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

Backfire - Exhaust Manifold

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When the engine backfires through the exhaust manifold, check for the following, as necessary:

  1. Leaks in the vacuum hose system.
  2.  
  3. Leaks in the exhaust system.
  4.  
  5. Faulty choke adjustments or operation (carburetor equipped).
  6.  
  7. Faulty vacuum diverter valve.
  8.  
  9. Fault with the computerized engine control system.
  10.  

 
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