Van has fire but wont turn over.

Well, those are classic symptoms of bad engine timing, so I'd have that checked. Maybe your timing belt has jumped a tooth.

Be careful with that starter fluid, you could blow yourself up.

Tune up ,fuel filter,module,battery and connection.

Try spraying starting fluid into the intake. Remove the air filter to do this. If it starts for a few seconds then you have a fuel delivery problem. If it does not, then you have an electrical problem with the ignition. there are 3 things needed for an engine to run if it turns over. Air, Gas, Spark (fire). No air filter solved the easy air issue. Add starting fluid answers the fuel issue. Only leaves spark after that.

DID YOU GAP PLUGS CORRECTLY? CHECK TO MAKE SURE SPARK PLUG WIRES ARE IN RIGHT FIRING ORDER QUESTION DOES ENGINE TURN OVER LIKE IT WANTS TO START???? CHECK ALL FUSES SOME HAVE STARTER RELAY FUSES ALSO MAKE SURE TRANSMISSION IS FIRMLY IS PARK MAY HAVE A STARTER SAFETY RELAY CAR WONT START UNLESS PARK IS ACHIEVED.....GOOD LUCK

MAKE SURE GLOW PLUGS ARE GETTING VOLTAGE.COULD BE PREGLOW RELAY.ANOTHER POSSIBILITY WOULD BE FUEL PRESSURE SENSOR AT BACK END OF FUEL RAIL.

battery good? enough amps. did you put all the wires on the starter.ground wire also.
if turns over then starter good, if not, bad starter/sylenoid or connection.
check to see if you are getting fuel , depending if carb just mesh on trottle to see gas poured in, if fuel injected there should be like a valve(like the one on the coolant line where one put freon in, press to see if pressure comes out. check spark to see if it is getting fire. all the above check out then it may well be computer might be bad.

If the motor doesn't turn over at all then it's probably a starter/solenoid problem. If it turns over but won't fire up, get some starting fluid from auto parts store and spray some into intake. If it fires there's a fuel delivery problem. So change fuel filter and try again. If that doesn't work, then change fuel pump.

i had a similar problem and called the dealer during lunch hour. i talked to a mechanic, the distributor in these vehicles is plastic, and is prone to cracking.not just the cap but the body also, I have been taking the cap off and wiping the moisture out of the cap. or replacing the cap but the problem is I need a new distributor. just a cheep way to get rolling is cleaning the inside of the cap, especially when it is very damp or the outside temp changes alot during the day. good luck.

I can only say that for the old cars even sitting for a year is not healthy, because most parts of engine, starting system, charging system will get corroded/deposited. Most probably you will need to change battery, motor oil, fuel, spark plugs, check the starter and alternator. Also check the fuel pump, fuel filter. First shot would be battery, fuel, spark plugs and starter.
Good Luck

Did you try to replace the starter cable? is the Truck turning over or just clicking.? If it's turning over and not starting. Best guess would be one of two things. Knock sensors Located under intake manifold. they get wet and deteriorate or the fuel pump. I've replaced all three on mine. 233k still running strong...