What Is This For?

[jnr32r]

Just wondering if anyone know what this does?

If not to crucial i was thinking of removing it and just have a straight thru vac. line...

[RedDrifter]

Its the cold start idle up valve. When you are starting the car the ecu opens up the valve to allow more air to bypass the throttle body and straight into the plenum and giving the motor a boost of air to help it start.

If you are usening an after market ecu then you may not use it.

[VHR32]

If you are usening an after market ecu then you may not use it.

RedDrifter was spot on.

You will probably need to use it, it only needs a +12V to operate.

Unless you are using a different throttle body which has a stepper motor ie XF, then an aftermarket ECU may be able to to control this and you can remove the Nissan idle valve.

[BHDave]

It's not ecu controlled, it's a got a thermal thingy for opening up on cold start.

I removed it on my rb20 after one of the pipes to it split. All it does is open up when the car is cold and progressively close as it heats up. Mine would stall when returning to idle during the first 3 minutes of running with the stock ecu, then no probs after that.