1) Check with your dealer, there should be an update (flash) for the body control module and/or
2) Change oil & filter.
Normal cause is a failed TPS. (throttle position sensor)
Overdrive is the normal position - if you are in hilly areas and find the transmission keeps shifting back and forth between overdrive and drive , you can use the overdrive cancel switch to shut off the overdrive feature and if you are towing something you also want to shut off the overdrive
On a 1999 Ford Expedition : Overdrive is the normally allowed position It won't shift into overdrive ( the 4th " gear " of the transmission ) until the speed is higher anyway ( such as on a highway / freeway ) If you are towing something / or driving in hilly country and the transmission is shifting back and forth between overdrive and drive , then you want to shut off the overdrive on the transmission using the switch on the end of the gear selector lever . ( the word OFF will light up near the end of the gear selector lever )
is this a manual box with the button on the top of the stick to get 5 st overdrive gear drive in forth up to 40 mph then press the button overdrive light green light now on press to come out of overdrive or change down a gear to third.
You should put in into overdrive at all times unless your pulling something and the transmission shifts back and forth then just use drive so you wont damage the transmission
Normally the O/D OFF light is not lit up , this allows the transmission to shift into overdrive ( the 4th gear of the automatic transmission if the vehicle speed is fast enough such as on a highway / freeway ) If you want the transmission to only use the first 3 gears and prevent shifting back and forth between overdrive and drive such as on hilly terrain select the Overdrive / Off ( O/D OFF ) position
You can leave it engaged all the time if you wish - it will shift into, and out of, overdrive mode when necessary. HOWEVER, if you do a LOT of driving in the 35 - 45 MPH speed range - to prevent the overdrive from "hunting" back and forth, you can disengage it in that kind of traffic.
On a 1996 Ford Explorer : Overdrive is the normally allowed position It won't shift into overdrive until the speed is greater anyway ( such as on the highway or freeway , my 1995 Explorer XLT doesn't shift into overdrive until I'm going 50 MPH / 80 KPH ) If you are towing something , or if you are driving in hilly country where the transmission is constantly shifting back and forth from overdrive to drive , then you want to shut the overdrive off using the transmission control switch on the end of your gear selector leaver ( P R N etcetera ) and the O/D OFF light will light up in your dash
According to the 1995 Tracer's Owner Guide (page 241): Overdrive is the usual driving position for an automatic overdrive transaxle(transmission). It works the same way D (Drive) works, AUTOMATICALLY upshifting or downshifting as the vehicle speeds or slows. However, Overdrive also shifts into a fourth gear (an overdrive gear) when your vehicle cruises at a consistent speed for any length of time (like on the Interstate). Overdrive will increase your fuel economy when you are traveling at cruise speeds (usually 50mph or higher). But, Overdrive may not be appropriate for certain terrain such as hilly or mountainous roads because the transaxle (transmission) automatically shifts back and forth between 3rd and 4th gears while doing this type of driving. Therefore, it is recommended if your car is continously climbing hills/mountains (which requires additional power) then you should shift to D (Drive).
Assuming that's Fort Polk in Louisiana, it will take you between 6 and 7 hours to drive there from San Antonio.
Most people simply leave the overdrive function "on" all the time. However, you may want to dis-engage it if operating under rough terrain conditions or in rough weather (ice & snow) conditions, or when pulling or towing something. Some people leave it dis-engaged if they do a lot of constant driving in the 35 to 45 mph range to keep it from "hunting" back and forth between high gear and overdrive.
I would like to add that if you drive in the 40 to 50 mph range, don't use overdrive. The transmission will shift back and forth too much eventually causing problems with the transmission and drive train. If you have a shift indicator that has both the letters D and 3, use 3 in this type of speed range. D usually indicates a higher or highway gear setting. When cruising on a 4 lane highway, the transmission does not have to shift very often.