7.3 powerstroke

  1. E

    6.9 idi tachometer reading 2x actual RPM

    I have a 1994 f350. It was originally a 7.3 powerstroke and a previous owner for some reason put in a 1983 6.9 idi. I installed a 1993 idi wiring harness, Ecm, and a newer injection pump drive gear housing with a tach sensor. When I fired the truck up it was reading 1500 at idle. The truck has...

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