I have to agree with Sludgy on this one. I drove many E-350, -450 and -550 Diesel platforms and saw the run of problems up to and beyond the 100K mile mark on the PowerStrokes. The International/Navistar engine corp. was rushed by Ford to produce a light-to-medium duty turbo-diesel since their non-turbo engines were quite underpowered when compared to similar offerings from GM's Isuzu brand in Chevy/GMC applications and Dodge's legendary Cummins I-6 -- both of which offer better FE over their gasser V-8 counterparts. Similarly, Volvo and Mistubishi had a superior product for their U.S. truck market. Enter the "Ford PowerStroke Diesel".
But were Ford mechanics ready for the new PSD? Apparently not. Many dealers failed to seal the air-intake system during either routine maintenance or recalls. The result: lots of dirty, sandy, or dusty air being sucked directly into the engine and its consequent demise. "Dusted" engines and dealers not owning up to faulty repair claims prompted legal action and many new engines were provided to owners after a long fight. Since a TD sucks-in air many-times over gassers, the sand blasting took its toll first on the turbo vanes, then piston rings and walls of the cylinder, and finally ka-blooey. They even screwed it up on engine replacement and it happened 2+ times to some owner. Not good. Since 80%+ of the Ambulances on the road today have a Ford Diesel engine and chassis, does that make you feel a sense of confidence in the response in an emergency?
We were thrilled to have more power, but the new tech's flaws showed through. Broken valves, dusted engines, premature turbo failure, and exhaust leaks made them unreliable. I mainly drove the older, pre-turbo models on the job, which were virtually indestructable. They didn't have much power, smoked like a chimney, and were drag-limited to 111 mph
-- nevermind on that last one: most public-service PSDs had a governor set to 85 mph which caught me by surprise on the Volunteer Department's new E-550. Out on the Interstate, it just topped out, and you'd get passed -- with the lights and siren! But then you were stuck. Like the Crown-Vic "Police Interceptor" Police car, Ford had the corner on the ambulance platform market. You could get a GMC (rare), or even upgrade to a huge Freightliner Medium-duty unit, but the latter was very costly. Many departments are forced to buy Ford.
LSS: Ford hasn't lived up to its claims of better FE with the PSD over their V-8s, the reliability, and lack of service excellence. Granted, it's not going to get stellar FE, but it should at least do better than similar V-8s, which I understand they do not.
RH77