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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 233 (Engine Control System - Trouble Shooting - No Codes) >> Symptom Diagnosis >> Backfire >> Engine Mechanical Checks

Engine Mechanical Checks

WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check for any of the following engine mechanical problems:
    • Any broken or weak valve springs.
    • A low compression.
    • Any sticking or leaking valves.
    • An incorrect valve timing.
    • An incorrect or worn camshaft.
  2. Check the intake and the exhaust system for casting flash or other restrictions.
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