Truck running rich

EnglishAdam

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Jul 11, 2005
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England
I'm a bit stumped here :shrug:

Last year when I dyno'd, my A/F was a lovely 11.8-1 across the board.
Today, I dyno'd with the same tune and it's now 10.9/11-1.
My new wideband conforms this and the exhaust tips are black.

I have ported the blower and fitted a new exhaust since then.
Does anyone think this would affect it that much?
 

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