Cruise Control Problems of Mazda RX8

I was driving on the hwy, the cruise control was on, I had been using it for about 20 miles, occasionally bumping the speed up or down as conditions permitted. My primary reason for that is on long trips I get better gas mileage that way. The divided highway came to an end and there was a traffic light about a half mile ahead, so I bumped it down about 2 mph, then bumped it down a few seconds later another 2 or 3 mph. The light turned red then, so I stepped on the brakes (doing about 65 at this point). The engine reved up, the cruise control did not disengage so I stepped on the clutch. The engine continued to rev up so I pressed the cancel button on the steering wheel. The engine continued to rev up (about 6k now) so I took the car out of gear and turned the cruise contol off. The engine continued to rev up (about 7k now) and I'm completely stopped at the light. No throttle control at all. I shut the car off at that point. When the light turned green the car started fine and ran normally.

See all problems of the 2009 Mazda RX8 🔎.

The contact owns a 2004 Mazda Rx8. The contact states that while driving with cruise control set and hitting the brakes to slow down or stop , and if pressing the resume button ,the car will actually set itself 5 mph more than what originally had the speed set for. Once the car goes to 5 mph over the speed the car was set for the car will act as if it was trying to make itself go back down to the speed that was originally set ,and the vehicle will jerk violently. The contact was taking the vehicle to the dealership on Thursday to see if they could diagnose the problem because this has been occurring for a couple of months. The only way to make this problem stop is to turn off the cruise control and reset it and then it will stop. This problem with the vehicle at highway speeds will happen at about 60% of the time that the cruise control is set. Also, the engine fan will stay on all the time. The dealership is unable to duplicate the problem. Therefore , it cannot be fixed at this time. The electric fan will actually stay on while the vehicle is turned off. Then by turning the ignition back on and off it the vehicle will stop running. This mostly occurs if the vehicle is driven for about 30 minutes.

See all problems of the 2004 Mazda RX8 🔎.