Craig Moates

OK, here's the code, right? Just looking for some more clarity around the dynamic impact of what each of the parameters does, and how it all plays together. My system runs too rich for my taste upon decel, and looking to tone it down some.

LC4E3 FCB 40 ; 40, ENAB DCEL INT RESET IF LD VAL <= THRESH
LC4E4 FCB 28 ; 700 RPM, Enab Dcel Int Reset If RPM GT THRESH;cal = Arg/25
LC4E5 FCB 255 ; TPS FILTER COEF FOR DECEL;cal = Arg * 255
LC4E6 FCB 240 ; 93.8%, DIFF TPS% THRESHOLD FOR DECEL ENLEAN;cal = Arg * 2.56, (93%)
LC4E7 FCB 245 ; 245, DIFF LV8 THRESH OF DECEL ENLEAN;cal = Arg
LC4E8 FCB 0 ; 0 sec's TIME TO MAINT DECEL ENLEAN;CALIB = Arg * 80
LC4E9 FCB 0 ; 0, DECEL ENLEAN T/F DEFAULT;CAL = 2.56 * Arg
LC4EA FCB 128 ; 0.0375, LMT FUEL FACTOR TIMES BPW FOR DRP 1 TO K
LC4EB FCB 128 ; 0.0375, LMT FUEL FACTOR TIMES BPW FOR DRP GT K;CAL = Arg * 128

RBob

iTrader: (1)

Looks like it is disabled. Decel enleanment is typically enabled with a closing throttle and falling MAP (or LV8 in this case). The delta TPS & delta LV8 is derived from lagged values vs current values.

The lagged TPS term is filtered with a 255 (LC4E5), basically no filter, so no lag. Then the required delta TPS to enable enleanment is set to 240 (LC4E6). Hard to reach.

Once enabled the multipliers at LC4EA and LC4EB are used to lower the PW. The duration of enleanment controlled by the term at LC4E8.

Holding the INT in reset will prevent the closed loop fueling control from (over)compensating for the enleanment.

Decel enleanment is typically used for a short duration during throttle lift. It compensates for the fuel layer on the manifold walls evaporating under a falling MAP condition.

RBob.

JohnL

Is that what's happening at LC4EA and B? And can you tell me what E9's T/F is about?

Does this mean that Craig's problem is more likely related to how the DFCO works?

John