E85 - P0171 too lean code - Long Term Fuel Trims + 12.5%
#61
EvoM Guru
iTrader: (50)
Those trims are not unreasonable, especially for a big injector and a tune that probably didn't focus strongly on tight fuel trims. The hole in the MBC can, and should have been, accounted for in the tune, however, check valve isn't a bad idea as long as you use a quality one that has a very low opening pressure. Otherwise, I'd say just get a retune on closed loop.
#63
I understand, I'm just surprised blocking it off at idle had that much affect on the trims so quickly. Since it serves no function when the manifold is full of vacuum, I think it would be a more "pure" solution to put a check valve inline the control hose and only allow boost pressure in, right?
I understand completely, but rather than compensate in the tune I do like the check valve idea - any suggestions on a product?
I would think in an ideal world the MAF would account for all of the fuel determination.
Those trims are not unreasonable, especially for a big injector and a tune that probably didn't focus strongly on tight fuel trims. The hole in the MBC can, and should have been, accounted for in the tune, however, check valve isn't a bad idea as long as you use a quality one that has a very low opening pressure. Otherwise, I'd say just get a retune on closed loop.
I would think in an ideal world the MAF would account for all of the fuel determination.
#64
EvoM Guru
iTrader: (50)
http://www.boombaracing.com/check-valve-5-mm-3-16/
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