Hello

I noticed a trend when tuning. I dont know if i miss something and hope you can help share some light over this.
At low MAP ( 20-25 ), and with no TPS ( throttel off ), like when you coasting downhill, or when you let of the throttel after accel.
The car goes whery lean, at 140-150 BLM.I can see no evidence in the log that de-accel as been activated, I still got inj DC etc.
And as soon as I apply tps ( throttel ), the O2 goes rich and the BLM starts to go down to a more reasonable value.
If I try to change the VE in those areas, to achive a BLM of 128 ( or around ). I must increase the value so much that the VE number is higher at 20-25 KPA then 30 and up ( to a ceratin point ofcourse ).
Does the ECM "do" something during those conditions that ( for my case ) datamaster dont "see" ?
Its not a probleme, i dont experience any driving issues with it. But it always catch my mind when the BLM rocket to 150 from 120/128 like it does in this case.

Thanks

 

Id just ignore it and set the closed loop MAP thresholds up so the ECM is in open loop during decel. The PW is real low there, and the injectors may not deliver the proper fuel. It may also be in decel fuel cut-off.

 

Great tips regarding the "the closed loop MAP threshold".
I dont think its in decel fuel cut-off, cause I still get inj DC and blm corrections.
And when I do enter decel fuel cut-off i do not have DC or BLM corrections in datamaster.

Thanks

 

Check your Decel Enleanment settings as well.

 

Hmmm never fiddle with that..
Where in the prom is that?

So "Decel Enleanment" is enabel when the TPS is 0 and at low maps?
I know that im not in decel fuelcutoff.
Perhaps its "Decel Enleanment" i se?

thanks

 

Interesting. I like that idea- like have closed come on at MAP >15. That May cure the psuedo-same quirk on my truck.
Good idea

 

Yeah, havent found it yet thou.. :/