Hello all. I have an intermittent idle problem that I have traced to a bank of 3 vacuum solenoids mounted on the passenger side fender well. One of the solenoids (I think it was the center one.) goes to the carb. linkage and to a vacuum source. I believe it operates the idle linkage as I can feel the peddle depress when it decides to engage. These vacuum solenoids are also wired but I do not know where the wires go as they are bundled and encased. I'm trying to figure out if these solenoids are vacuum operated or electrically operated and if electric, by what device.

The truck idles great when working and runs fine working or not. It can occur whether the motor is hot or cold. The truck is a 22r, manual trans with 200,000 miles. It is smogged for CA. I have run the vacuum lines and plugged a few and checked others but there is no difference. I'd rather not do the whole de-smog and re-carb thing as I think this could be an easy fix if I could locate the source. My temp. gauge is incorrectly reading hot but this was a problem before that glitch occurred.
Any suggestions would be appreciated. Thanks. gj

 

pull off your EGR valve and see if its clogged up, try plugging all vacuum lines to the carb and see I fit makes a difference.LC makes a new de-smog kit that is everything you need. I,personally would do a de-smog just to get rid of all vacuum issues,just my 2c . oh ,and welcome to yotatech!!!!!!!!!!!!

 

thanks for the suggestion. I will give it a look see...

 

The EGR was not the problem but have not tried plugging lines yet.

 

Smog suck ohh how happy I am without all that crap on my truck get rid.of it if you can

 

I hear ya. But I want to do what is simplest to get it running. The conversion may be down the line...

 

Desmogging is the simplest method - very cost effective and eliminates numerous troubleshooting steps for potential future problems.

 

When I cleaned out the plugged EGR, nothing changed at first. I used the truck to help a friend move recently. I logged about 500 mi and pulled a heavy trailer. Now the idle does 3 things. At first it either idled or did not. Now it will either idle perfectly, not idle at all or run away at almost full throttle. I still have not tried plugging all the vacuum lines.

Any new thoughts with this new running away symptom?? Thanks again.