Interesting, I wonder if a FI engine would get throttle body icing instead? Assuming butterfly valves of some sort are used to control air volume to the intake manifold that could be a chock point where you could get icing. But in an aircraft engine you would also think they would have heat available to limit that, this is FSX however so the quirks are many. Thanks for the H key tip, completely forgot about that one.
My guess would have been anywhere in the induction system that is capable of being affected by structural type icing.
Rather than bloviate further from what tiny bit I know; two points, one from a powerplant maintenance classbook cleverly entitled "Aircraft Powerplants", the other from an AOPA Safety Advisor.
From Aircraft Powerplants by Bent / McKinley 5th Edition
"Fuel Injection systems have a number of advantages, among which are the following:
1. Freedom from vaporization icing thus making it unnecessary to use carburetor heat except under the most severe atmospheric conditions."
From AOPA's Safety Advisor - Aircraft Icing (
http://www.aopa.org/asf/publications/sa11.pdf)
"Fuel-injected engines have no carburetor and, therefore, no carburetor ice problem. However, when conditions are favorable for structural ice, fuel injected engines can lose power and even fail if the air filter and intake passages are blocked by ice. (This can also occur in airplanes with carburetors.) At the first sign of power loss, activate the alternate induction air door or doors. When these doors open, intake air routes through them, bypassing the ice blocked normal induction air pathway. Many alternate induction air systems activate automatically; these designs use spring-loaded doors. Suction in an ice-blocked air intake draws these alternate air doors open. Some older fuel-injected airplanes have alternate air doors that must be manually opened. Knobs or levers have to be physically moved to the open position in order for alternate air to reach the engine."
*"Fuel-injected engines have no carburetor and, therefore, no carburetor ice problem." obviously referring to the carb's venturi / method of fuel delivery and latent heat of vaporization.
(
http://www.aopa.org/asf/publications/sa11.pdf)
===============
There's a lot of great stuff to like regarding FSX... on the weird stuff, I'll ignore it (e.g. how mixture operates - I use automixture) or just let my imagination re-write what's in error ("H" for Alt Air in the Baron as this one no spring-loaded door).
. Not much to see either as we crossed north central Washington, vis was very hazy with only 10 to 20 miles range. Might be getting the hang of cross wind landings in the Bonanza thingy as we actually stayed mostly near the center of the runway this time 
.
, set the autopilot and went for a needed visit to the throne room, came back and I was in flames at the bottom of a canyon :isadizzy:. Must remember to buy depends before I fly another one of these events. While reflying the leg I hit icing conditions twice in the same area of the crash so I'm assuming that's what happened while I was occupied.