Automatic transmission Hi, my son removed vaccum leads for what ever reason to the transmission control. The car now won't change properly and holds second gear, only changing at 50kph. Do you have a hose diagram for the vaccum control?

This may be a faulty transmission control solenoid. As you know, automatic transmissions use pressurized hydraulic fluid to change gears. ... When this is faulty or not working properly, this can cause a delay in gear shifting or in some cases cause the car to not shift at all.

https://www.yourmechanic.com/question/my-car-won-t-shift-gears-and-revs-really-high-by-vilma

Hi, since you use a dextron type 2 automatic fluid then it is not cause of the sticking gear. Rather it should be as a result of a clogged transmission filter. A clogged transmission filtercan cause problems with changing gears because it will not allow the fluid to pass through the valve body or valve solenoids at the proper pressure. Without pressure, the plates won't move properly and you won't be able to easily change gears. This can be symptomatic either by itself or along with burnt or worn out transmission fluid, and both should generally be replaced at the same time, rather than just replacing one or the other.

The splines in the torque converter are stripped, very common problem back in the day.Transmission will need to be removed and torque coverter replaced. rebuilt converter should run about 150 to 200 plus labor and some fluid.

Hi!

The torque converter Clutch solenoid is responsible to hold the pressure when you put your foot on the brakes and that's why automatic transmission don't let the car stall at a stop sign. So you might check the transmission oil for the proper level and hopefully you wont need to change the torque converter clutch Solenoid. Good luck

yes, change the filter and use proper fluid and level. filter might not be a stocking item at parts store. After you changed, pull negative battery term overnight to reset trans logic memory. May also be servo pack if it has one (does it make a short buzzing sound when going into gear?) they get clogged too as in a Chrysler transmission.

you should never need to change the transmission oil on a automatic .have no idea why it went wrong but i would i would fit a manual gearbox ,

HI. I would inspect the transmission fluid level, asap. This is the first issue that may cause this no shift. Low fluid level can damage the gear assembly, if it is not at a optimal level. If the fluid is at an acceptable level, this will lead to a failed shift solenoid. These devices are located inside the transmission, mounted on the valve body. You will need to remove the transmission pan, in order to, expose the shift solenoid. there are three(control,kickdown,OD). The solenoid at question, will be your control solenoid(shift). This damaged device will need to be tested for proper Resistance, or continuity. A multimeter can be used for testing. Each solenoid is equipped with two terminals. use these terminals for testing. This will , also, require you to drain all the transmission fluid, as well.


NOTE_ If you are uncomfortable with disassembling the transmission, i would suggest to contact your local mechanic for this inspection, and repair.

hi

it seems that the gear bushings have worn out. you need to take your car to a mechanic to have the bushings changed. Also, please check it your car has enough Automatic Transmission Fluid.

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RAhUL_hunk

Ya but if nissan planted filter's in there tansmission's then they would grow,right?NISSAN does not install filter's in the tran's.It is a permanent screen and luckily for people all I have to do is undo the plug from the pan and drain while hot, screw the screw the plug back in and funnel your new fluid back in to the tran from the dip stick tube(my 04 sentra 1.8s 4speed automatic takes 5 quart's but holds 6-type D nissan fluid from dealer,change about every 15 to 20 thousand miles to keep it clean and thin.Remember trans fluid is petroleum and get's hot burn's and thicken's making restriction's on rotating metal).My car has over 90,000miles and shift's perfect

How to prevent the transmission from damage
(The filter usually is screen type and can be cleaned when remove bottom cover. but this is not to be done at regular maintenance inspection.)
- Regularly check your parking space for leaks. Doesn't matter, is it the engine oil leak, power steering fluid or transmission fluid; if you discover any, get it fixed before it caused something serious.
- Once in a while check the transmission fluid level and condition. Not all cars however have the automatic transmission dipstick, in some cars, for example, in late Volkswagen models, the transmission fluid can only be checked by the dealer. Consult with your owner's manual for details. If the transmission fluid level is too low, there is a leak somewhere that needs to be fixed.
- Change the fluid as often as it said in your owner's manual or when it becomes too dark (rather brown than red) or dirty.
Also, keep in mind that an automatic transmission can not be drained completely - there is always some transmission fluid left inside the transmission (the torque converter, in the valve body, etc.) which means you only can change about %60 of the fluid at once. This is one more reason to change it more often.

- Use only the same type of the transmission fluid as specified in the owner's manual or on the dipstick. Some vehicles (e.g Dodge Caravan) are very sensitive to fluid type
- Never shift to the Reverse or Parking until the car comes to a complete stop.
- Never shift from the Parking mode when engine rpm is higher than normal idle.
- Always hold a brakes down when shifting from Parking.
- The automatic transmission can be damaged if towing with the drive wheels on the road. Always use a dolly or place powered wheels on the towing platform (if the vehicle is front wheel drive - tow it from the front leaving rear wheels on the road.
the filter