The SE-R is an options package available on the Nissan Sentra. If your Nissan Sentra SE-R won't start, there are several factors that could be to blame.
Often times when a car won't turn over, it is due to a problem in the ignition system. These issues can range from something as simple as ignition lock by the steering system to more serious problems like a faulty alternator. If all the parts of the ignition system seem to be in working order, the problem could also be an issue of engine timing.
While the Nissan SE-R is generally known to have a fairly cleanly running and efficient fuel system overall, the car has been subject to recalls related to the fuel pump. This recall affects cars within the 1991 to 1993 model years. Cars built during this time period are subject to fuel pump failure, which causes the vehicle to become unable to operate.
Many problems with the SE-R result from the vehicle's exhaust gas recirculation system (EGR), which redirects exhaust gases back to an intake, decreasing combustion temperature in the engine and reducing nitrogen in the emissions. These gases, however, still have particulates in them that can easily collect deposits inside the engine and choke up the entire works. In very extreme cases, this can cause the car to become inoperable.
