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#1: Carburetor EGR port question

Posted on 2008-03-19 03:18:32 by Simpson

Does anyone have any idea how much vacuum should develop at an EGR port
on a carburetor with the engine revved to about 2000rpm?

I installed a brand spanking new Holley 2280 carburetor on my 87 Dodge
Dakota V6 engine and failed the NO part of the California smog test. The
HC and CO tests passed well below average. I came back home and
checked the action on the EGR valve. No movement on the visible piston
when the engine was revved.

The EGR valve checked out okay when tested. It opened with less than 10
inches of vacuum and stayed open indefinitely. The Coolant Vacuum Switch
Cold Closed (CVSCC) is operating correctly. The vacuum hoses involved
are all in good shape, no leaks.

I checked the vacuum at the EGR port on the brand spanking new
carburetor and only got about 1 or 2 inches of vacuum at about 2000 rpm.

Manifold vacuum is 19 inches at a 700rpm idle.

What gives?

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#2: Re: Carburetor EGR port question

Posted on 2008-03-19 07:24:15 by MasterBlaster

"Simpson" wrote

> Does anyone have any idea how much vacuum should develop at an EGR port
> on a carburetor with the engine revved to about 2000rpm?
>
> I installed a brand spanking new Holley 2280 carburetor on my 87 Dodge
> Dakota V6 engine and failed the NO part of the California smog test. The
> HC and CO tests passed well below average. I came back home and
> checked the action on the EGR valve. No movement on the visible piston
> when the engine was revved.
>
> The EGR valve checked out okay when tested. It opened with less than 10
> inches of vacuum and stayed open indefinitely. The Coolant Vacuum Switch
> Cold Closed (CVSCC) is operating correctly. The vacuum hoses involved
> are all in good shape, no leaks.
>
> I checked the vacuum at the EGR port on the brand spanking new
> carburetor and only got about 1 or 2 inches of vacuum at about 2000 rpm.
>
> Manifold vacuum is 19 inches at a 700rpm idle.
>
> What gives?

You sure you're hooked up to the right port?

A few pages of 2280 info a quick search found.....
<a href="http://www.slantsix.org/articles/choke-adjust/carb-info/2280-info.jpg" target="_blank"> http://www.slantsix.org/articles/choke-adjust/carb-info/2280 -info.jpg</a>
<a href="http://www.slantsix.org/articles/choke-adjust/carb-info/2280-info2.jpg" target="_blank"> http://www.slantsix.org/articles/choke-adjust/carb-info/2280 -info2.jpg</a>
<a href="http://www.slantsix.org/articles/choke-adjust/carb-info/2280-info3.jpg" target="_blank"> http://www.slantsix.org/articles/choke-adjust/carb-info/2280 -info3.jpg</a>
<a href="http://www.slantsix.org/articles/choke-adjust/carb-info/2280-info4.jpg" target="_blank"> http://www.slantsix.org/articles/choke-adjust/carb-info/2280 -info4.jpg</a>

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