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I have a "popcorn" sounding popping noise coming from my exhaust system, only when I let off the gas. Not when accelerating. I have no obvious exhaust leak, but sometimes getting a smell possibily from a "too rich" running carb. I have a 650 holley four barrel on a 350 67 Camaro. I brought the car down to a friends garage, put it on the computer and adjusted the mixture, it seemed to work for about 5 miles down the road and then started back, popping. Any ideas??
 

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When the engine backfires on deacceleration it is usually an exhaust leak. If you have headers thats the best place to look for a leak. I also find holloy carbs really tempermental, when they work they work great, but you are always adjusting. <BLOCKQUOTE>quote:</font><HR>Originally posted by Barry67:
I have a "popcorn" sounding popping noise coming from my exhaust system, only when I let off the gas. Not when accelerating. I have no obvious exhaust leak, but sometimes getting a smell possibily from a "too rich" running carb. I have a 650 holley four barrel on a 350 67 Camaro. I brought the car down to a friends garage, put it on the computer and adjusted the mixture, it seemed to work for about 5 miles down the road and then started back, popping. Any ideas??<HR></BLOCKQUOTE>
 

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Check for exhaust leaks.. I know I have an exhaust leak and my car does it really bad. My carb isn't rich either so check for exhaust leaks. Are you running headers or manifolds? good luck
 

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u probably had to much gas and gas fouled your plugs change your plugs thatll fix it probably cause if it is popping out of the carberator its not firing right it comes out the carberator cause thats the only way out my guess is a plug.
 
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