Hello! As many of you probably know, the fuses can be tricky with these older volvo's. A good trick is to clean the fuse box with a wire brush, and put dielectric grease on the fuses!

Before I learned that trick, i struggled with the fuses a lot on my 1984 Volvo 244 GL, and I think I may have messed up the cruise control. When I set the speed for my cruise control, the car instantly starts accelerating out of control. I have let it go up to 90 mph before and it just never hits a peak. I've tried coast, resume, turning it on and off, I've put brand new fuses in several times since. It will always just keep accelerating.

Any ideas on how to fix this? Could it be a bad relay, or does it just need to be reprogrammed? Do you think a Volvo dealer might fix this for free? It is kind of a safety hazard.

Thanks for any info!

 

Anybody have any info on this??

 

any warranty on a 28 year old car is long expired

the cruise control throttle actuator is a vacuum operated thing right next to the gas pedal, it pulls the pedal in with a short cable. on our 1987 240, that cable is rusted completely away and gone. yours might just be binding.

according to the wiring diagram for a 1984 240, the cruise control servo is over on the right side of the engine compartment, between the strut tower and the firewall somewhere, kinda like a can with a hose out of one end (that goes to the throttle actuator I described) and various wires. the electronics control unit is behind the dashboard under/behind the glovebox. there's a speed pickup connected to the speedometer in the dashboard.

the only fuse remotely involved is the one for the brake lights, fuse 6. if the brake lights light up, its supposed to shut off the cruise immediately.

if you want my guess, its not seeing the speed correctly, so it keeps accelerating.