Question about 1991 Nissan 300ZX
When a tranny has this sort of problem the modular unit or actuator piston is registering the tailshaft/ engine speed ratio at the point when a shift is required. Have a auto shop check the pressures in the tranny as it may be a mechanical adjustment problem or if electrical it may be the wires in the oil or the unit itself
Posted on Jan 12, 2013
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Posted on Jan 02, 2017
Most likely the turning on and off might have trigered or burned out your relay switch located in the front of your engine. The overdrive button on your nissan was only ment to be used sporadically and not as a stick vehicle ( According to your expression ). You can purchase this relay in your nearest nissan dealer. Good luck.
Posted on Dec 17, 2008
juan: there is a cable which comes from the transmission to the throttle linkage. This is called the TV (throttle valve) cable. This is designed to work in conjunction with the position of the throttle. I'm sure you heard the term "KICK DOWN SWITCH". Well this essentially is doing the same thing. If the cable is out of adjustment, it will have a tendency to want to downshift into 3rd.
Even though overdrive is electrically actuated, it can be disengaged by the throttle position.
There is also a coolant temp sensor which keeps the transmission from shifting into overdrive until the coolant temperature reaches a certain point. The sensor tells the ECM to tell the Solenoid it's ok to supply a ground to it.
Your overdrive switch provides a ground to actuate the overdrive solenoid. Make sure the switch has a solid ground serving the circuit.
The torque converter solenoid picks up it's ground from the ECM.
Both solenoids are served by the same power source which is a switched circuit through the ignition.
I hope I have shed some new light on your problem and given you some new direction in which to look. I hope I have helped you resolve your problem. If not, I'll be watching and will be ready to offer more help if needed. ..mybunkey
Posted on Apr 16, 2009
well Im sure theres a ton of miles on it-do u perform reg maint like checkin fluid level-u may need the throttle cable ajusted that hooks to trans-band n clutch could be out of measure too--trans hydra-valve system could be worn--see all these things effect the way the fluid makes the gears move--a pressure test can confirm an aging trans
Posted on Sep 19, 2009
This code indicates a mechanical problem inside
the transmission. Likely in the valve body or the torque converter. He
is a description of the cause and a list of possible problems. To
diagnose this you need a scan tool capable of reading the trans control
module and a pressure guage to read the fluid pressure.
Posted on Dec 03, 2009
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