YEs, i can verify it is a solid .586 everytime it closes. About how many turns should i adjust the idle screw and can i access the IAC valve with it on the motor? I have never tried. I will do it tomorrow in the daylight since the world seems to think it has to get dark at 6:30. Should i leave it set at the lower idle or readjust back to "normal" i dont have a Tach so not sure what it idles at. But i do sometimes have to give it some throttle while its idling to get it to go into closed loop (idle lower like its supposed to) I dont know how many miles are on the motor since it isnt the original. Also when i took the TBI off i noticed the IAC doesnt sit flush, it is alway open a little, is it supposed to be?that TPS reading is perfect..
can you verify that each time it closes it reads the same..
did you see about stuffing a rag into the idle air bypass passage to block it.
then adjusting T15 idle stop screw to a very low idle speed... pull the shop towel back out and the idle will surge.. don't worry.. grap the throttle and take the RPMS to 1500 to 2000 and hold it stable there for 20 seconds.. then slowly return to idle.. that gives the computer the time to relearn the idle air position. you can shut it off.. wait 10 seconds and restart it without touching the gas..
this is a manual that covers both TBI and PFI for marine applications.. but it is the same testing for your preobd2 system. there is some there that does not cover your system. but a great idea.. in the first few pages . look at the CLEAR FLOOD mode.. that is why you need to have the TPS at the proper position and NOT vary..