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Home >> Ford >> 1990 >> Bronco II 4WD, Standard, M5OD-R1 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Diagnostic Procedures >> Fuel Pressure Check >> Injector Check
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Injector Check

  1. Connect tachometer to engine. Run engine at idle. Disconnect and reconnect injectors individually. If engine speed drops at least 100 RPM momentarily, injectors are okay. RPM drop should only be momentary as ISC will attempt to re-establish correct idle RPM.
  2. Replace any injectors that do not cause sufficient drop in engine speed. When test is complete, turn engine off. To check curb idle, refer to emission control specifications on decal in engine compartment or SERVICE & ADJUSTMENT SPECIFICATIONS article.
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