EVAP Purge strategy

[stevesingo]

Does anyone know under what conditions the EVAP purge valve should operate?

Cheers

Steve

[stevesingo]

Thanks for the response. The reason I asked is not for checking functionality, but to program my ECU (M800) to control it. I know that I could just disconnect it and vent the fumes to air, but I want to keep it if I can.

Edited to add that this is a 1990 BMW M3, not something modern! The valve appears to be a simple solenoid device, but I can fit a valve from a newer model easy enough.

Cheers

Steve

Edited by stevesingo on Thursday 20th January 09:09

[stevesingo]

Perfect! I didn't appreciate how significant the enrichening of the mixture could be under valve pen conditions.

I will use your table as a start and moniter the AFR corrections made by the WBO2 control.

Thanks

Steve

[stevesingo]

I might still do!

Steve

[stevesingo]

I did and the Lambda control takes care of the enrichening due to fuel vapour just fine.

[stevesingo]

I'm far from an expert, but I would think it is the same. I.e, no EVAP purge at MAP =1 or higher, otherwise you are pressurising the tank.