generation 4 MAF, I cant seem to get this e38 out of VE mode

[Larry Reed]

I've tried every thing I can find to disable VE tables. Taking Huge swings at MAF tables and not changing A/F ratio. I wonder what I'm missing?

[Nick912]

Post up your tune file

[Larry Reed]

try this

[DougO]

dump your dynamic airflow tables,to run maf only

[Jon S.]

I've tried every thing I can find to disable VE tables. Taking Huge swings at MAF tables and not changing A/F ratio. I wonder what I'm missing?

Given the tune that you posted, you have no idea what you are doing.

Bad things will follow if you do not self-educate before making changes to your calibration.

There are many, many tutorials available on the internet on the topic of "How to tune an E38 ECM".

Start reading.

Here is a photo of your current MAF settings - the E38 will only run on the MAF Sensor data above 4000 RPM.

Proper settings to always run on the MAF Sensor data are depicted in the "pink" boxes.

E38 - run on MAF Sensor only.jpg

[Larry Reed]

Given the tune that you posted, you have no idea what you are doing.

Bad things will follow if you do not self-educate before making changes to your calibration.

There are many, many tutorials available on the internet on the topic of "How to tune an E38 ECM".

Start reading.

Here is a photo of your current MAF settings - the E38 will only run on the MAF Sensor data above 4000 RPM.

Proper settings to always run on the MAF Sensor data are depicted in the "pink" boxes.

E38 - run on MAF Sensor only.jpg

thanks for your reply, its obvious I,m in over my head. If i set high rpm disable low, it hates life and wont "really" run. PIG rich. No matter what i throw at it with MAF. I have replaced the MAF sensor hoping it might resolve the issue, but no luck. FWIW, Maf is right about 3500 hz at idle.

[Jon S.]

Is this a conversion project ?

If so, there are about four mainstream MAF options - three "tube" style MAFs, and the always popular LS3 / LS7 "blade" style MAF.

All require different base programming.

The tube style MAFs are reasonably forgiving regarding their placement in the air intake piping.

The LS3 / LS7 MAF needs to be very specifically placed - exactly straight in the pipe, exactly on the pipe diameter (or centreline), away from any bends in the pipe, and away from the throttle body. GMPP (CPP) instructions list 6 inches as the minimum length of straight pipe required - with this MAF placed dead centre (3 inches of straight pipe on either side). From experience, I prefer the straight section of pipe, with the MAF in the middle, to be at least 8 inches in length .

If you do not adhere to the above, the MAF Sensor data will likely end up being erratic.

[Larry Reed]

I put the high rpm disable/reenable to where you recommended, installed factory air cleaner and ended up with about half the MAF airflow vs frequency, still on .75 to .80 lamda.

[07GTS]

u need to have a populated VE table as it always gets looked up, ur never truly MAF only, are u adjusting the maf values to suit or just changing intakes ? if u want to see if u can adjust low enough just zero out the maf table and it shouldnt run for long after startup, then u know all u have to do is adjust the values to suit

[Larry Reed]

u need to have a populated VE table as it always gets looked up, ur never truly MAF only, are u adjusting the maf values to suit or just changing intakes ? if u want to see if u can adjust low enough just zero out the maf table and it shouldnt run for long after startup, then u know all u have to do is adjust the values to suit

Kind of the answer I was looking for! Thanks