m20 eta icv top screw?

[mr.vang]

where should the screw on top of the icv be at? mine was half way open causing it to idle high. i screw it in to where its almost in close position and now the idle is much better (at 800rpm). can someone check the position of the screw on their eta icv?

[jlevie]

The position of the screw is a function of the condition of the engine and whether there are any intake leaks. Needing the screw almost all the way in suggests that intake leaks are present.

[mr.vang]

The position of the screw is a function of the condition of the engine and whether there are any intake leaks. Needing the screw almost all the way in suggests that intake leaks are present.

so the screw should be half way open??

[mr.vang]

anybody else

[reelizmpro]

Jlevie is right on the money. What more do u need? There is no correct position.

[mr.vang]

Jlevie is right on the money. What more do u need? There is no correct position.

i suspect the PO has open up the screw at some point. so your saying every e30 come with their icv in different position?

[jlevie]

In the general case an adjustable system, like the ICV, will be designed for the adjustment to be near the middle of the range initially. That allows later compensation in either direction to account for minor changes. The need to turn the adjustment all of the way down to get a reasonable idle suggests that air is leaking into the intake someplace. Find and fix that and you'll probably wind up readjusting the bypass screw closer to the middle of the range. The only certain way to find and and all intake leaks is to have a smoke test run.

[mr.vang]

In the general case an adjustable system, like the ICV, will be designed for the adjustment to be near the middle of the range initially. That allows later compensation in either direction to account for minor changes. The need to turn the adjustment all of the way down to get a reasonable idle suggests that air is leaking into the intake someplace. Find and fix that and you'll probably wind up readjusting the bypass screw closer to the middle of the range. The only certain way to find and and all intake leaks is to have a smoke test run.

ahww, i see... thanks, now its time for a smoke test