Was travelling down the A21 today towards hastings when i noticed i was doing 130mph (not) and it was red lining on the revs. I'm sure there are 4 gears on the auto box but when i get to about 70 ish it changes into 3rd and that seems to be it!

 

not sure why. will try her again later.

Do this diagnostics mate, and look in the online manual for suggestions.

 

 

 

Auto Transmission Diagnostic:

 

If you automatic transmission is acting erratically, may it be shifting too hard, shifting too late, shifting too early, etc. try the diagnostic to isolate the problem. The diagnostic, like the main computer diagnostic, may show an error code if it reads a sensor or circuit that is not within factory specs. If the problem is mechanical, the diagnostic won't show it. If it's electrical, then the diagnostic gives a general idea where to start looking to correct the performance.

 

Procedure:

 

1. Have the engine at normal operating temperature, in P with the overdrive switch on.

 

2. Start engine. The AT light (1.) should go out after 2 sec.

 

3. Turn the ignition off.

 

4. Move selector to drive D by using the Push Release button (2.). If not equipped, use the brake pedal

 

5. Set overdrive switch to OFF.

 

6. Wait 2 seconds and turn ignition switch ON.

 

7. Wait 2 seconds and move selector to 2.

 

8. Set overdrive switch to ON.

 

9. Move selector to 1.

 

10. Set overdrive switch to OFF.

 

11. Depress accelerator pedal fully and release it.

 

12. The codes will begin to flash. Theres one long flash that signifies the start of the sequence. Following should be 10 short flashes. Then it repeats.

1.AT light

2.Shiftlock

 

 

Error Codes:

 

All 10 flashes the same = No error codes detected.

1st flash longer than others = Revolution sensor is shorted or disconnected.

2nd flash longer than others = Speed sensor circuit is shorted or disconnected.

3rd flash longer than others = Throttle sensor circuit is shorted or disconnected.

4th flash longer than others = Shift solenoid "A" circuit is shorted or disconnected

5th flash longer than others = Shift solenoid "B" circuit is shorted or disconnected

6th flash longer than others = Overrun clutch solenoid circuit is shorted or disconnected

7th flash longer than others = Lock-up solenoid circuit is shorted or disconnected

8th flash longer than others = Fluid temperature sensor is disconnected or A/T control unit power source circuit is damaged.

9th flash longer than others = Engine revolution signal circuit is shorted or disconnected

10th flash longer than others = Line pressure solenoid circuit is shorted or disconnected

All the same with no long start flash = Battery low, been disconnected, or control unit has just been reconnected.

Also automatic transmission section here

 

http://www.300zx.co.uk/cgi-bin/manual.cgi

page 75 looks like a good start.

cheers. Jim.

Was travelling down the A21 today towards hastings when i noticed i was doing 130mph

Not along the Flimwell Bypass, more like 13 MPH! Great timing for major roadworks and extended road closures on a major coast route. My local petrol station was a 1 mile round trip, its now about 9.8 miles return.

Jim, You didn’t check that overdrive was ‘ON’ ie the O/D lamp wasn’t lit?

David

no, had the od switched off! so it should have changed before 7000 rpm i would have thought.

no, passed flimwell, it's so slow around there!

stopped off in lamberhurst to watch the football!

if o/drive was off then it won't change up into "4th"

really? why's that?

because over drive is basically the 4th gear. try seaching the forum, lots of info on the autobox

ah cheers pete,

will do that next time i have a problem to save everyone time!

cheers.

Jim.

if you OD light is lit your overdrive is off and you will only get approx 130mph. turn on the overdrive as said above to get 4th gear