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Re: 94 k2500 no low end power and horrible fuel mileage
the scan tool is for OBD11. a 1994 is OBD1. OBD1 code reader. 500 rpm is good. should be 500-600RPM and stay steady in and out of drive. IAC does this. the vacuum must be checked and do the testing. the MAP can be bad reading wrong. the voltage out at idle should be 1.2 volts. if its wrong the the mixture will be off causing it to run rich fouling plugs. you say dieseling this is from high amounts of carbon in the combustion chamber. this reduces the size of it increasing comp ratio . this then causes it to get so hot the engine runs because the glowing carbon is causing the fuel vapor to continue to fire.
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