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IMHO, if you are talking 1 to 4 seconds more starter time before it fires when plugged in, depending on OAT, then its normal. All of the 6.0s I have started, including my own and a half a dozen work trucks have been the same to some degree.
First off I am not a diesel tech. But I believe the PCM doesn,t know the heaters plugged in until the starter turns over and the sensors detect an unexpected change in oil and coolant temps/pressures. At which the time the PCM has to readjust fuel to lower emissions. In other words its all about the 6.0 emission control calibration in my opinion.
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2004 F-350 Lariat, Supercab 4X4 FX4, DRW
Dark Toreador Red/Silver, 6.0L, Torqueshift Auto, ESOF, 4.10 LS, Camper Package, Dual Alternators. Build Date 6-8-04, Eng 5-28-04, Lance 9.5 Ft Camper.
Past 2002 F-350 Lariat, Supercab 4X4, Toreador
Red, 7.3L, Auto, DRW, Fully Loaded.
Past 94.5 F-250 Lariat, Supercab 4X4, 5 spd 7.3L PSD.
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