why does the 1991 Lincoln towncars transmission not have overdrive?Instead of going into overdrive it seems to go into neutral.But if you take it out of overdrive and leave it in drive it never goes into neutral while I'm driving.
Could be low fluid,a bad sensor or transmission going bad.
There are many possible meanings to the word overdrive. Many people use the word overdrive to mean going beyond normal. As far as automotive terms go, overdrive simply means that the transmission output shaft spins at a faster rate than the input shaft. So, for example, if a transmission had a .70 overdrive ratio, then the transmission output would spin one full turn for every .70 turns of the input shaft.
if their is no slipping or any other transmission issues and it is just only the loss of overdrive try replacing the brake light switch
Overdrive is for highway driving, which is great for gas mileage. Also, not to use overdrive when going up or down hills because it makes your transmission work harder. That's what I was told anyways.
The transmission is on its way out.You could drive the vehicle with the overdrive function turned off to buy some time.
The overdrive should be switched off when you want to avoid unneccessary shifting. If you are driving on a hilly road, the vehicle will shift out of overdrive going uphill to maintain speed while pulling the vehicles weight up the hill, and shift into overdrive going down the hill to save fuel when additional engine power is not needed. When towing with an automatic transmission, the vehicle may tend to repeatedly shift in and out of overdrive due to the added weight. In scenerios such as these, you should turn off the overdrive to avoid the unneccesary shifting which puts more wear and tear on the transmission.
Overdrive relay switch behind the middle air vents..... Manual Transmission: the wires sometimes break if it is the type with the button on the gear/knob/ stick........... if it is a manual transmission.......the switch on the gearbox which tells when 4th gear is engaged can be faulty.....and will not allow the overdrive to engaged.
Answeri had the same problem of transmission not going into overdrive.i changed my thermostat and it works fine now.give it a try .
Overdrive is the normally allowed position ( unless you are going fast enough it won't shift into overdrive anyway , mine happens to shift into overdrive approximately 50 miles per hour / 80 kilometers per hour with my four speed automatic transmission if I'm cruising )
mass air flow sensor
on the back of the drivers side head. it has an ign, gnd, and data wire going to it
Overdrive is the normally allowed position . It won't shift into overdrive until the speed is fast enough anyway , but if you are going up and down hills and the transmission keeps downshifting you might as well turn the overdrive feature off until you are out of the hills Just adding to the answer : Also if you are towing something you want to shut off the overdrive
If you don't want the transmission to shift into overdrive ( such as when towing a trailer , or driving in hilly country where the transmission is constantly shifting between drive and overdrive ) push the button on the end of the gearsfift selector ( P R N etcetera ) and the O/D OFF light will appear in your dash . Overdrive is the normally allowed position , but on my 1995 Ford Explorer doesn't shift into overdrive until I'm going around 50 Miles Per Hour
This can be caused by anything from a bad sensor to transmission going bad. A transmission mechanic can check for engine codes and other tests to verify if it is a simple fix or major repair.
AnswerThe clutch is worn out or needs adjustment.Or, you are just not utilizing the button under the shifter knob, that releases the transmission out of overdrive. You will find that the transmission will keep up with the RPM's if it is not in overdrive.EDIT: There is no overdrive button for a manual tranny, that's what the 5th gear is for. If the RPMS are going up and the speed isn't, it's time to have your clutch examined.
trannies are tricky and should be handled by the transmission pro's..... but your problems of it not going into reverse might be from the low fluid levels.... it may be a minor repair right now but don't leave it too long before the pro's get to see it....
on our van it was the vechicle variable speed sensor. On mine it was the 1st sign of Transmission going out and $3000 repair
take it to parts America have them read the codes that's begining signs of a vss vehicle speed sensor going , or tr sensor transmission range sensor
The only reason not to leave it in overdrive would be if you are towing and going uphill. The car's computer will tell the transmission when to shift safely, but when under a very heavy load it may shift a lot. I usually only take overdrive off when I am towing going up hills where the grade changes frequently. If you are unsure, then it is better to keep it in overdrive all of the time and let the computer do the calculating. Fords actually have a pretty good system in place to remember how you drive so the computer will make the ride most comfortable.
On fuel rail under intake plenum almost in center of engine if you reach behind plenum you can feel the vacuum hose going to it
Sounds like a transmission problem when going into overdrive.
Yes!! unless you want lower gas mileage, and excessive wear on your engine and transmission..only take the Overdrive off if you are in a low traction situation...snow, ice, of off road terrain. Im the same person who left the answer to "programming keyless remotes on a '94 pathfinder"...im not registering for this damned page but i will be of any help i can to fellow Nissan "Pathy" owners..e-mail me at Libertarian@awnwindow.com...and if you happen to be a hot chick definatly e-mail about your pathfinder It is a good idea to turn it off while towing ,, any automatic i drive with o/d seems to get MUCH better gas milage when just in drive if you're on back roads or going up hills. Maily because you don't have to put your foot into the pedal more to get it to kick out of overdrive once you already started losing speed going up a hill. i was getting 20mpg on an 87 IROC with 350 and auto tranny because of this method.
Overdrive is the normally allowed position , but unless you are going fast enough it will not shift into overdrive because it acts as the " top " gear ( on my Explorer I have to be going 50 miles per hour / 80 kilometers per hour before it shifts into overdrive )