GM Blazer/Jimmy/Typhoon/Bravada 1983-1993 Repair Guide

Engine Speed Oscillates at Idle

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When the engine idle speed will not remain constant, check for the following, as necessary:

  1. A faulty fuel pump.
  2.  
  3. A leaky Exhaust Gas Recirculation (EGR) valve.
  4.  
  5. A blown head gasket.
  6.  
  7. A worn camshaft.
  8.  
  9. Worn timing gears, chain or sprockets.
  10.  
  11. Leaking intake manifold-to-engine gasket.
  12.  
  13. A blocked Positive Crankcase Ventilation (PCV) valve.
  14.  
  15. Overheating of the cooling system.
  16.  
  17. Fault with the computerized engine control system.
  18.  

 
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