GM Astro/Safari 1985-1996 Repair Guide

Backfire (Exhaust Manifold)

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When the engine backfires through the exhaust manifold, replace or repair the following items or systems, as necessary:



Leaks in the vacuum hose system.
 
Leaks in the exhaust system.
 
Faulty choke adjustments or operation (carburetor equipped).
 
Faulty vacuum diverter valve.
 

 
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