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Old 03-20-2013, 02:03 PM   #16
lcoleman
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Join Date: Mar 2007
Location: the barnyard
Posts: 2,458
My Ride: '79 Massey Ferguson
A good wideband is well worth the money. That said, I don't know the algorithms for the computer to throw a CEL for lean running, nor how the ESS tune would affect that (if at all).

Perhaps see if you can plug up a generic OBD-II scanner and look at the PIDs for long-term fuel trim?

The only root causes I can think of are running too lean or charge temps too high. Did I miss you mention if you do or don't have an intercooler?
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