Over 70 mph and overdrive turns off - 1996 Mazda Protege

70 mph at 3000 rpm - Ford Explorer and Ranger Forums "Serious ...

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May 13, 2003 - 19 posts - ‎14 authors
Elite Explorer members can change the forum "styles" to eliminate most ads, including the blue underlined links, and no ads on photos. Are my "rpms" too high?
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Feb 8, 2010
2003 Explorer Transmission solenoid and overdrive servo
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Why is my car running at 3000 rpm? ' Yahoo Answers

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Jan 28, 2010 - Most days when I am just cruising along at 65-70 mph my engine is at about ... However, some days it will be at 3000 rpm while only going 60-65 mph, ...into overdrive. it wont hurt your engine running that high, but you will get ... Why does my car run at 3000 RPMs going 70mph?
Dec 15, 2011
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By default, your automatic transmission has a torque converter that is the main focus to your car\truck changing gears. I had one break on me in a Nissan Sentra and was glad I was close to where I was going because I would have otherwise been stranded.

If you live in a mountainous area and do a lot of traveling going up and down hills, your best bet, as long as you are above 58 mph(like going thru Denver on Interstate 70 and going west thru the Rockies, then it is okay to leave the overdrive on. I would, however, recommend that going up an incline of more than 30* then you may want to turn it off until you have reached a sustainable speed. If you are towing more than 800 lbs on a trailer on an incline of more than 20* then you would want to turn the overdrive off as the torque converter putting your vehicle into overdrive with a heavy load can cause the converter to snap within the transmission and you would be dead in the water.

If you live in a more plain-like state then the only time you really NEED to turn off the overdrive is if you are hauling a large amount of cargo any real distance or rarely get over 4300 rpm due to such short traveling distances. Overdrive function is primarily used to cut down on the amount of fuel needed in order to take long journey on Interstate or State highways that allow for speeds faster than 55 mph.
Hope this helps.

Have the knock sensor replaced and see if this rectifies the problem

Over Drive..... Generally speaking, overdrive (OD) is the highest gear in the transmission. Overdrive allows the engine to operate at a lower rpm for a given road speed. This allows the vehicle to achieve better fuel efficiency, and often quieter operation on the highway. When it is switched on, an automatic transmission can shift into overdrive mode after a certain speed is reached (usually 70+ km/h [43+ mph] depending on the load). When it is off, the automatic transmission shifting is limited to the lower gears. For an automatic transmission, it is almost always best to select overdrive and allow the transmission to control engagement of the overdrive. (It may be necessary to switch it off if the vehicle is being operated in a mountainous area or when towing a trailer.) With a manual transmission, overdrive should usually be selected when the average speed is above 70 km/h (approx. 43 mph).

I had a similar problem with my truck. It eventually go worse and I lost reverse. I had to have the transmission worked on.

if you had 4:10 gears in the rear axle maybe. but i,d say your over drive is out. your truck should be running at about 2100 rpms or a little less at 70.

The overdrive circuit is is faulty and will have to be replaced or short in the wiring .

As a response to solution #1 these cars do have an overdrive while in D-4, mine was shifting in and out at 70 mph until it finally quit and the rpm is now 3100 at 70 mph insted of 2700. The car still shifts 4 full times just not the fifth-OD. I still can't find out what fixes this problem either.

You need to have it scanned. The od off light is like the check engine light for the transmission. It will flash when you have transmission codes.

There is an overdrive fuse in the fuse compartment on the drivers side door panel, check and see if its blown, if it is there was some problems with the overdrive shift wire touches the bottom of the tranny pan, and can cause the fuse to blow out.