What do the vacuum ports control?

[olgreydog7]

Short story, 99 Cobra, stock harness and ECU, tuned with SCT, big bore stroker with a Sullivan intake and the EGR deleted. I tapped the spacer for a vacuum port and I'm pretty sure it is leaking. There is a portion of the main harness that has boots on it that plug into the sensor on the end of the fuel rail, a couple that plug into the cylindrical thing that bolted to the side of the stock manifold, and two that had direct ports to the intake manifold. I know I need the sensor at the fuel rail since I am still running a returnless setup, but what about the other boots? What do they control? Can I turn them off and delete them?

 

[Janstang]

Can you take a pic and post it?

 

[olgreydog7]

Well, I googled some pics of stock intakes so I will try and describe the boots with where they go on the stocker.

This one probably goes on the p-side just forward of the EGR.

This one probably goes on the top near the center of the intake in the rear.

This is the cylinder I was talking about.

Just the whole setup.

So what do those things control/contribute too?

 

[Janstang]

Thats the DPFE, another component of the EGR system. If you have the EGR stuff turned off, disconnect it and cap the vacuum lines.

 

[olgreydog7]

both of them?

 

[Janstang]

As long as you still have the vacuum line running to your fuel rail pressure sensor the other lines I see there are for the EGR stuff.

 

[olgreydog7]

Thanks.