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Been radio silence for a while on this. Will be starting wiring on our new build beginning of March. Looks like we are going to have to go holley for now

We are currently building a new truck to run small tire classes. Would love to use this if boost control, trans brake staging, and traction control all are available.

It is fixed finally. Just thought I would let everyone know that a new PCM fixed every problem I was having.

Let me make a list of what I have checked and tried.

1. All grounds are good: PCM, Battery to engine and body, both on back of the motor, and the one by the power steering pump.
2. Fuel pressure...

Current Tune

The injectors I had that I posted above were mystery injectors that came with a TVS1900 kit. So I decided to get good injectors with known data. Okay, I have installed new LS3 injectors from Jon at...

Pictures of my injectors.
http://performancetrucks.net/forums/attachment.php?attachmentid=51174&d=1267016569
http://performancetrucks.net/forums/attachment.php?attachmentid=51175&d=1267016569...

Thank you, went back and looked at the stock tune. IFR table is all the same. Changed mine but will have to wait till I can afford to get good injector data.

You were right about not being a fuel pressure issue. The pressure is 52psi with vacuum and 60psi when I disconnect the vacuum hose. However, my gas smells really funny. It is not a sharp odor like I...

Could you put the sensor in some water and measure the resistance and as you slowly raised the temperature? Sounds time consuming but could work. I had to do a similar test in a college advance...

Could a bad fuel pump cause this? I have not tested the pressure yet but will tomorrow after work. The reason I ask is it just seems odd that it ran fine on the wrong injector data for 200mi. Then it...

Yes, you have to log the AC Pressure for your readings. Since it uses the ac pressure wiring it has to log the pid for AC Pressure. Then it uses that reading to calculate the AFR formula that you put...

Found some one else having the same problem.

http://www.hptuners.com/forum/showthread.php?t=34600

I have never had this motor setup be this sensitive to VE changes. The AFR%Error wants me to change say 20. But in reality if I change more than 1 it goes rich or lean. Are you thinking that it is my...

Do you have [PID.7101] added to the table in the scanner?

I think you can change the data on the tables to make it read right. I am sure someone already has this data somewhere.
Engine Diagnostics/Airflow/IAT Sensor Cal

Here is the results of 0 Maf table and trying to get the VE as close as possible. Still have to use very small adjustments like changes of .5 to get it close and not rich or lean. Can't figure out...

I am having a very similar problem. Subscribed.

Good Luck

I have one for a 1999.

I have zeroed the Maf table and will try to adjust the cold start. Will try adjusted tune tomorrow. Getting late and need to go to bed. Plus think I might make my neighbors mad if I keep cranking the...

In my mind it should not change lean to rich my just such a small amount of adjustment. I am starting to think it might be a hardware/mechanical issue instead of tune.

Would not let me post last log.

Tried modified tune like said in PM.
Then added fuel in 5% increments just to check. Then logged each one.

Here is stock tune.

The big question for me is why did it run great for 200mi. While I was tuning then I parked it for six hours. Got back in it and everything was crap.