Hyundai Repair: 1996 elantra starts sometimes, fuel pressure regulator, crank sensor

Question
having a problem with this car starting cositantly checked starter, replaced fuel pump it's got power, replaced crank position sensor.if i hold the key all the way over while holding the gas for about 3 sec i can usually get it to start and it runs fine sometimes wont start at all it's random but you can hear it trying to crank any ideas would be greatly appreciated thanks

Answer
Hi, Marvin.  I understand the engine doesn't start, but it's critical to know whether it cranks normally when it doesn't start.  This will help determine whether we have an issue with turning the engine or an issue somewhere else preventing the engine from starting.


When the engine doesn't start, does it crank?
If it does crank, does it crank slowly?

If it doesn't crank or it cranks slowly, you'll need to check the charging and starting systems (battery, starter, alternator, etc.)

If it cranks normally, then we'll need to investigate things like the fuel pressure regulator and the crank sensor.  

Does your check engine lamp come on while the car is running?  If so, you should check the diagnostic trouble codes that are stored.