1991 240sx not starting NEED HELP!!!!

[wwwKUSTOM-KREATIONScom]

I need help, I got a 240 with the ka stock, it turned off the other day while driving it and I havent got it to start again. The motor spins while cranking, there is fuel going into the manifold. It has a weak spark, so I changed the Distributor cap(nothing), I changed the Ignition coil(nothing) anything else you guys think it could be, anything will help. thanks

[bige240]

I'd say check the vac lines , the o2 sensor, the coolant temp sensor, but most of all check out the mass air flow sensor...all of these things have been known to cause trouble often...If your check engine light is on, check the trouble code on the ecu...Most of the time on these cars it is some sensor that craps out.

[elwesso]

Welcome to NICO!!! I agree with bige, check and see if the ECU is throwing any codes, thats at least a place to start....

Always the first place to start is checking fuel pressure. Just because you have fuel pressure doesnt mean its ADEQUATE fuel pressure. Check that first.... When you check for spark, always check it against the INTAKE MANIFOLD.

[rotorimp]

Also look at you spark plugs----are the wet, do they have crusty black stuff all over them, are they worn out. if they are good get another one of the same kind--ground it to bare metal/have someone crank it over and check and make sure you have a nice blue spark.

[BlueTyGator]

check the pickup, (underneith the distributor cap) it can go out and cause the car to just die

[AZhitman]

^ THat's where I'd look - Check the pickup for sure.