Hummer H3:  Blue Smoke → Causes & Diagnosis

  A very common problem that affects all vehicles (including the Hummer H3) is blue smoke coming from the exhaust.  Reasons for blue exhaust smoke include bad valve seals, valve train wear in general, the PCV valve, burning transmission fluid and more. Blue smoke indicates that your H3’s engine is burning oil.  The question is … Read moreHummer H3:  Blue Smoke → Causes & Diagnosis