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88.xdf
91 V6

I'm trying to work through the VE tables and had a question. When does the ECM pull out of the Idle VE and go to Main VE?

Also, what is the point of having the VE Adder vs RPM table? Can I zero it out and transfer it all to the Main and Idle VE tables to make it easier to read?

 

The idle table is used whenever the ECM is in idle mode and the RPM is less then 1600. If not in idle mode or the RPM is 1600 or higher, then the main table is used.

Idle mode is defined by the TPS% and vehicle speed. These parameters are at locations:

$703 & $704 are the MPH hysterisis pair.

$FC6 & $FC7 are the TPS% hysterisis pair.

Which also happen to be used for which BLM cell to use.

The VE Adder table is a pita. And at the same time you shouldn't zero it at. The VE falls off as the RPM climbs, if the adder is zero'd you won't be able to compensate for this.

RBob.

 

Looking at the tables it makes sense about the VE tables. The Main VE stops at 4000RPM. I assume that the computer uses the last value of VE for RPM values higher than 4000? The VE Adder table would be the only thing to cut fuel at higher rpm due to manifold inefficiencies.

For tuning Idle VE, should I make changes and then copy the Idle VE values over to the appropriate Main VE table RPM/kPA values when I get the Idle VE down good?