TM10-3930-660-20 Table  2-3. Mechanical Troubleshooting (Cont’d) MALFUNCTION TEST OR INSPECTION CORRECTIVE  ACTION Step 4. Check for overloaded engine. Check for added loading from malfunctioning accessories or driven units. Check for dragging brakes and other changes in vehicle loading. Step 5. Check  for  inadequate  intake  air  and  high  or  low  temperature intake air. Inspect air cleaner element and replace if necessary. Check air intake system for other restrictions, para. 5-5. Step 6. Check for high pressure fuel leak. Check for leaks in the high pressure lines and fittings. Replace components as necessary, para. 5-12. Step 7. Check for inadequate fuel supply. Check for clogged filter. Replace if necessary, para. 5-16. Step 8. Check for poor quality fuel. Check for poor quality fuel by operating vehicle from a temporary tank with good quality fuel. Drain and fill fuel/hydraulic tank if necessary, para.  5-10. Step 9. Check for air leak between the turbocharger and the intake manifold. Step 10 Check for leaks in the air crossover tube, hoses, and through holes in the manifold cover. Replace parts as necessary, para. 5-7 and 5-8. Step 11 Check for leaks in the manifold or turbocharger gaskets. Check for a cracked manifold. Replace parts as necessary, para. 5-7. Step 12 Check for excessive exhaust system restriction. Remove restrictions as needed, para. 6-3 and 6-4. 10. EXCESSIVE EXHAUST SMOKE Step 1. Check for engine running too cold (white smoke). See troubleshooting for Coolant Temperature Below Normal, Step 22. 2-32