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Quote: "...Some newer diesels have an exhaust choke that activates when cold to increase backpressure and thus temperature, to help warm the engine. This creates a very distinct and noticeable sound on some Powerstroke engines especially that sounds like a jet turbine even at idle...."
My 1996 F250 Ford pickup truck has a 7.3L diesel engine with such a warm-up valve; they call it an Exhaust Back Pressure Valve, or EBPV . It is actuated via a 12VDC signal and operates via oil pressure. A lot of users eliminate the EBPV if and when it begins to leak oil or otherwise malfunction rather than repair or replace it.
Others, like myself, put a $5 electric switch on the EBPV's 12VDC control wire so that we can turn it on and off via the switch. The reason: for all practical purposes, the EBPV acts as an exhaust brake, which is very helpful coming down steep grades when towing a heavy load. I've often wondered why Ford and International, the engine's actual maker, didn't advertise it as an exhaust brake in addition to being a fast warmer-upper. If they had done so, they would have had the first diesel pickup truck on the market with an exhaust brake, which has now become a standard feature for diesel pickups.
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