stock 05 5.3 - why is commanded/delivered fuel so far off? AutoVE

[joecar]

See posts #29 and #4 here: Summary-Notes

[gm22j]

Good info. Thanks!

[picnic_george]

I agree with you (can set PE to any value, including 1)...

the problem I see very often is that B3605 gets set to say 1.16 lambda (rather than EQR)(due to software installation defaulting to lambda)... if PE was left as stock then it offers protection from this inadvertent mistake.


( some people did not realize software defaults to lambda... not everyone pays attention to units displayed on upper right of table displays )

Not everyone does what you said (about making sure).

I always make sure I'm reading lambda or eqr before I make any adjustments, that could be a very costly mistake. But i completly understand what you are saying.

Does it matter if PE is on at 1.16 or commanded(B3605 I assume) is set to 1.16eqr/.86lambda . Will the results be as accuratel? Like I said I've had no issues using either. Obviously leaving PE enabled makes the process a step quicker, but I thought there was some data that was not as accurate during transition. Sorry for thread jacking, seems like a good place to ask since it was brought up to use PE.

[joecar]

The PCM selects the richest commanded fueling from the currently active tables...

in OL, B3605 is always active;
when PE enables, B3618 becomes active;
at the current operating point (cell) in those tables the PCM selects the richest commanded fueling;

so it does not matter where you set your at-load enrichment (B3605 or B3618).

PE usually enables when throttle is swung wide open... this typically causes transition from B3605 to B3618 (see B3616)... but because the throttle is moving, the transient filter removes this (if you remember to apply it).