Need help my 90 ford aerostar won't start!?

Question

Need help my 90 ford aerostar won't start!?

Answer 1

An engine needs three main things to start. Fuel,Spark,And Compression.  

Answer 2

The source of this problem could be anywhere from the obvious (empty gass tank or dead battery) to some tricky anomoly. You really haven't provided enough information to make an intelligent diagnosis, but let's first take a look at the basics.

Does the starter turn the motor?

If not, check the battery. Will the headlights light up brightly? If so, the battery is probably okay. The starter may be bad, but it needs a good strong surge of electric current to turn the engine, so connections between the battery and the starter must be tight, and the starter switch must do its job to  move that current to the solenoid and then to the starter.

If the starter does turn the engine, then we need to check the ignition system and fuel system. The ignition system must send a spark to the spark plug at just the right time. Even a 1990 Aerostar has a fairly sophisticated electronic ignition system that is usually reliable. A simple check would be to remove a spark plug wire and a spark plug, Plud the spark plug into the plug wire boot, hold the spark plug up against a metal part of the engine that doesn't move, and have somebody turn the ignition key to crank the starter. You should see a fat white spark jump across the spark plug electrodes. If you do, the ignition system is probably doing its job.

These leaves the fuel system. This is a little harder to check. Are the fuel injectors opening up and allowing fuel to enter the intake port? It's hard to tell. But if that spark plug you just removed is wet with gasoline, then it's fuel injector was supplying some fuel. If not, I would suspect a bad fuel pump (or an empty fuel tank).

In summary, you need fuel, spark, and a functioning starter to start any vehicle.

If you have all three, it should start.

Answer 3

need some info