Originally Posted by
Italo2275
Hi guys, I just watched this video
https://www.youtube.com/watch?v=rUBCDQHDb3g
and what this guys states near the end of the video that the idle should come down after 1o seconds and the settle. From what I am hearing when the car stops it idles up then down and then down again.
other guys say that after stopping the idle should go down instantly and stay consistent.
Is this guys wrong?
Yes he's completely wrong. If your idle hangs after a WOT run and then drops its because you're too lean on the HSN. If you're car drops to normal idle and then begins to idle up after that then your LSN is too lean. Any time your idle hangs or goes up on its own you're too lean on the top end or bottom end. If you're car idles down normally then up and down again like you said then you need to be checking for air leaks in your fuel system, carb and engine. I suspect your have a bad fuel tank cap seal. With a proper tune your engine should immediately drop to idle after WOT and stay there. After about 10 seconds it should start to blubber and richen up then almost die. At no time should your idle increase or hang on its own.