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Darko

240z automatic / shifting issues

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Hello, 

I have 240z with 3 speed automatic transmission  and I cannot get it into the second gear, it skips the second gear and when it reaches speed for the third gear engages the third gear !

I decided to buy the overhaul kit and replaced all clutches and everything but still the same problem persists !

Maybe the problem could be with shift solenoid, there is one electrical solenoid and next to it is the vacuum one. 

If I get vacuum off it it loses the third gear and there is no electricity on the electrical solenoid when I measure it ! Should there be 12 volts on it when I start the engine 

Has anybody had issues with the second gear not engaging ?

I am from Bosnia and there are no parts or any of these vehicles 

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I know very little about the 3 speeds but I would definitely looking at the solenoids.  Isn't there an FSM for the 3 speed somewhere?

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3 hours ago, Patcon said:

I know very little about the 3 speeds but I would definitely looking at the solenoids.  Isn't there an FSM for the 3 speed somewhere?

Thank you for the  FSM !

If there is anyone who experienced the same issue , please chime in as any practical advice is welcome !

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I've never opened up one of the 240z autos to be able to chime in with anything useful, but I have a 3 speed auto transmission you can have if you need any other parts or for testing purposes. I live in central texas, not sure where you're at though.

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42 minutes ago, zeeboost said:

I've never opened up one of the 240z autos to be able to chime in with anything useful, but I have a 3 speed auto transmission you can have if you need any other parts or for testing purposes. I live in central texas, not sure where you're at though.

Thank you so much ! 

It is very kind of you ! I sent you pm

 

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A bad or disconnected vacuum modulator will disrupt proper shifting. Remember a vacuum line has two ends as well as the hollow tube. I would first verify the vacuum hose, then replace the modulator before tearing into the AT again.

There is no internal electronics in the AT. The only wiring is a switch for the starter enable and for the backup lights.

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7 hours ago, djwarner said:

A bad or disconnected vacuum modulator will disrupt proper shifting. Remember a vacuum line has two ends as well as the hollow tube. I would first verify the vacuum hose, then replace the modulator before tearing into the AT again.

There is no internal electronics in the AT. The only wiring is a switch for the starter enable and for the backup lights.

When I detach vacuum line from modulator then I cannot shift even to the third gear and when I attach it it shifts to third gear and skips the second one !  it leads me to the conclusion that it works !  Or could I be wrong ?

Downshift solenoid is working as it clicks when I connect it to battery but its role seems to be just to shift to lower gear when pressing full throttle !

Edited by Darko

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Did you try the solutions offered in the document?

image.png

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That's great that you tried but which ones did you do and what did you find?  I see these as the ones to do, based on what you said is happening.

image.png

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Manual control valve is ok , checked 

Governor valve -  I only checked downshift solenoid and vacuum modulator and they are ok although solenoid has has nothing to do with it . I cannot check anything inside the gearbox as it is now installed on the vehicle. Do you know how to check governor valve ?

New oil is in the system , and sufficient amount , there is no leakage 

Transmission air check - I only checked vacuum that goes from engine and it is ok 

Band brake is inside gearbox and cannot check 

 

If you have any suggestion what I can do while the gearbox is assembled and on the car let me know !

 

 

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