EGR Problems - 1989 Jeep Comanche 4.0

[jon1998]

Hey everyone, I am trying to diagnose my EGR system for potential problems since my Jeep has a very low idle. My EGR valve works properly when I disconnect it from the transducer and apply vacuum to it. My transducer does seem to restrict vacuum to the EGR at idle, but the transducer does receive vacuum from the other end. I pulled out the EGR solenoid and ran some wires from the battery to the prongs on the connecter. When I touched the prongs I did not hear the solenoid move. My question is as to whether a bad EGR solenoid would create a vacuum leak and a resulting low idle. Thanks for any replies.

[HOrnbrod]

Do you have a multimeter? Check the solenoid and see if it's open. A good solenoid will have very little resistance (less than 10 ohms) through the windings. If it's open it's bad.

[jon1998]

I do have a multimeter, but when I removed the solenoid from the jeep, I could blow air through it so I guess the solenoid is open.

[SVPete]

In my reading, the solenoid is normally open. It is closed upon a signal from the ECU. So I'm believe blowing through it doesn't prove anything. HOrnbrod may have been referring to a multimeter reading of open (no continuity).

 

 

Wouldn't a vacuum leak cause a high idle, not a low idle?

 

Somewhere on the site is a link to the Renix Fuel Injection manual.

 

 

It is located here from BioTex

 

http://www.alpinefurniturestore.com/JeepDocumentation/MJs/Jeep_Renix_Fuel_Injection_manual.pdf

Edited July 7, 2017 by SVPete