Having some idling issues with My b18c1....idled fine until I put on my turbo kit, and also did a IM upgrade to skunk2 ultra manifold with 70mm Skunk2 ALPHA TB

Im pretty confident that it is not a vacuum leak as I have used a boost leak tester and pushed 20 psi into motor and charge pipes and I found a bunch of small ones (mostly in charge pipes) which only appear at high boost levels.

Heres what it does, it will surge between 1k and 1.5k every 7 seconds until its warmed up, once warm it will idle high about 1300-1500 depending.

My idle adjust screw is set to its lowest setting
My throttle body has no FITV, I was thinking IACV problem so i have one on order just in case
(my idle was fine before doing upgrades so i dont really think it is the IACV, also already tried cleaning it)
I have my IM set to suck vaccuum from my VC to suck up oil vapor (if I block this off it Idles at 1k)
If I block off my IACV port it does not surge and idles at 1K

Read some ppl saying sometimes the computer wont control the IACV correctly, I hope thats not the problem, but definetly a possibility

Im running Hondata s300 setup

Is this just a tunning issue? (im on a basemap)
anything else you guys think I should try?

Thanks

EDIT: just found an article I think I need to recheck my tps, I did calibrate it prior to install but that looks like it could be the issue.

 

after Reading an Hondata article Looks like I need to verify my TPS as I also have other symptoms such as jerky power at low speed. I have never done any tunning and this is my first s300. Looks like I need to get a laptop and familirize myself with the program the article showed me some settings I can try, base idle settings, and duty cycle of IACV and the tps settings

"The solution is to alter the behaviour of the idle speed components so the system is stable again. Usually adjusting the TPS, idle bypass valve, mixture and ignition will cure an unstable idle."

 

Sounds like you might have it figured out. good luck with the repair

 

steps to follow, in this order:

1) adjust the actual tps sensor to 0.45v at closed throttle. do it with a cold motor. then check it with a hot motor. if the readings are different between cold and hot by more than 0.05v, you'll know why I avoid junk2 TB's. it's not all of them that do it, but some do, and it makes tuning a pain
2) calibrate the tps readings in smanager according to the article you read. make sure you save the new map, and make sure it actually gets sent to the ecu.
3) GET A PROFESSIONAL TUNE!!!!! basemaps WILL blow your motor up and make it run like absolute garbage up to that point of catastrophy!!!! especially now that you swapped the IM and TB!

 

Yea tested the voltage last night, Im getting .49v at the ecu, I read something somewhere that said shoot for .5v. Hondata is asking for .45v so I will make this correction

Car is not daily driven just working out these issues so it can be tuned correctly by a professional

by the way if I do have issues with my TB, which one would you recomend as a replacement?

Thankyou