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KOEO, KOER, and CM codes are EEC-IV designations for the types of codes the computer can output. I don't know if they carry over to EEC-V. You never did say what year Explorer you have, but, from the code numbers you gave, I would assume you have a '96-'00 (or whenever Ford dropped the OHV from the Explorer lineup) EEC-V. In any case, each code has a designated diagnostic tree associated with it. The code reader doesn't have this information, you need to get a good manual (many public libraries have these) which can tell how to diagnose these systematically. I'm not real familiar with EEC-V, so I can't really help you other than in generalities.
One thing I can say, is that those codes could be consistent with low fuel pressure (as has been suggested). Earlier models used a return-type system (which I'm familiar with), later models used a returnless system (which I have never seen). Not sure which year they switched (think it was '98), but another reason why knowing which year you have will help us. Testing the fuel pressure on the return-type is pretty easy. Get a fuel pressure gauge (most parts stores will carry these for $30-$50), attach it to the Schrader valve (looks like a tire valve) on the fuel rail, and test the fuel pressure.
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'87 Bronco II XLT 4x4 & '92 Explorer XLT 4x4 & '98 Chev Suburban K1500 SLT 4x4
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