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Home >> Ford >> 1987 >> Cutaway 6.9 1 >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - 6.9L Diesel >> Trouble Shooting >> Engine Misses

Engine Misses

  1. Determine when engine miss occurs. Engine will miss when cold if one or more glow plugs are not heating. If engine misses only when cold, go to GLOW PLUG SYSTEM TEST  diagnosis and testing. If engine misses at normal operating temperature, go to next step.
  2. Loosen each injector line nut (one at a time) while engine is running. If miss is isolated to specific cylinder(s), go to next step. If miss is not isolated, go to ENGINE PERFORMANCE DIAGNOSIS  .
  3. Check injector fuel line(s) for kinks or restrictions and test injectors. See INJECTORS TEST  . If lines and injectors are okay, go to next step. If not okay, replace line(s) and/or clean or replace injector(s).
  4. Perform cylinder compression test. If engine compression is okay, go to ENGINE PERFORMANCE DIAGNOSIS  . If not okay, go to next step.
  5. Check crankcase pressure by performing step 20 of ENGINE PERFORMANCE DIAGNOSIS  . If okay, service or replace engine valve train. If not okay, overhaul power cylinder.
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