Idling issues

Hi Everyone. I had a running tune and I upgraded to Ethrottle, that worked fine. Then I changed the injectors and now I can’t get it to idle after changing the injector settings and also the idle control to Ethrottle.

totally lost and don’t want to make any more changes before understanding what the issue is. I’m getting a rapid increase in rpm upon starting rather than an idle with requires immediate shutoff.

Sounds possibly more like an air leak assuming the TP is showing a similar idle position compared to pre injector change.

As Adam suggests - I'd start with a basic double check there weren't any hoses or fittings missed, damaged or dislodged that would be allowing air in - it's especially easy to overlook those underneath or behind the plenum.

Then i'd use some engine start/ether/brakeclean spray around the injectors - they may not be a perfectly dimensioned replacement part, incorrectly seated, or the "O"-rings may be damaged, and if there's an air leak the spray will be drawn in and flair the rpms.

thanks so much for the advice, i did indeed have a vacuum leak.

I do have another question, i have been working through the idle tutorial and i have the open loop idle pretty stable. When i change it to closed loop, it hunts. I have some logs and the tune if that helps, but I cannot figure out why its hunting when its steady in open loop. thank you for your patience with me, learning fast!

Too much integral gain, a typical value for E-throttle idle control in G4X is 0.02-0.05, yours is currently 0.4, so about 10X more than I'd expect.