Im not too familiar with tuning but have managed to fix my cold start and idle. I know, thats probably not task. The problem I am having I believe is pretty critical. My air fuel ratio at idle is around 5 and 6. I have no air fuel gauge hooked up currently to verify if it matches with the ems. These numbers are not good at all I assume. I hope someone can please help me with this matter.

Thanks in advance

Ryan

 

Wow I'm surprised that your car can idle at all with an AF of 5 or 6 that is stupendously rich....

It sounds like your A/F reading may be wrong, because i don't think the car would idle at all that rich. It would probably misfire and flood itself. I've never tried to run my car that rich but that is my best estimate as to what would happen.

You might want to check your wideband, if the car is idling ok but the wideband still says A/F is 5 or 6 then i would guess that the wideband is broken.

 

u want your idle at 14.7:1

 

Your units are not setup correctly and you are reading the AFR in a different unit. Also another problem could be that the wideband could be on the o2 #2 channel, what channel are you looking at when viewing AFR? there are 2 channels, o2 #1 and o2 #2, check both channels and see what channel the wideband is wired into, most evo's I have seen the o2 is on o2 #2 channel.

This is what you wanna do to read AFR in correct readings for gasoline.

in the AEM program up at the top on the right hand side goto
Configure/Units...
Now in the drop box select AFR units
Choose AFR gasoline
click apply then click ok, then save.
Now you should beable to read AFR correctly. But one thing that is easily forgotten is syncing the wideband sensor to the EMS. It's a bit of a task to do but very simple.
For syncing the wideband to the EMS to match the gauge you will need a volt meter.

Unplug the sensor from the wideband harness
find the "signal" wire from the wideband sensor (the wire that sends the AFR signal to the EMS)
Now open up the AEM program with the key turned to on position (car off and not running) and goto setup/sensors/oxygen sensors/o2 sensor #1 (or #2 depending on what channel you have the wideband on) parameters o2 sensor #x
Now it will bring up a pop up screen and where it says o2 #x volts
Now that you have that screen up, go back to setup/sensors/oxygen sensors/o2 sensor #x/options
This little box is the o2 gain. With the volt meter simply check the voltage on the signal wire of the wideband sensor, does it match the o2 #x volts? if not then use the o2 #x gain and adjust it till the voltage in the parameter matches the same voltage as the volt meter.

Good luck..

 

Very helpful.

Thanks

 

^^not a problem man, good luck with it.