Will a bad computer module on a 1999 ford expedition make the ignition coil not spark

Asked by Oct 26, 2014 at 11:30 AM about the 1999 Ford Expedition 4 Dr Eddie Bauer SUV

Question type: General

I Checked the plugs and wires changed
ignition coil two of the plugs still not firing
why?

1 Answer

74,205

Check the compression on those two cylinders. If they're next to each other and both have low compression suspect a bad head gasket. If the compression is good it could be a bad ignition control module or defective coil pack. Bad fuel injectors are also a possibility. Check the spark plugs for gas on those two cylinders as well. HTH. -Jim

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