Sir Dieseldude,

I have a 1995 A/T Pajero with 4M40 engine (Japan unit). It is about to reach 160,000 kms this year. I regularly replace my engine oil, air filter, oil filter, and fuel filter every 5000 kms. Turbo is ok, rebuilt 4 yrs ago, wala naman leaks. So far, the condition of the car is ok, one click in the morning, no idling issues, never been calibrated and replaced timing chain. Napapansin ko lang na medyo malakas na konsumo (estimate ko is 6 to 7 kms per liter) and medyo struggling on ascents and reaching 100 kph.

Since I want to avoid future problems, I just need your professional advice regarding the ff.:

1) Is my nozzle tips due for replacement already? Is this one of the reason for high f/c? It depends on the nozzles' spray pattern.

2) Since my timing chain is not yet rattling, adviseable ba na palitan na to, including tensioners and sprockets? If I were you, I won't replace it.

3) How about injection pump, would you suggest to calibrate it already kahit na wala hard starting or smoke belching (but mine emits smoke under load...3k rpms or more)? Would calibration at this mileage recommended, to improve my f/c, acceleration, etc. May isa kasing Zexel shop na nagsabi baka kinakapos ng fuel delivery yung pump kaya nahihirapan sa rekta....would you agree on this? Your engine may be starved of air. Check your air filter and turbo boost pressure first,

4) Is it possible to test injection pump performance without taking it out of the engine? No way..

5) My friend said that Japan 4M40 and its rotary injection pump is slightly different from the local 4M40, ano po ba ang pagkakaiba nito? Do you have calibration data for Japan units? Yes we have it, we have a complete set of Zexel calibration info.

Thank you very much. Hope to visit your shop one day.