ARMY TM 9-2815-253-24 AIR FORCE TO 38G1-93-2 MARINE CORPS TM 2815-24/3 Table 3-2.  Troubleshooting  Continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 8.  EXCESSIVE OIL  CONSUMPTION. Step 1.  Check for oil leakage. a.  Inspect engine for oil leaks.  If no leaks, do Step 2. b.  Repair or replace defective components. Step 2.  Check for blocked air intake system. Remove blockage as found.  If no blockage, do Step 3. Step 3.  Check for defective intake or exhaust valve seals or valve guides. a.  Repair or replace defective components.  Refer to paragraph 3-27. b.  Disassemble and inspect valve seals and guides.  Refer to paragraph 3-27.  If not defective, and trouble persists notify next higher level of maintenance. 9.  LOW OIL PRESSURE. Step 1.  Check for improper grade of oil. a.  Refer to end item lubrication order.  If proper grade of oil, do Step 2. b.  If improper grade of oil.  Refer to paragraph 3-20.1 and change oil and filter. Step 2.  Check for engine running hot. a.  Refer to Engine Overheating, Malfunction 7, in this table. b.  If not running hot, repair or replace engine. 10.  EXCESSIVE FUEL CONSUMPTION. Step 1.  Check for leak in fuel system. a.  Check fuel system for leaks.  If no leaks, do Step 2. b.  Repair fuel system. Step 2.  Check for blocked air intake system. Remove blockage as found.  Refer to End Item Maintenance Manual.  If no blockage is found, do Step 3. Step 3.  Check for defective fuel injectors. a.  Remove and test fuel injectors.  Refer to paragraph 3-17.  If not defective, do Step 4. b.  Replace fuel injector(s).  Refer to paragraph 3-17. Step 4.  Check for loss in vacuum. a.  Perform vacuum check.  Refer to paragraph 3-5.2. b.  If no loss in vacuum, do Step 5. 3-5