your head gasket is probaly blown.
1342
A 1990 Nissan pickup truck has power steering. If the truck is displaying symptoms of not having power steering check the fluid levels and pump itself.
It'll fit, but it probably won't work very well, as a 1996 transmission would be wholly electronic, and the 1990 transmission would not.
The Nissan 4x4 pickup 2.3 was produced from the years 1990 to present in the United States. The spark plug gap on a 1986 Nissan 4x4 pickup 2.3 is .044.
underneath passenger side seat
I have a 1990 Nissan Pickup 4 cyl. manual transmission. The Flasher is under the dash to the left of the steering wheel. It is near the top of the clutch petal. Turn the key on and start the signal. You should hear where it is at. Put your hand on it and you will feel the vibration and the sound will change. I still have not figured out how to get it off.
In the ac box
Go to www.installdr.com .
Probably not.
There is no OBD connection on a 1990 Nissan as that is an OBD1 vehicle not OBD2. However there is a way to read the codes. https://codes.rennacs.com/Petrol-Engine/Japanese-Korean/Nissan-Engines.php
Look in a removable housing at the engine end of the upper radiator hose
Well It depends. The engine might be a little different, the the instuments should be the same. Also, a 1990 pickup and a 1992 Pathfinder are pretty much the same in instuments.