My 1991 nissan 300zx n/a rumbles in 2nd and wont select top? also when driving at speed then taking foot off accelerator the revs fall very quickly to around 1000rpmwith overdrive on the revs dont fall as quickly but still quicker than they should? any ideas what the problem could be and how to solve it?
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It sounds like you have a bad speed sensor on your 300ZX as these sensors provide input to the ECU on when to shift your transmission.....Figure out where it is and replace it and your problems may go away.
Just keep in mind that on 1992 Nissan/Datsun 300ZX 3.0L SFI DOHC 6cyl the Vehicle Speed Sensor is located Mounted on transmission.
Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.
On all 300zx NA the speed sensor is on the passenger side of the transmission. There is portion called the adapter plate in the middle of the transmission when looking at the side profile. This plate is about an inch thick and seems to separate the transmission from the front main body to the rear housing. The speed sensor is just aft of this (towards the rear of the car). It is round smooth top with a set of wires coming out of it leading up to a brown plug (no sure if color changed for different years)
the speed sensor is on the the tail housing of the transmission, located by the firewall straight down from the back of the engine, it is a round looking sensor on the top of the housing has a 2 wire plug with about a 8 in. lead, but it may not be the problem, I have one also that I think is the speedo itself, this sensor sends the signal right to the speedo and then the speedo have a processor that sends the signal to the ecm.
cornejo1971: There is no crank case oil breather per say. There are two PCV valves on the engine. There is one located on the intake plenum on each side. Typically there are hoses which come off the tops of the valve covers that go to the PCV valves.
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