1999 nissan maxima won't start. changed fuel pump and have spark?

OK, tech stuff is nice if you know what your doing or maybe you play around with your car alot. But lets start, with the idea that you don't know anything and would like to take a shot at finding the problem. First off when you say %26quot;won't start', does this means that the engine cranks but won't fire up. So lets start from the beginning. Your battery should have 14.5 volts at a standstill. Use a volt meter to ck this. Then crank the engine with your key. The cranking voltage can't go below 10.5 volts or the engine won't start. At this point lets say that the engine cranks and has the required voltage. This solves the possible first problem area. Next pull a spark plug and look at its color. If its black and wet, the plug is fouled out and will need to be cleaned or replaced. Next if you have a good spark plug or a screwdriver, ck that you have spark. Ok , lets say the plugs are good and you have spark, so we go on to fuel. When we had carbs it was simple, but with fuel injection the rules changed. First crank the engine and using a screw driver (one that is long) put one end on the injector base and the hander end to your ear. You should hear a tapping or clicking noise. You hear the noise, that's good, no noise, get the car to a dealer. Next you need a fuel pressure gague. Your fuel system is a closed loop type. Meaning, at the the you crank the engine, there should be fuel comming from the gas tank to the engine and back. Not only do you need fuel flow but you also need pressure. I don't remember the correct pressure, but a steady 35 lbs. will do. Now stop cranking the engine, your pressure should stay. If it drops real fast you have a problem or two. Example: open injector, open one way value, leaking fuel line and such. At this point something should show up as being wrong, including the anti-thief system. If your problem does not show itself, get your car to the dealer. You could even have a mechanical problem or maybe two problems. Just remember to do the easy things first, maybe your out of fuel. Now if you can follow what I have said, them good. If I lost you, just get the car to a dealer. This is as simple as I can make it for you. Good luck, T-Bear.
1999 nissan maxima won't start. changed fuel pump and have spark?
How about this one. You recently lost a key and had one made. or the spair key is now being used? Sound likely? or the key your using is beat up. 1999 Maxima's have Imobilizer called NATS embedded Chip key. That chip close to the antennia coil around the ingnition lock sends a signal to the Smart Entry control that allows the ECM to turn on and car to start. If you used a NOID light you would see that the injector pulse was not there. Nissan calls this LOCK MODE, motor cranks but does not start. TOW the car to a dealership gather up all the keys and have nissan reprogram all of them they can and cut a couple of extra keys. Really Good Lock Smiths! with computerized Key systems can do it also.
1999 nissan maxima won't start. changed fuel pump and have spark?
Well you first need to find out if there is fuel pump pressure. Just changing the pump doesent mean there is pressure. Next you need to find if there is an injector pulse( meaning the injuctors are fireing. You need what is called a noud( from the auto store). THis device will flash when it id conected to the injuctor plug. If there is no pausle then you have a crank and or a cam senser out and it will have spark but will not turn on the injuctors.
Not sure on the question however hope this will help all those before shelling out thousands of dollars to those crooks called mechanics.. This is the problem I ran into. Cold starts dies out unless you rev up your engine. 1. Clean Mass Air Sensor with spray %26quot;MAF%26quot;.. 2. Get a Intake Cleaner/Carb Cleaner and spary the intake. Gas once dried can become thick and stickie. 3. Clear your codes from any Autozone for free. This should be your solution to your O2's, Knock Sensor, Misfire, Idle Control etc etc readings. It worked for me and hopefully will work for you. It's quite simple Keep your intake clean and replace filter regularly. Air and Gas creates the engines power and if not mixed properly with restrictions the computer will go crazy and will not be sure what the actual problem is.. I think its Nissan's scam.. = ) God Bless