Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Holley off idle backfire problem
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Old 05-18-2013, 04:51 PM
UPandComing UPandComing is offline
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just my 2 cents on this one, iv had this problem before. you will need a GOOD timing light, and a vacuum gauge. if its a holley double pumper put 72 primary jets in it and 73 in the rear for a higher rated cam. set your squirter cam back to the original position. the vacuum gauge needs to be hooked up to the intake manifold. fire up the engine let it idle till warm. start with your idle setting, typicall you want an idle of 500-800 rpms. than after you set the idle you want to set the idle fuel mixture. on either the left or right side of the metering blocks front and rear is a small recessed screw, start on the front metering block turn the screw in clockwise (right) until you hear the engine "stumble" then back out the screw until the idles smoothes out, repeat for the rear metering block. now your carb is set...for now.. with these setting you should be able to run the car and get rid of the popping and stalling if it persists you have to considerimproper valve adjustment, improper timing etc there are many many factors that will affect the way an engine runs
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