1990 nissan 240 sx starting problems?

Question

after the car is drove for a couple of hours or longer and you shut it off and try to restart it it trys to start but will not.

help please

Answer 1

check the timing on it also if you get a new fuel filter get the one for the non turbo 300zx i did on mine and it made it run way better it gives it a little more fuel but not enough to run rich and i think it even helped my gas milege

Answer 2

the battery is dead

if continues have charging system tested

Answer 3

Try boosting it and if it starts right up for sure get a free charging system and battery check performed.Also if you've not changed the gas filter on a yrly basis I'd change it regardless if battery or starter etc is good or bad.Plus I'd check the PCV valve and air filer too.

If that vehicle has a ignition coil that could be acting up , check it's housing for cracks , or discolourizations or bumps or cracks and check the wires connected to it too.

That aged vehicle probably needs the electrical charging system's circuit over hauled and that could be part of the problem you're having now.You'll need to check, for corrusion or rust and maybe clean the system with fine sandpaper , small wire brushes the battery, starter, alternator posts, connections and connectors, plus the engine block ground, clean or replace any and all ground wires,plus use new screws etc in connecting the grounds ,and create new ground wires or ground connections when their too rusty etc to remove.If you want to spend the time it's well worth it to take out the relays , and fuses with the battery disconnected and clean their connectors, especially any fuses etc located under the hood. Plus clean , re-gap or change the spark plugs , clean the connectors  inside the spark plug wires with a flat head small screwdriver, just be careful not to scrape the wire itself inside the connectors and be sure to clean the ignition coil connectors too.Plus I highly recommend changing the gas filter especially if you've not been changing it on a yrly basis.

Don't even worry about any old grounds if you made up new ones as long as their not in the way and you've it done right.

Hope that helps and best of luck.By the way it might not be a bad idea to pick up a service manual  for that vehicle. I'd highly suspect the problem is related to bad battery or corroded or rusty connections especially if the parts you've been replacing in the past are battery's , starters and alternators etc.