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My cruise control will kick off when I try to set it.

(1994 Buick Park Avenue)
in Pierre, SD on March 06, 2013
I have replaced the servo, the computer, the brake switch and checked all the vacuum lines for leaks. It will work sometimes and then it will kick it off and I have to turn the car off and start it again before it will work again.
Displaying 2 answers & 3 comments
Popular Answer
on March 06, 2013
I was also having a similar or identical issue with my cruse control. Recently I took time to read what it says in the original owners manual (which I found on line) for my GM car (I own a 1994 Pontiac Firebird with a 3.4 V6, same motor, different bore). My car probably has the exact same or close to the same CC unit as your GM car. I discovered by reading my manual that I was actually operating my CC improperly. I should also say that operating it improperly used to work for me but stopped working a couple years ago. The method I was using (which stopped working) was to just turn the CC on by sliding the OFF ON R/A slider switch all the way over to the right. Then releasing it when I reached the desired speed. Mine wont operate that way anymore but... I tried the method laid out in my manual and it works perfectly. Here's how GM says to operate it...1) When you're ready to use the cruise control..move the "OFF ON R/A" slider switch on your turn signal lever to the "On" position. 2) Then, use your gas pedal (not the Off ON R/A slider) to achieve your desired cruising speed. 3) Then push the "SET" BUTTON the the extreme TIP (or END) of your turn signal lever for 1 second and release it. 4) Take your foot off of the gas pedal. That should make the CC work. If this is unclear, read what it says/ look at the diagrams at this link below on pages 72-75. I discovered much more cool and helpful information about my cruise control system by reading the entire section. For example...did you know you can reduce your set cruising speed by 1.5MPH increments, without resetting your cruise control, just by pushing that "SET" button again for 1 second and releasing it....? I always thought the only way to set a CC to a SLOWER speed was to turn it off and reset it altogether.
I hope this helps. I have bad feet and know how important is can be to have a working cruise control. I use mine at every possible opportunity.

If it still doesn't work I'd look for vacuum leaks in the PCV system. Make sure the PCV Valve's fin is pushed all the way so it's snapped into the grove in the PCV Valve Grommet. There's also the option of getting your codes read/engine scanned but I know it's not all that easy for 1994 GM cars because it was a transition year for GM on board diagnostics systems.

on March 06, 2013
Finally, someone who actually read the owners manual! Thank you. I have repaired many a vehicle simply because people dont even take the book out of the glove box and READ. Now that may not fix this problem but it sure aint going to hurt anything to look.
Any seasoned mechanic will tell you they refer to that manual lots of times while doing repair work, if they are honest! I do becsuse there is info. in it that you cant get anywhere else. Why people never consult that handy little book i will never know. Dont use that old excuse i dont have one, GET ONE!!!! It is just a smart thing to do and you just proved it. Way to go!
on March 07, 2013
Thanks for saying that. Unfortunately for most people it's usually a lesson hard learned. Like me for example... It took me about 3-4 years of frustration before I found the manual and read what it says about my cruise control. I hope it also helps Demmit who's put so much more then I did trying to make that CC system work. I've also found lots of useful tips doing a Google search then reading other people's conversations on these type of websites. The biggest problem I've seen is so few people come back to the site to report what finally resolved their issues. If people would take a minute to report back with their final solution it would save lots of others from having to ask the same questions over and over. Sorry, didn't mean to tread on Demmit's thread. CHEERS
on August 14, 2013
my cruise controll will shut off while I am goimng down the road and not turn back on until I restart the car.
on August 14, 2013
Depending on the year of your car, I'd look at the wiring. I was getting some strange symptoms from my '94 Firebird. Turns out that most of it was dirty/corroded wiring connectors. My car is 19 years old though, stored outside, and in the Seattle area. Anywhere though...., these 4th Generation F-Bodys have engines that sit directly under a 2-piece cowling rain/car-wash gutter. A few leaves and/or pine needles etc will force water directly onto the Multipack Fuel Injector Connector, and/or at least will drip directly on the Fuel Rail. (That's if you have a V6 SFI). That cowling rain/car-wash gutter also empties out right next to the PCM. I found 1/2 gallon of needles, dirt, and water underneath my PCM. I ended up going through and cleaning all of my ground ties, PCM connectors, and all the major engine/sensor plugs and connectors I could get too (both male and female). I used that CD Electronics Cleaner (and a wire brush on the ground ties). They needed it and this worked really well for me. I'd also consult the Manufacturer's Maintenance Manual. You can download those free online
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