The vehicle’s computer actuates the three solenoids, allowing leakage to vary the level of vacuum, thereby keeping the throttle at just the right level. The unit is a vacuum enclosure where a throttle wire connects to a rubber diaphragm and adjust engine speed as the diaphragm moves. ![]() ![]() But we’re still satisfied because he gives us a look at the system which uses the amber-colored stoppers on the three solenoids to plug three different sizes of weep holes. It’s been on the fritz for ten years and this piece may not even be the culprit. We categorized this as a repair hack, but is just rubbernecking and doesn’t have any real plan to fix the system. The parts seen in the image above make up the throttle control, using a trio of solenoids to vary the level of vacuum inside the device. ![]() We were a bit surprised at how the system operates. ![]() Took a look inside the business end of the cruise control system from his 1994 Jeep Grand Cherokee.
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