Quote:
Originally Posted by Dezoris
The intake manifold is under vacuum, the ECU is adjusting for this vacuum. It is also variable, based on load.
If you block off the port you are changing the vacuum pressure/IM pressure. (Simulating a clogged PCV Valve)
The ECU responds by adjusting fuel trims. And the idle will also drop.
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I agree with your first statement. I still don't see the blocking off of that port changing the amount of vacuum that the engine develops at idle. I will have to plug mine and verify this.