory codes with a code reader or tuner is NOT the same as running the KOEO On Demand test.
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