Morning all:

There is no discernible vacuum at idle on the EGR when I remove the hose. Also, there is vacuum on the engine side port on the airbox, but not on the fender side port that connects to a metal disk toward the front of the Jeep.

Is this how it is supposed to be? Would these be connected to the Jeep running super rich?

Thanks in advance,
Jan

 

There should be vacuum at the solenoid, but not at the valve.

 

Thanks for the feedback! I'm not seeing a vacuum solenoid on the parts site. I'm assuming it needs to be replaced since there is no vacuum there.

Is the solenoid sold under another name, or is it a component of something else?

 

The solenoid is along the edge of the engine compartment, near the ceramic resistor, and there shouldn't be vacuum there at idle. Here is a link to some testing steps, you'll have to scroll down a bit to get the EGR stuff:
http://www.lunghd.com/Tech_Articles/...iagnostics.htm

I'm not sure if this is relevant to non-Renix XJs, but it may help.

 

Dont spread misinformation... Yes there should

 

TESTING THE EGR VALVE

Valve Opening Test
1) With engine at normal operating temperature and at idle,
rapidly open and close throttle. Open throttle sufficiently to obtain
at least 1500 RPM. Movement should be noticed in EGR diaphragm.
2) If diaphragm does not move, probable causes are: faulty
vacuum signal to EGR, defective EGR diaphragm or defective
backpressure sensor diaphragm (if equipped), or leaks in vacuum lines
or connections.
Valve Closing Test
1) With engine at normal operating temperature and at idle,
manually depress EGR valve diaphragm. RPM should immediately drop,
indicating that EGR valve is not leaking and had been properly cutting
off exhaust gas flow at idle.
2) If there is no change in RPM and engine is idling
properly, exhaust gases are not reaching combustion chamber. Check for
plugged passage between EGR valve and intake manifold.
3) If engine idles poorly and RPM is not greatly affected by
manually moving diaphragm up, EGR valve is not closing off exhaust gas
flow. Check for carbon between pintle, leaking EGR valve gasket or bad
EGR valve.

 

Sorry, I meant on the output side of the connection. That confused me when I was checking for vacuum leaks, there isn't a vacuum on the other side of the connector until you unplug the sensor. My apologies for being unclear.