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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1374 (Vibration Symptoms Diagnosis And Correction) >> Diagnostic Information and Procedures >> Engine Order Classification >> Other Engine Order Classification

Other Engine Order Classification

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
  1. Multiply the engine speed (converted into Hz) recorded during duplication of the disturbance by different possible order-numbers (other than 1 [first order] or the number used to determine the firing frequency of the engine).
  2. Compare the dominant frequency (Hz) recorded during duplication of the disturbance with the other possible engine orders just calculated, to determine if they are related.
  3. If the dominant frequency (Hz) recorded during duplication of the disturbance and one of the other engine order frequencies (Hz) just calculated ARE related, then an engine related disturbance of that order is present. If an engine related disturbance is present that is NOT related to first order or firing frequency, then it could be related to an engine driven accessory system. Proceed to Engine Driven Accessories Related to Engine Order.
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