#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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