As the title says the maf reading at idle on datamaster is around the 16.o grams/sec.
The sensor is a jet that was calibrated for 36lb injector, my tune is from pcm4less they were told the calibration for the sensor.

Should the numbers be this high with this sensor/tune or is there a problem and should i be looking at the sensor itself or the tune.

 

Normal range at idle would be 6 - 10 GPS.

When you indicate the JET MAF was "calibrated for 36lb injectors", they only way they can do that (its the way they do it on Mustangs) is to bump up the signal frequency so it reads higher than the actual air flow by 50%. Hard to believe pcmforless would even tune something like that. I've never heard of it being done that way on the LT1.

 

I dont know if they tuned the computer for that. I just told them that on the order form for the tune. I was told when i bought the sensor that it would be calibrated for my 36lb injectors.
I am still working at figuring out this rich problem but not getting too far.

I read the guide that you gave me and noticed that it said the gram/sec should be between 6-10. I wasnt sure if the aftermarket sensor would change that or not...

 

You made an enormous mistake in buying an aftermarket MAF with the calibration ruined to cobble it for 36lbs injectors.

Put a stock sensor back on it and talk to pcmforless about if you need to send the pcm back, that or you could try and find a consistently good tuner instead.

 

What is the idle speed, and what are the injector pulse widths corresponding to the 16.0 GPS MAF flow?

 

In closed loop at 625 rpm pulse width is 4.03 and 4.10 and afgs is 16.98. Also lterm counts are 119/119 and sterm counts are 95/96

In open loop at 650 rpm pulse width is 7.75 and 7.69 and afgs 15.63

 

That's way out of whack.... the MAF is reporting excessive air flow, the pulse width is large enough to add extra matching fuel, and the short terms are pulling the fuel back out. The long terms should continue to drop if the short terms stay that low.

Just for the heck of it, borrow a stock, unmolested GM MAF sensor and install it.

 

I got the idle running beautiful now... turns out that because i have a big cam in the car it needs to idle around 1100 rpm. the IAC is not able to do this on its own therefor the counts are really high, mine were around 90 or so. In order to bring these down to the optimal level you need to open the throttle body blades using the throttle stopper. IAC should be between 30-50 counts closer to 30 the better.
With doing this the tps sensor gets thrown off, the voltage goes up and the pcm thinks that you are appling the pedal. In order to correct this i had to slot the tps and turn it clockwise to bring the voltage down to the optimal level, which is approx .65v mine is .70v.
This did take some time tinkering with it adjusting the stopper screw and the tps until they both are at optimal ranges.
Thank you very much to Injuneer who gave me a lot of data on how to read and understand scanning software.

hopefully this will help someone else as well.

 

http://members.***.net/chipsbyal/page/idle/#stocktbi
Do you want to go back and do it right this time???

You ignoring the aftermarket MAF overreporting airflow?

 

I bought a maf just waiting for it to arrive