Alan Wasilewski wrote:
>
> Hello All,
>
> Does anyone know the vacuum hose routing to the EGR modulator on a 1995
> Dakota with the 2.5L four cylinder engine? I hope I've identified this
> part right and/or am calling it by the right name. The modulator (as I
> am calling it) is the plastic diaphragm-type part attached to the EGR
> valve that has 2 horizontal hose connections on top and one vertical
> hose connection on the bottom.
>
> The problem is (if I'm correct) that this part is connected only to the
> EGR valve and not to any ported vacuum source. Specifically, the
> modulator has hose connections to the base and top of the EGR valve, but
> the hose connection on the modulator that points at the throttle body
> doesn't connect to anything: it's open. My limited understanding of
> this system tells me this isn't right; however, I couldn't find any
> "stray" vacuum ports to connect this open fitting to.
>
> Anyone know what this missing link is? Normally I would just bite the
> bullet and buy a manual; but, I have to retest the truck for emissions
> tomorrow. (Failed for high NOx, usually indicative of high combustion
> chamber temps I am told, and I am betting this is somehow related.)
> Thanks in advance for any help.
>
> Alan
>
>
As far as I know there are only two connections - there should be a
vavvume/egr routing diagram on the underside of your hood. Also - on my
89 V6 - the black plastic part connects one side to the metal part of
the EGR valve and the other to a metal tube (below) that pipes back the
the metal surface that bolts to the engine. My manuals are out in The
Swamp - I'll have to get them tomarrow to double check. I'm not sure -
that 3rd port may or may not need to go to atmosphere.
-- -------------------------------------------------------------------------------- Terrible Tom"It's a living thing... It breathes, it eats, ...and it hates..."
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