Starting Problem in a Ford Expedition

If your Ford Expedition has a problem with starting, it could be one of several things from the ignition to a computer and/or sensor issue to internal engine problems. You need to figure out which area is causing the starting problem. If the engine light is not on, and assuming that the battery and alternator are working properly, check for fuel and spark first, and then check the computer and sensors using a scanner.

Things You'll Need

  • New spark plug
  • Shop rags
  • Screwdriver
  • Pull one of the spark plug wires off a spark plug. Stick the new spark plug into the end of the wire, then lay it on a metal part of the engine. A bolt is a good choice, as it must be cast or steel. You won't be able to complete this test against chrome or aluminum.

  • Ask a helper to crank the engine over. Watch the spark plug closely to see if it sparks. If it does, you have spark, thus the ignition is working properly. Leave the spark plug wire unplugged if you need to move onto the next test.

  • Layer shop rags under the Schrader valve in the fuel line, which is located on the top of the engine. Remove the cap. Push the Schrader valve down with the screwdriver. Ask the helper to crank the engine over. Stand back while holding the Schrader open -- the fuel could shoot out a couple of feet into the air. If the fuel just dribbles out, the starting problem is in the fuel system -- fuel pump, fuel pump relay or wiring. If the fuel shoots out more forcefully, the fuel system is working properly. Reattach the spark plug wire.

  • Check internal engine components -- some can be checked without taking the engine apart. If you hear the timing chain rattling, the problem is with the timing chain. If the engine just clicks when you try to start it, and you know the battery, alternator and starter are good, you could have a locked-up engine. If you previously overheated the vehicle, you could have a blown head gasket, which could possibly hinder starting.