Nissan Repair: 1993 240sx no start, fuse box, 240sx

Question
QUESTION: The first time I started the car it ran fine I let it idle for about 30 seconds but it in reverse and the car died when I pressed the accelerator. I checked all the fuses and saw that the engine control fuse was blown replaced. It car would crank but no start I put the key in on position and there is a buzzing coming from the engine bay I pulled fuse by fuse to stop the buzzing andwhrn I got to  the ignition switch fuse the buzzing stopped next I checked for spark and I didn't not have any spark or fuel so I checked the egi relays and egi pump relay I switched them the car started and it idled for a good while I backed out and went toward sounded like it was misfiring and the car died again what should I do? The buzzing is still there with key on engine off is this a short and if so what do I check?

ANSWER: Miguel,

I would replace the relay that is buzzing and try again.  I would also replace the one you switched and see how it goes.  Make sure there are no aftermarket things wired to the fuse box.  If so, disconenct them, amplifiers and such will overload the circuit and rob power from the ignition circuit.

---------- FOLLOW-UP ----------

QUESTION: None of the relays are buzzing it's coming from the engine bay and it only happens with koeo the ignition switch fuse was not blown but it stopped the buzzing I put it back in swithched the egi relays and the buzzing stopped and the car started but died again. There are no aftermarket items on the car.  

Answer
Miguel,

The source of the buzzing has to be found to figure out what is going on.  If the engine bay is buzzing, get a long screwdriver and place it on the starter.  Do not touch the terminals.  Just rest the blade on the body of the starter and then have someone crank it over listening with your ear to the handle and see if the starter is making noise.  It could be that the starter is not working properly.  You are going to need to start backprobing the circuits.  I would almost bet the problem is with the ignition circuit.  You need a test light or a digital volt ohm meter and start doing the systems one at a time to see where the current drops off.