TM   10-3930-643-20 ENGINE,  FUEL,  EXHAUST  AND  COOLING  TROUBLESHOOTING  AND  MAINTENANCE.  (cent) 4 - 5. Exhaust   System   Troubleshooting. MALFUNCTION TEST OR INSPECTION CORRECTIVE   ACTION a. EXCESSIVE BLACK OR GRAY SMOKE. Inspect   air   cleaner   indicator. If   indicator   is   red,   clean   or   replace   air   cleaner   element   if   needed. Refer   to   paragraph   4-18. If   problem   continues,   notify   Direct   upport. b . EXCESSIVE  WHITE  OR  BLUE  SMOKE. 4-16

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