I have a 1994 toyota paseo, with automatic transmission with overdrive. When i take it out on the highway, it takes some time to go into overdrive. I would be doing about 60 mph with the rpm up high. It takes sometime to go up to overdrive, and then the rpm would come back down low. At this time the car would be running normal at the speed of 65 mph at a low rpm. Also, at around the same time i have no heat, just cold air blowing out of the vents.The temp. gauge on the dashboard has a very low reading, once in a while the temp. will come up, then go back down to the lowest reading on the gauge. Does this problem have to do with my overdrive problem?
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Re: 1994 toyota paseo: overdrive problem
Does it loose heat when you set still? is it full of coolent? whats the climent like were you at? is trans. low on fluid?when was the last time trans. was serviced? i know on most cars and trucks low fluid or old fluid can cause it to do what your saying, and also cold weather. some cars have a temp.sensor that won't let it shift into overdrive until car gets to a certain temp. with your temp. guage fluctuating the two could be related. has your service engine light ever come on and then went out, when it did this? if it ever has, have it scaned and see what codes show up. it might be that temp sensor i talked about. well thats the best i can do for you RON hope it helps or at least point you in the right direction to cure your problem. OLD SCHOOL.
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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).
Hello. My name is Toyota Ed. Please allow me to assist you.
The truth is, your Paseo is working properly.
To lessen emissions, Toyota does not allow the overdrive to engage until the engine temperature reaches 177 degrees F.
The "OD allowed" temperature is determined by the coolant temperature sensor on the engine. This sensor prevents the computer from allowing the OD to engage until the 177 degree threshold is met.The warmer the coolant is, like in the summer, the faster the 177 degree plateau is reached. In colder temps, like in winter, it takes much longer for the coolant to warm up to the desired temperature, thusly taking longer to shift into OD.
If the overdrive engaged before 177, cold-engine emissions are more abundant.
There is nothing that can be done to change the point at when the OD is permitted to shift.
So, your car is in excellent working condition. Nothing to worry about, now that you understand the basic design.
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TURN OFF RADIO SO YOU WONT LOSE CODE.DISCONNECT NEGATIVE BATTERY CABLE.THEN REMOVE POSITIVE BATTERY CABLE.AT BATTERY THEN REMOVE POSITIVE BATTERY AT STARTER.YOU WILL HAVE TO REMOVE AIR CLEANER ASSEMBLY TO GAIN ACCESS TO STARTER.IF YOU HAVE AUTOMATIC TRANSMISSION YOU WILL HAVE TO DISCONNECT THE THROTTLE LINKAGE CONNECTING ROD AND TRANSMISSION OIL FILLER TUBE.
According to Haynes Auto Repair Manual, section on automatic transmissions, the 1994 Towncar has the AODE transmission
Baumann Electronic Controls website
The Automatic Overdrive (AOD) transmission was introduced in 1980 as Ford's first four-speed automatic overdrive transmission.
The AOD-E transmission is essentially a beefed-up electronically-controlled version of the AOD.
If this doesn't answer your question, you might troll around the website.
the overdrive button on your automatic transmission is for cruising on the highway basically like having another gear for better economy careful not to use it when your not on the highway because lugging the car in overdrive when its not needed will cause higher fuel consumption other than that you should have no problems just get out on the highway and push and away you go
I would start with replacing your tranny fluid. black is no good. your tranny should hold about 7 qts of fluid. The tranny fluid runs through your radiator to help keep it cool. If your thermostat is stuck closed your eng coolant won't circulate and the coolant will get hotter inside your radiator. thus making your tranny fluid hotter and breaking it down. After time it will turn black from getting too hot. Let your car warm up to normal operating temperture then grab your upper radiator hose. It should be very warm. If not your thermostat is stuck closed.
Use it only on highways and you should wait until you are in 4th gear to turn it on. If used in a moutain area, it will put more strain on the transmission so make sure it is not on while going up hill.
Your light for the overdrive is probably flashing from the transmission shifting in and out of overdrive? But to your power problem,It could be your catayliticconvertor. You should have a check engine light on with a fault code associated with it.Manuf are all different but it should say, Cat efficiency below minimum which comes from the rear oxygen sensor. The only way for you to check would be to drop the exhaust forward of the cat and then drive the car around the block to see if the power returns. Sometimes if you take a rubber hammer and hit the Cat you can hear the broken material inside jumping up and down. One thing I would check first before replacing it is by govt standard it is warrantied up to 80k. call the dealer and run your VIN number they can tell you if it is still under warranty. Even if the car is not.Hope that helps..Mark