95 nissan maxima 3.0 no spark no fuel pressure turns over fine checked and replaced crank and cam sensors still no spark or fuel pressure

Now you check fuel pressure at motor with a gauge

Also check for spark & injector pulse while cranking

Car not starting or turning over indicates towards multiple possibilities. It can be issue with battery or weak battery. But if battery checks out ok, then it can be starter issue or faulty alternator or problem with low fuel pressure or no spark at spark plugs due to dirty spark plugs or faulty ignition coil or injectors getting cracked or dirty and needs to be cleaned.

To confirm the problem, the basic troubleshooting is required.

Click this link below and follow the troubleshooting:------

http://technoanswers.blogspot.in/2012/02/car-starting-issues.html

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This will help.

Thanks.

Sudden death in vehicle is usually based on something electrical. Check fuses and relays with fuses. Check 1) spark on each plug in turn 2) crank sensor 3) coil 4) cam sensor 5) main relay. Put ignition on position 2 and listen at the open fuel filler pipe for the pre-pump operating. Listen for main pump operation. (If unsure what it is you are listening for remove the fuse for the pump and you nshould notice it being quieter) Check fuel rail for pressure (there is a Schrader 'tire' valve on the fuel rail for pressure testing purposes). If fuel flow is low then this could be blocked fuel filter or tired pump. Finally make sure throttle body is good and clean internally at least and that associated idle air valve is clean and working. With fuel air and spark at the right moment the engine should run. My gut feeling is the crank sensor

Couple of other things to check!
1. Check the fuel pump.
2. Check for all related fuses....fuel pump,ignition,battery etc
3. Check for spark from ignition coil...if no spark present ,could be crank sensor faulty(located on the side housing of the timing belt) or the knock sensor located the same side at the bottom below large belt pulley....

seems like you got all you need , check the sparkplugs the engine may be flooding itself, (one guess),

did you replace the knock sensor from the old one to the replacement one. ? double check the sensors are the correct ones fitted to your original engine are on the new replacement, also check the connection plugs, sometimes these cannot connect fully if have become weak.

sounds like u need two coils

Sounds like a failing crank or cam sensor; does the car have spark? Remove the main lead from the coil and position near a grounded piece of clean metal, place it @ 1/4" away and crank engine over for 2-3 seconds and watch for spark; if nothing it will give you some direction. If there is spark check for fuel injector pulse; rent some NOID lights from Autozone or such and unplug one injector and plug in NOID light and crank over for 3-4 seconds if you get a pulse of light the injector pulse should be ok. Next area I'd check is fuel pump, you'll need to check for fuel pressure, some special tools needed here plus your working with gasoline, take care of no spark/no flame. You may be able to listen for your fuel pump...turn off items such as fan, radio and such, make it quiet crank over motor for 2-3 seconds listen for a click (that would be your fuel pump relay and when you let go of your key you should hear the fuel pump run for just a brief second, I expect pump in the tank.
One of these I hope should get you in the proper direction.
I hope this may have helped you,
Tom

Check timing belt. Shoot a timing light down at your crank. If the timing mark jumps around bad, your belt has slipped.

It is most likely to be your fuel relay, however check your fuel filter and fuel pump.Hope this helps