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Do you drive a lot, and often at the same speed? I had a long commute with no traffic and did this for years, and started getting a stutter/hesitation at a certain speed. I realized that it didn't happen if I changed my cruising speed slightly. It turned out that my throttle position sensor had gotten a worn spot in it from being at the same place all the time. I changed it out and the problem vanished. Just something to consider.
There are many things that can cause your cruise control to act up or not work at all. This article will lead you in the correct direction on finding a solution to your problem. This article is for any type of vehicle.<br />
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<b>If your cruise control won't hold proper speed, </b>you need to look at the following parts. <br />
<ol>
<li>Faulty Cruise Control</li>
<li>Faulty Speed Sensor</li>
<li>Faulty Vacuum or Vent Valve</li>
<li>Faulty Stepper Motor</li>
<li>Faulty Transducer</li>
<li>Incorrect Cable Adjustment</li>
<li>A Binding Throttle Linkage</li>
<li>Leaking Vacuum Tank</li>
<li>Leaking Vacuum servo diagram</li></ol>
<b>If your cruise control surges, </b>check the following parts.<br />
<ol>
<li>Faulty Cruise Control Module</li>
<li>Faulty Speed Sensor</li>
<li>Binding Throttle Linkage</li>
<li>Kinked Speedometer Cable</li></ol>
<b>If your cruise control cuts out on you, </b>check the following parts.<br />
<ol>
<li>Faulty Transducer</li>
<li>Faulty Cruise Control Module</li>
<li>Short or Open Circuit in Cruise Control</li>
<li>Brake or Clutch Switch Adjusted too tight</li></ol>
<b>If your cruise control doesn't work at all, </b>check these parts.<br />
<ol>
<li>Faulty Cruise Control Module</li>
<li>Short or Open Circuit in Cruise Control</li>
<li>Faulty Clutch or Brake Switch</li>
<li>Leaking Vacuum Circuit</li>
<li>Faulty Stepper Motor</li>
<li>Faulty Speed Sensor</li>
<li>Faulty Transducer</li>
<li>Faulty Cruise Control Switch</li>
<li>A Blown Fuse</li></ol>
cruise controls are dependent on the following sensors all working together
brake sensor
clutch sensor
auto--vehicle speed sensor
rpm's sensor
fuse for the cruise control
cruise control switch either or all not working will stop the cruise control from engaging
road speed at which you can engage the cruise control has to be above a reset speed before it will cut in and work
cruise controls are controlled by several units
VSS or road speed sensor, clutch and brake sensors , engine speed (tacho) and the on/off switch
cruise controls will disengage automatically if the road speed is too slow ( higher for manuals than autos ) so if the road speed is below around 20mph it may not engage at all as the VSS says it is too slow for the engine rpms
check all sensors for adjustment
First I'll assume you haven't read the owners Manuel, Cruise control is not perfect on any vehicle. if coming to a hill put foot on gas to help rpm, going down hill put foot on brake to keep same speed, cruise control operates off of engine vacuum. Speed sensors can be affected by putting on smaller or bigger tires than what is on drivers door.
Take your car in to have your check engine light code read. Most car parts dealers will do this for free. A possibility is you speed sensor on your transmission is going out.
I suspect TPS (Throttle Positioning Switch) they're basically a rheostat that controls throttle movement. After a while, spots that get most used develop "Hot Spots" - and will cause a surge or hesitation when at that location. Replace TPS.
there are 2 possible parts here, one is a transmission speed sensor, this part tells the cruise what speed u set and keep it there, the other is the the actual actuator that holds the throttle at the right position to maintain set speed, other less common issue's make sure the brake and clutch (if manual trans only) cruise cut off switche's are ok
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