I have a Nissan N16 car with a 5 speed manual gearbox. I have a issue with its shift. When I try to shift into 1st gear, it is very hard to put it in - but not in to other gears. I have to push harder to shift to 1st. not smooth.
However, sometimes it works smoothly. I have tried pressing the clutch and different levels but nothing makes any difference.
Why does this happen?