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JUST REPLACED CARB ON MY 1992 CHEVY SILVERADO WITH A 4.3 LITER. NOW IT STARTS AND RUNS FINE UNTIL IT WARMS UP THEN DIES AND WONT START FOR 30 MIN

HAS A HOLLEY 4 BARREL WITH ELECTRIC CHOKE. COULD IT BE THE CHOKE OR THE AIR TO FUEL MIXTURE? RUNS GREAT TILL IT GETS WARM

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How many rpm's is it running at when you first start it up and it is running on the choke? Does it gradually start to idle back and then start to die r does it do it all of a sudden and dies?

When running with the choke on, it is on the high idle circuit of the carb, as it warms up the idle should slow down and then idle in the 800 rpm range in Park, 650 in Drive. This will be the low idle circuit range. This transition inside the carb will cover an idle air bleed hole in the venturi of the carb and lean out the mixture. If you notice that the carb smells gassy and black rich unburnt gases are coming from the tailpipe, the problem is located within the carb and requires a carb tech to do a rebuild of the carb. You could try a good carb cleaner like Lucas by putting it into the gas tank, in case you just got a bad tank of gas, but that is just a bandaid for a more deeply rooted problem. Get the carb rebuilt?

Posted on Nov 27, 2013

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SOURCE: Just installed a 4 barrel Holley on my 1992 chevy

Many of such carbs required an insulator plate under them to keep from boiling the fuel out. Check with the junkyards.

Posted on Nov 21, 2013

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