Easy way to check coil pack and hi tension cable, use a spark plug cut some of the threaded part to leave a 10 mm gap to the center electrode weld on a clamp , clip the clamp to earth attach the Ht cable to the plug, the spark must jump this 10 mm gap. Note don't run the engine longer then one minute as the mixture will be rich and heat up the converter
SOURCE: 1997 Ford Explorer AWD 5.0 v8
you might want to replae the map sensor and or the egr valve either of them can make it backfire
SOURCE: firing order
that is true your firing order is wrong here is a link to a web sight that has all the 1998 explorers 6cyl just click on the one that your explorer is and it'll show you the correct firing order also make sure you have your plugs gaped right good luck.
http://autorepair.about.com/library/firing_orders/bl-ford-firing-98.htm
SOURCE: MY 1999 Ford Explorer will not start.
You may want to check a few other componants before you write-off the ECM. It could be it but its not common. The cam or crank positioning sensor, the ignition pick-up, the MAP or MAF sensor, And possibly the ignition switch.
SOURCE: I have a 2005 ford explorer that will turn over
Make sure your fuel cut-off (Or inertia) switch hasn't been disabled. Reset by pushing the button.
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