I just recently installed the ls4 tb and it idles fine for a while but i am commanding a 800 idle so it starts to surge, is there a way to get it to stay at 800. Also when I turn on the ac it surges really bad at idle. The last problem i have is that when i take it out of gear to coast to a stop my rpm stay at 1500 till i slow down to about 10 mph then it finally goes down, whats the cure for this? Thanks for all your help.

 

in 4 an answer

 

You tuned for the TB right?

 

Yes I did change the value, but after it sits at a light it starts to surge. I'm commanding 800 but getting 850 and a surge

 

Vacuum lines in good shape and all of them attached?

 

Who tunes u. R u tuned via maf or ve or both as in settings for dynamic airflow. What type of injectors do u have and did this just start happening after u installed the tb

 

Myself, maf, 60#inj, yes after tb, but I did change the idle rpm from 900 to 800. The 900 was set by pyscosteve. But I'm also having problems when I turn on the ac.

 

Tune ure maf and tune the ve again after u calibrate the thottle body. zzp has settings to calibrate Ure throttle body also check it out.....

 

Ok sounds good ill check back in tomorrow and let you know, I know I should of retuned the maf but never did

 

What are ur fuel trims like at idle?

 

He don't know but mine are -3 and +2

Jk bro lol I say ure problem is u need to calibrate the tv into airflow at idle not just idle rpm