Join Date: Jul 2012
Location: AJ, AZ
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The buzzing under the hood is the vacuum pump, which operates the dash vents and vacuum operated hubs if you have a 4X4. It is totally normal.
The hard start could be caused by multiple different things, so more diagnosis will be required if it happens again. It probably is not related to the chip.
You can more than likely identify the chip type if you look at the ECM located behind the driver's side kick panel. Do a google search for "chip install 7.3 powerstroke" or go to one of the vendor's websites (PHP, DPTuner, etc.), where they show how to install a chip. My guess is that the chip will have some type of identification on it (I'm guessing, since I don't have one yet). Also, are you sure it only has 5 positions? If it has 6, it is likely that it is a TS style chip.
2000 F350 4X4 CCSB w/ 7.3 and 4R100
6637 Filter, CCV Mod, Leveled Front, 315/75/16 Goodyear Duratracs