Help Me ID this part. -
  • 1 Post By John Strenk
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post #1 of 7 Old 07-09-2020, 06:10 PM Thread Starter
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Help Me ID this part.

Thanks in advance.

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post #2 of 7 Old 07-09-2020, 08:29 PM
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1980 CJ5 
Join Date: Feb 2019
Location: Duluth
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part of the cruise control system. Stepper motor to act on throttle?

I only need the tools that I can't find.
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post #3 of 7 Old 07-09-2020, 09:36 PM
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1974 CJ6 
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Sol-Vac or anti-diesel solenoid. Opens the throttle after you turn off the key to keep it from having a run on issue.

80 CJ-5, 74 CJ-6, 56 CJ-5
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post #4 of 7 Old 07-09-2020, 10:30 PM
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1981 CJ7 
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Idle Stop Solenoid, known by its marketing name of Sole-Vac or Throttle Positioner.

It has a vacuum actuator, a closed throttle switch and a holding solenoid which can maintain throttle position. Teh vacuum actuator is controlled by a vacuum line from the idle solenoid on top of the valve cover, one of those three in your photos and fully extends the device. The holding solenoid is electrical.

It works in two modes.

Firstly the vaccuum actuator receives vacuum from the idle solenoid which is operated by the idle relay which is controlled by the MCU to raise the idle speed during starting. When you turn the key to Run and Start the MCU will extend the Solevac to full out for a period of 60 seconds during engine start up to meet 1100 rpm and then retract it.

Secondly if you have aircon the idle speed is raised to 900 rpm when the A/C is on by the holding solenoid.

It is not an anti-diesel device and as far as I am aware is not energised during engine shut down.

Tune up settings for a manual transmission (auto are lower) are:

Curb Idle Speed 680 rpm
Holding Solenoid engaged 900 rpm
Vaccuum actuator energised 1100 rpm

Why do you need it? If you do not have A/C then its working or not does not effect the driving of the CJ. Its introduction with the MCU must be related to emissions in the early start up.

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post #5 of 7 Old 07-09-2020, 11:39 PM Thread Starter
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Thanks guys. I don't have AC, and am planning on installing a rebuilt carb. I wasn't sure if it need to be hooked up or not if I go with the non-feedback carb.
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post #6 of 7 Old 07-10-2020, 06:39 AM
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1956 CJ5 
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Hi, Both bagusjeep and Fourtrail are right . Only Fourtrail is a little wrong it does not hold the throttle open when you turn the key off it lets the throttle close when turning off to stop run on (dieseling). It was mostly used on AC car/trucks with automatics to increase the idle when the AC was on so when stopped at a light the motor won't die due to the extra load of the AC on the motor making a lower idle.
With no AC you most likely don't need it..
good luck
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post #7 of 7 Old 07-10-2020, 09:53 AM
John Strenk
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1976 CJ5 
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It also kicked the throttle open a little when the manifold heater was activated.
There might be one more thing also but if you are not running the computer, itís not doing anything.

It could be rewired to kick up your RPM when using a winch or something.
So donít throw it away.
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