GM S10/S15/Sonoma Pick-Ups 1982-1993 Repair Manual

Backfire-Intake Manifold

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



Incorrect ignition timing.
 
Incorrect operation of the choke (carburetor equipped).
 
Choke setting (initial clearance) too large (carburetor equipped).
 
Defective Exhaust Gas Recirculation (EGR) valve.
 
A very lean air/fuel mixture (carburetor equipped).
 
Fault with the computerized engine control system.
 

 
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