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Home >> Ford >> 1988 >> Cutaway 7.3 M >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - Diesel >> Trouble Shooting >> Engine Knocks

Engine Knocks

  1. Check engine front drive components for proper operation. If okay, go to next step. If not, service or replace as necessary.
  2. Verify that engine is not overheating. If not overheating, go to next step. If engine overheats, service cooling system.
  3. Loosen each injector line nut (one at a time) while engine is running. If engine knock is isolated to specific cylinder(s), go to next step. If engine knock is not isolated, go to ENGINE PERFORMANCE DIAGNOSIS  in this article.
  4. Check injector fuel line(s) for kinks or restrictions and test injectors. See INJECTORS TEST  under TESTING. If the line(s) and injector(s) are okay, go to ENGINE PERFORMANCE DIAGNOSIS  in this article. If not, replace line(s) and/or clean or replace injector(s).
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