I am working with an LS6 which ran perfectly until I made the following change. I swapped the stock LS6 intake manifold and DBW LS1 throttle body with a TPIS modified LS6 intake plus a Soler Performance 95 mm ported LS2 silver blade throttle body also DBW, I had the car tuned by a reputable tuner. He added larger fuel injectors, However, the car now has a very unstable (hunting) idle when cold. When cold, it is un drivable and will stall as the PCM hunts and try’s to find the 925 RPM idle set point. Once the car warms up, it becomes drivable and has a stable idle, it also has some minor low to off throttle surging. I have tried the FSM procedure for relearning they throttle body many times. I am concerned that there is some throttle body table that needs to be recalibrated for the larger throttle body. When cold the air flow is larger than expected causing s lean condition. I have removed the intake and corrected any and all possible intake air leak sources. I am fully confident that there are no vacuum leaks since the intake gaskets are new and all vacuum lines have been replaced. The NAP sensor is new to make sure there is no vacuum leak at the sensor. These efforts made no change to the poor idle when cold.

I no longer live within 200 miles of the original tuner. So, I intend to talk to a new tuner about this problem., I would like someone familiar with throttle body swaps to tell me what I should ask the new tuner to do. What is the name of the table that controls the throttle body opening? How big a recalibration is required? Is there a recalibrated table available to provide to the new tuner? Can this sort of correction be made with any of the LS tuning software packages? Or is there a specific software like HP tuners that must be used? I seek expert help.

 

No need to worry. If your new tuner (whomever that may end up being) needs you to know this info, then run away. Any decent pro will know how to handle such a simple issue. If they do not, they are not worth paying. That being said, it is very likely that your previous "tuner" probably did nothing useful, so don't be surprised if the next guy tells you a full retune is required. Never trust internet reputations for tuners, as they are full of reviews from people who would never know the difference. Look at actual results from people local to you. I have seen stellar reviews for guys that barely know how to upload tunes they stole from others. On the other hand, there are thousands of good tuners that nobody has ever heard of. Find somebody with a modded car that runs good, and ask who tuned it.

 

I did some homework on this last night. I watched a few HP Academy videos and now understand better the multitude of tables that can be adjusted to resolve cam and non stock hardware issues. The tuner definitely needs to know their software! I appreciate your tip to find someone who has used a local tuner with excellent results. So, now I am looking for a true LS tuning guru in southwest Ohio.