rhino,
What oil has Inteco been using on your trooper? I've seen them use IGMO sae40 on a trooper- this can damage the common rail and cause smoke.
If you're running up mileage mostly on the hway, then use Petron A/T synthetic oil since this can last til 10Tkm- but replace Vic filter every 5Tkm. I've been using my Vic oil filter til 5Tkm but mentioned the 3Tkm change for "extreme use", ie, purely city driving.
Also suggest you have the engine diagnosed at Isuzu Pasig or Alabang. They have a Tec2 computer, specific for the trooper, that will read all the vital engine sensors. They usually send the printout to Isuzu Phils for detailed interpretation. I just had mine checked, got a printout- the info, from more than 30 points, ranges from rail oil pressure, idle fuel quantity, accelator position, coolant temp, EGR pressure, even fuel temp. The data given shows typical readings and actual readings at idle and 2500rpm- don't think Inteco invested in such a computer.
On smoke belching: isuzu says the trooper's catalytic conv can't take water so they remove the muffler section and clean it out with water and soap- much reduced smoke emission.


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