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1994 Nissan 300 ZX wont shift into overdrive

Tiny
2CP-ARCHIVES
  • MEMBER
  • 1994 NISSAN 300ZX
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 112,000 MILES
1994 Nissan 300 ZX mileage: 112,000. My car has a three speed automatic with an electronic overdrive for fourth gear. When I switch the overdrive on, it stays in third gear even when the car is warmed up. The switch and overdrive solenoid are working but I have been to several auto electricians and they cannot seem to find the fault. Could you please give me a few suggestions on how to fix my problem? Thank you.
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Tuesday, November 9th, 2010 AT 10:55 PM

1 Reply

Tiny
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  • MEMBER
  • 4,540 POSTS
The overdrive circuit is controlled by the engine temperature sensor to prevent it from going into overdrive when the engine is cold. If the sensor is faulty, it will not allow your transmission to shift into overdrive. Also, check the thermostat, if it is stuck open, it will not allow the engine to come up to normal temperature and the transmission will not shift into overdrive.
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Tuesday, November 9th, 2010 AT 10:58 PM

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