Question about 1981 Chevrolet Corvette

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How do you check a vacuum controlled cruise control actuator on a 1981 Corvette. Thank you, Ian

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  • 9 Answers

Use a mighty vac, it's a hand held pump. Available at most parts stores

Posted on Oct 27, 2019

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Posted on Jan 02, 2017

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edwardjwoods

Ed Woods

  • 372 Answers

SOURCE: cruise control

Bet switches in steering wheel are bad...Very common. Especially if it has a air bag and the air bag light is on...I would clean the switches or if it has a air bag and the light is on replace the clock spring for the air bag and the light will go off and cruise will work again......

Posted on Jul 31, 2008

SOURCE: cruise control won't work

Does the on light in the dash come on? If not, you may have a broken switch in the steering wheel which is a fairly cheap repair. Otherwise, the controls work through the Printed Circuit Board in your dash (your instrument cluster) and the problem could be as simple as a solder defect or faulty component. The problem is that no Ford Service Technician that I know will touch this and tell you that you need to replace it.

The instrument cluster is very easy to replace but may cost you a few more dollars than you want to spend. I would have someone with an electrical background check the cruise control switches in your steering wheel with a multimeter before going any further with this. Also check the wiring for resistance leading from the switch to the cluster.

Posted on Aug 06, 2008

Anonymous

  • 1 Answer

SOURCE: Cruise control not working

The pump is located on the passenger side of the engine compartment, back by the firewall. Look in the middle of the firewall by the cowl and you'll see a small plastic line going into the cowl. follow it back and you will come to a T fitting. Follow it to the passenger side and it will go into the Vacuum pump that controls the Cruise control.If you follow it to the other side, it goes under the Battery box. this is where the Servo for the cruise is located. Check the lines for small cracks, wear spots or even breaks. The plastic line can get beaten up pretty easily.
The easy way to see if it is your vacuum pump, turn the key on and listen. you will hear 2 distinct sounds. The first sound will stop in about 15 - 20 seconds. (fuel pump?) the second sound is the vacuum pump. If it turns off in 45 seconds to a minute (or slightly longer) the vacuum pump is probably ok, as are the plastic lines. The sound of the pump stopping means that vacuum has been achieved and is holding vacuum. If it keeps running, the pump is bad or the lines have a break in them. If the lines have had a hole in them for a long time, the diaphragm in the pump will have gone south. This is not a servicable part and the pump will have to be replaced. The pump is available from a dodge dealer but most likely the parts guy will not have a clue as there is no picture in their manual and a very poor description. When talking to them ask for a "03 Ram 2500 CUMMINS Cruise vacuum pump"
The part costs $212.70

Posted on Jul 02, 2009

drallim

  • 4088 Answers

SOURCE: check engine light, cruise control light flashing,

Take the car to Autozone or similar business for a free code read with a scanner. Depending on what turns up, they will be happy to sell you any needed parts.

Posted on Dec 26, 2009

Anonymous

  • 5 Answers

SOURCE: cruise control

Try to clean/change the brake switch. The switch is positioned at the brake pedal. On Accord 2003 it can be very easily removed by anti-clockwise rotation of the switch. You can replace the switch with a new one or you can clean the contacts of the old one, since the switch can be dismantled very easily.

Posted on Mar 20, 2010

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Is there a cruise control light on the dash for a 1981 corvette


I do not recall a 1981 corvette with a cruise light.

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The cruise control system is controlled by engine vacuum, like many other engine components. A split in one vacuum line can cause an array of devices to stop functioning properly. A visual inspection is usually the best way to start, but vacuum gauge is the best way to determine if all the lines are receiving proper vacuum. They branch out from the vacuum tree, adjacent to the throttle body. The tree feeds various vacuum controlled devices, boosters, and solenoids. Older vacuum style cruise control systems have a large control actuator which can be tucked away between the engine block and the inner wheel well. Here is an illustration which may help.

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It also doesn't hurt to check the fuse or relay for the cruise control system

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While driving hit resume cruise control and the car speed up to 100 and brakes would not work. Had to shut engine off in middle of freeway, what could it be?


Could be a faulty cruise control servo activator. The power to move the cruise control Actuator is most likely coming from the Brake power hydraulic booster vacuum pipe and if the cruise control vacuum servo is failing and leaking in air you lose the brakes power hydraulics.
check the vacuum pipe coming off the power booster brake master cylinder vacuum pipe you may find a tee connector in the vacuum main pipe and follow it to see where it goes to. Could be a break in the cruise control vacuum hose but if it is only happening when the cruise control is activated a fault or leak in the cruise control servo device is the main suspect. Which you should find at the other end of the cruise control vacuum hose.

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Is there a fuse for the cruise control?


Most cruise controls are vacuum actuated. check for vacuum leaks. This also occurs at the brake petal where cruise is disengaged, check for proper adjustment on the cruise switch.

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How do you fix a cruise control problem on a 2007 Tacoma?


Depends if it is vacuum actuated or electronic. Vacuum actuated, check the hose that runs from the manifold to the controller, make sure there is vacuum, electronic: replace the control module on the actuator.

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1 Answer

Cruise control doesn't work in 2010 pontiac g5


Tricky. If you're unfamiliar with the operation of GM cruise control systems, refer to a qualified GM technician.
Things you can try:
  1. Lubricate the actuator switch;
  2. Lubricate the brake switch (yes, the brake switch is in the circuit);
  3. Lubricate all actuator switches for the cruise control system at the steering wheel;
  4. Check for vacuum leaks, damaged vacuum lines, or other visible problems around the cruise control servo (under the hood).
  5. If your vehicle is equipped with a TRIP COMPUTER, and the trip computer is not updating mileage, replace the SPEED SENSOR.

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1 Answer

Rpm gauge and cruise control do not work 1981 corvette


Instrument Cluster is going bad.

I do not beleive the 1981 Vette is Electrical STEPPER MOTORS but simply gets feedback from the Coil

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1 Answer

How to fix the cruise control - won't hold speed!


Could be the problem; however it is more likely to be under the hood where the cruise actuator is located - check the electrical connections on the actuator and the linkage between the actuator and the accelerator lever on the engine. Also, if the cruise control uses a diaphragm to control the accelerator, it may be leaking or the vacuum line to it may have fallen off - check the vacuum at the actuator with the engine running.

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Where is the fuse for cruise control in a buick century and what are some reasons cruise control may not work?


Need to know what year the car is and what engine, it makes a difference. Possible causes could be a fuse, cruise ECU, vacuum line(if vacuum actuated), cruise servo(if electronically actuated), cruise switch, wiring, cruise cable. There are lots of possibilities, but if you can tell me the year and engine size that will help.

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1 Answer

I need the specs for a 1990 mazda protege cruise control unit....it is no longer working trying to fix.


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Mazda vehicles used both vacuum actuated and electric stepper motor type cruise control systems. The actuator, located in the engine compartment, will have a vacuum line and electrical wires connected to it if it is a vacuum model. Electric stepper motor type units will have no vacuum line connected to the actuator.


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