Are there any codes?

 

This might be what you are looking at on your scan tool.. It looks like a gas engine throttle body.. Intake air valve and throttle body are the same thing on a diesel.


Intake Air (IA) Valve
The intake air (IA) valve is located upstream of the intake air heater, and is normally in the open position. The ECM commands the valve to close in order to precisely control combustion temperature control during exhaust particulate filter (EPF) regeneration. The IA valve will ensure the temperature of the exhaust gas remains in an efficient range under all operating conditions. The IA valve system uses a position sensor located within the valve assembly to monitor the position of the valve. The IA valve uses a motor to move the valve to a closed position and spring tension returns it to the open position. The motor is operated through Motor Control 1 and 2 circuits

 

No codes but I know it’s not running right by the exhaust smell it don’t smell like normal diesel smell smells strong and burns eyes like grey or white haze at idle which probably because my Air/fuel ratio is way off it’s reading 0.6 : 1 Ratio yeah that’s not a typo that’s what all 3 of my scanners are saying and the intake air flow valve heater was removed and unplugged the Intake valve is saying it’s 100% open which would mean max air flow coming in just not understanding why throttle sensor is reading 99% at idle and when I give it throttle it goes to 100% then I let off the throttle and goes back to 99% throttle at idle with foot off throttle I’ve read normal throttle should be between 10-14 % at idle anyone have any ideas or can point me in right direction

 

The Accelerator Position Sensor and Throttle Position Sensor are not the same..
The APP is what you want to monitor..
(Hook your scan tool to another truck and see what it reads) This will verify if you have a problem.
Throttle Position on the scan tool is the air intake valve.. The scan tool does not know it is gone, it's just reading what it sees with the connector unplugged..
Your chasing a ghost with your scan tool..
Your air to fuel ratio might be an air leak.. There should be codes but with deleted tuning it might not set codes..

 

If you have no CEL's and it runs and pulls fine, dont F-ck with....no sense in creating a potentially bigger problem.

 

That’s the issue it idles fine but at idle I’m getting 12psi reading on Map sensor with foot off pedal and tried to get on it and kinda seemed like it was bogged out and definitely wondering why my air/fuel ratio is reading .6 to 1 ratio shouldn’t it be like 18:1 ??? Mines at .6:1 at idle and does not change when I push on pedal

 

Duramax Diesel Airflow Leak Equivalency Ratio..
0.86:1 to 1.20:1 for a 2007-2010 LMM engine..
I don't know of any other air ratio reading from ECM.
Scan tool definitions seem to be generic.. Familiarize yourself with the readings you have so you are not chasing your tail..

If the ALER reading (with EGR position at 0%) is less than 0.86:1 for a 2007-2010 LMM engine:

Inspect for anything which could result in an unexpected rise in measured airflow. This would include leaks in the boosted side of the Turbo (not including the EGR valve) or a shifted/skewed MAF sensor. In rare cases, an aftermarket low restriction exhaust system could also cause low readings.

 

Just checked my APP on scanner on my truck and it’s reading accelerator pedal position D 18.824% and accelerator pedal position E 9.412%. Both readings are idle with foot off throttle

 

If there was an issue you would have codes..
What is is the MAF reading at idle?

 

Maf is reading 38 grams/second at idle

 

T


That is a perfectly normal reading at idle..

If you feel it is not running right, I would look at your tunes..
There's nothing else that that could be wrong without setting codes.

 

Can you view pre programmed tunes on efi live ? Like would I be able to look at the fuel and all the settings on my current tunes if so how can I do that

 

I’m new to the efi live literally just got it like a month ago before I got efi I was running a mini max tuner which it was okay but wanted more options so I upgraded to efi

 

Doesn’t sound like an upgrade. You have a bad tune. Probably the pilot injection is not correct, and pushing too much fuel. Your MAP is at 12 psi because that’s the barometric presssure.

 

I have no experience with the type of tuners you have..
Search the forum archives and maybe someone else will chime in .

 

I don't know where FOX88 is, but I'm at about 1000 ft. My map always reads a little lower than the local airport. Could be off a little but probably not the problem to be solved. MAP sensors are fairly cheap if you want to replace it.

The typical pressure at sea level is 1013.25 millibars or 14.7 pounds per square inch.

 

Last I checked my truck it was 12.7

 

Did you ever get it figured out?