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On a 1994 gmc 350 4x4 the vacuum cuming from the egr valve going to a little blak box has no vacuum to it but on the other side goint to the thottl body has vacuum to it

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Does the box have an electrical connector? If it does, it would be a solenoid that is commanded by the computer to turn on and send the vacuum signal on from the intake to the egr valve. It would do so when the engine is at normal operating temperature and is accelerated from off idle to higher rpms. The EGR valve would not open at idle, so there would be no vacuum signal to it during idle. If you open the throttle up a bit (with the engine warm) the vacuum signal should be going to the EGR valve.

Posted on Feb 15, 2014


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Sorry I dont have a pic. for you. But here are instructions. The EGR valve is located at the top right of the engine next to the throttle body. REMOVAL & INSTALLATION
Except Linear EGR Valve

Disconnect the negative battery cable.
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Remove the EGR bolts and/or nuts and remove the EGR valve and gasket.
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Disconnect the negative battery cable.
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Unplug the valve electrical connection..
Unfasten the valve retainers, then remove the valve and the gasket.

To install:
Clean all gasket residue from the gasket mating surfaces.
Install a new gasket and the valve.
Install the valve retainers.
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Attach the valve electrical connections and connect the negative battery cable.

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