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My 2000 Isuzu nqr cranks over great but wont start,i'm getting fuel to the filter but not to the injectors

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Big NQR TRUCK what model NQR 200, 300, what?
. what displacement engine, how many cylinders.?
Diesel right they only had gas in 1995 i think,
so is it direct injection (fuel rail direct?)
there are over 12, model H engines. 4Hxx all 12 are DI direct Inj.
so DI engines, have a ECU that injects. (much like modern gas engines,and huge injector pressure. , compared to port inj.)

  1. check fuses first.
  2. scan the PCM yet. ? that is 2nd, and mandatory.
  3. fuel pressure good (tricky on Direct injection read the FSM yet)? Some engines have sensors here to see pressure, scanned
  4. the PCM needs crank signals to inject. and reports them if bad.
  5. the glow plugs work? i check voltage then use my current meter amp clamp tool to be sure all suck spec, current, if not fix that.

post real engine names.
and country

or google, "diagnosing direct injection"


Posted on Apr 22, 2015


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