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The IDM is located behind the F250 emblem on the driver's side fender. Pull the rear of the wheel well liner loose and you'll be looking up at the IDM connector.
The P1667 has to do with the CID (cylinder Identification) circuit, that the PCM uses to tell the IDM which cylinder to fire.
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First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
99.5 F250 PSD Supercab LB 4x4, 6spd, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, Jody's 80 HP Econo PCM (classic version  ), AIS, coolant filter w/"hokum" bracket, regulated return, heated mirror mod, lighted cupholder, Marinco heater plug-in.
Hard or no-start? Check here
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