hello
what's the purpose of the vacuum line that goes from the intake manifold to the iacv, and what will happen if i block or delete it?
thanks

 

The first thing the IACV does is helps set the idle. So, for example, upon cold startup, it adjusts to allow air in so your idle isn't going up and down until it warms up. Without it, I would think you would have a "wild" idle.

The second thing it does is make adjustments under load, so as the car goes lean when you get on the gas, it adjust air mixture as well to provide a linear response and not jerky.

I would presume if you block it you will get knock as the car leans out and the computer will correct for it, but it will be slower since there is no info or adjustment coming from the IACV.

I would also presume (but don't know) that eventually you would get a sensor error on the car computer since it's not getting any signal.

After all that, is it defective and you want to bypass it? Often (but not always), taking it apart and cleaning it will fix it.

 

so the engine pulls air from the iacv through the little holes in the injectors hollows and the recess in the head, like in the picture, and the ecu considers the amount of vacuum in the iacv?


it's a long story why i want to delete it, but in DX models it doesn't exist.

 

I hear you. I would presume you would need to leave it plugged in or get an error, but I suppose you could put a golf tee into the hole so you don't have a leak and the sensor will just not respond but will say it's active. Very interesting it's not on all engines. I don't know how to disable it. I learned something new.

Thinking out loud, I presume the computer is Mass density or simply has a different way of dealing with idle and load from other sensor. So...if you are putting it back into an engine that never had it, and a computer that never looked for it, it shouldn't matter if you plug the hole since there is no sensor being read by the computer anyway.