85 300ZX CRANKS BUT WONT START!

run the fault codes and look for low pressure in the fuel system. failing fuel pump

Ask a local mechanic to have a look for you ,faults could be anything for this problem although i would suspect that the petrol pump could be faulty or the electrical connections to the pump which is under the back seat behind a cover which allows access to the pump /sender unit ,could also be the elcetrical connection on the unit playing up as well so look for burnt connections in the socket to this unit

It is most likely one of two issues. Either the Camshaft sensor, or the Crankshaft sensor. Neither is too expensive nor too hard to replace. Try the Cam Sensor first. The 5.2L seems to have these more often. The 2.5L has the same problem, but it's usually the Crank Sensor.

might be out of time,or exhaust clogded up,could be a lot of things thats two you could have checked out. rodger....

You didnt list the type of car this is, the most common thing that causes this is the starter, i just had a saturn, the customer had the same problem we told her it may be the starter but cant be 100% sure until it actted up, she didnt want to replace it unless we were sure, so we kept and drove the car around for 5 days and finally the last day it didnt start and it was the starter , same problem turn key and nothing no noise and no start, i would have the starter replaced and go from there, its a mater of time before the car just wont start,hope this is helpful.

could be the oil pressure switch or a computer ground problem

starter is gone /replace.adrian;;;

You most likely have a bad fuel pump. Very common symptoms your describing, If your handy try squirting some brake cleaner into the throttle body when this happens. If it starts you now know what to do. Also be sure the battery terminals are clean. Voltage drops can cause a fuel pump not to run or run ineffeciently.

Mine does the same thing. Check the #11 fuse under the dash on the passenger side wall.

Sounds like a crank sensor.