Turbo problems

Turbo: It forces air into the engine so that the combustion can take place. It is very common in cars with Diesel engines.
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Hard to start and black exhaust smoke

Mazda CX-7 2007 Turbo 250000 miles
Originally an engine light came on. Been trying to fix with a mechanic for 4 months.

Plugs, coils, sparks all replaced, #3 injector replaced, good compression on all injectors. Cylinders replaced.

No codes
New intercooler, new turbo (plenty of boost)
Timing is good, whole engine is good, good fuel pressure. Could it be the computer or is it something else?
Elsa from Australia 2 months ago  
EL
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