Hi sir, its been a while

how is the weather down south IN CDO ?? just like Aki said check your air filter and hoses first, since your road condition there is not that all good your filtering is somehow in peril, adjusting or recalibrating your injectors would be my last option
i made a list before sa NCP site as a reminder for those who had LIMP MODE issues:
1.AIR FILTER
2.SENSORS - MAF / BOOST/ FUEL PRESSURE /AIR FLOW - better spray this with a contact cleaner, surprised gaano kadumi mga terminal nito.
3.SUCTION CONTROL VALVE /HOSES- make sure to check all vacuum hoses that leads from the Boost Solenoid to the turbo for leaks
4.FUEL PUMP/ QUANTITY CONTROL VALVE - BETTER HAVE THIS CHECKED ALSO
5.FUEL PRESSURE SENSOR
6. PRESSURE RELIEF VALVE
7. HOSE - CHECK ALL HOSES FOR LEAKS, if you see some oil residue on the end part of the hoses it means may tagas yun and you need to replace the clamps or re fit the hose properly.
8.- TURBO - if cold enough you can perform the checking yourself, detach mo lang yung intake and galawin mo yung shaft, move it up and down, left to right,pull and push dapat very minimal play( forward -backward /left - right)
9.GROUNDING WIRES - minsan we neglect to check this , madami ito sa ilalim ng air box, stranded wires na naka dikit sa body ng navara and yung sa negative ng battery meron din isa doon
10. Intercooler- once in a while dapat itong linisin from oil deposits and dirt na naiipon dito, a good degrease will do with pressure washer and blower, just make sure tuyo na siya before niyo ibalik mga hose.
AND ALSO YOPU CAN TRY RESETTING YOUR ECU:
Resetting ECU and FUEL pump MAY help in cutting down on that horrible tapping noise that the D40 suffers from.
carry out this reset and the engine is alot smoother, more responsive, less smokey and alot less tappy.
To carry out the reset carry out the following
Turn ingnition on so all dash lights come on.
Wait 3 seconds
PUMP accelerator pedel 5 times within 5 seconds....
with foot now OFF accelerator wait 7 seconds...
After 7 seconds press and hold down accelerator pedel for 10 seconds...
Atfer 10 seconds the Engine Managment Light will start to flash, at this point remove foot from accelerator.
the Nav is now in diag mode, so let the EML flash for a bit. the press and hold the acclerator pedel down for more than 10 seconds..this will then reset ECU and fuel pump etc......and put them into learning mode.
NOTE: When the EML light is flashing, this is listing possible fault codes... so if you know how to read the fault codes or know the sequences then you can figure out any possible faults with your Nav with out getting the dealer to do it!!
attention to all those who have race chips installed, alisin niyo muna