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91 fullsize blazer backfiring problem

  #1  
Old 11-07-2010, 12:16 PM
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Default 91 fullsize blazer backfiring problem

My 91 fullsize blazer just got new head gaskets but when started up it backfires like pop corn popping after a few minutes it will stop and truck runs fine any idea why it's popping
 
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Old 11-07-2010, 01:32 PM
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It sounds like your timing may be too far advanced for cold start up. What was the timing set to after the head gasket replacement?
 
  #3  
Old 11-08-2010, 08:02 AM
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I was not the one who set timing on the truck so I couldn't tell u off hand but all specifications came from
my haynes Manuel for that truck
 
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