is this hole normal?

https://www.gmforum.com/attachment.p...ine=1390077848

is located in the back of the lower screw of the IAC valve.

Yes, its made on purpose during the mfgr process, and its designed so when the hole is tapped, the tap can go all the way through the hole.

thanks man.

im asking cause i was checking the car since it didnt pass the test i was at more than 60 mph and it died again, double checked the upper intake did everything again, no coolant no nothing, also had no leaking or anything.

so i was checking for maybe some vaccum leak, and i noticed that the IAC valve sucks air from the sides of the plug, not the conection between the body and the iac, but in the plastic, putted some carburator cleaner and it sucked it O.o, same with some water.

is that ok?, im going to check the iac (theres no check engine light on).

i heard that if i disconect the iac valve and the idle works well then the iac is bad, is that correct?.

No.

If its sucking air in where it mates to the TB, then your gasket probably gut sucked in or its not sealing well. Remove/inspect/replace.

im uploading some vids and pics.

also sometimes it take time to start "long crank" or start and dies right away, i taked the iac valve conector and it started right away "but idled to 2 x 1000 rpm"

Leave it connected, this time, crack the throttle open(I mean JUST a crack) and attempt to start. If it starts immediately, fault lies either with the IAC or its not opening all the way due to carbon buildup.

(sorry for the spanish the car is in venezuela, thats why is kinda hard to find a good GM mechanic most GM car here are those opel with new names s:)

Videos:

engine start:



and how the rpm dances alone

RPM - YouTube

also here its from where the air comes in:

https://www.gmforum.com/attachment.p...ine=1390082091

it didnt take air from the conection between the upper intake and TB but from my inexperience point of view it looks like theres an small gap between the two but again i dont know if its like that.

If the leak is right where the arrow points, then its time to replace the IAC. You'd be surprised at how much chaos a little vac leak can cause.

those iac valves are cheap i could buy one and test it.


also thanks for all the help, you are really good and helpful.

just out of curiosity why do you have a zip tie on the vacuum boot there? if it looks dry rotted or anything that will give you issues in the future as well. the fuel pressure is regulated by that and the evap purge goes into there. you will have evap code and poor running if its hard and brittle