With 170,000 km on the odo now (50 of that mine), I've recently noticed a dramatic drop in both power and fuel efficiency. The truck hesitates on acceleration. It also seems "noisier" than it used to be (clacking louder). My 5 speed with the identical engine sounds quiet by comparison (and has way more oomph). I'm pretty sure it is time for a turbo rebuild, but this wouldn't explain the louder diesel clacking noise. What might be causing it? Timing off? Valves? Injectors? Blown head? (just kidding ...i hope). Manifold leak? Also can anyone recommend a good diesel mech in the lower mainland area. I've heard good things about Surry Diesel Injection, any other recommendations? I'm thinking I should get a compression check and the injectors, valves and timing looked at, as well as my turbo rebuild.