Isuzu Elf Truck 4HL1 Here are the common causes of❗ low power ❗on an how to check them one by one: ✅ 1. Clogged Fuel Filter Symptoms: hirap humatak, nanginginig pag akyat, minsan namamatay Fix: Replace primary and secondary fuel filters Bleed fuel system after replacement ✅ 2. Weak or Dirty Injectors Symptoms: usok itim/puti, uneven idle, low power kahit todo gas Fix: Injector cleaning If high mileage → have a shop do nozzle calibration Check for leaking return lines ✅ 3. Low Compression (Valve