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Old 08-29-2006, 06:08 PM
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Holley problem

This problem has got me! I will try to keep it short! I bought a Holley 850 double pump NEW for my 80 Camaro 454BB! For 6 months it was great. Then it started idling rough and fuming me to death! I replaced power valves, no luck! The engine was not happy! I decided to do a refresh! I got it back together and the idle is great but when I stomp on it, smokes the tires for 3 feet then acts like it ran out of fuel! Falls flat and if I pump the gas when this happens, it will try to recover but then stalls out! Try to restart engine at this point and it don't want to restart, just pop, pop pop pop pop then dead! Wait for an hour and it starts up like nothing happened! But the same thing happens again if I nail it! NOW, I have replace the carb with an Edlebrock 800 cfm carb and it runs great (a little lean) with the exception that I don't have the bottom end power that the Holley gave me! A little back ground, I have a Holley blue electric fuel pump that is 5 years old, a 3/8 inch fuel line and a large fuel filter! I don't suspect the fuel system because it runs good with the Edlebrock on it! I have followed all the instructions from Holley for the rebuild and adjustments! I don't understand why it ran great for 6 months! Give me some suggestions! Thanks!

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Old 08-29-2006, 06:38 PM
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Deal with it as if it was actually 2 two barrel carbs.Disconnect the rod actuating the secondaries,experiment and sort out the front half.It is easier this way.Then reconnect the other half and move on.Good luck.
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Old 08-29-2006, 08:35 PM
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what the heck did you do? sounds like you need to start all over.

when you did the rebuild did you clean out all fuel and air passages with cleaner and compressed air?

did you install new gaskets?
did you properly set the float levels? have you checked them lately?
are you sure the power valves are still not leaking?
do both shooters work? check that.
sounds like the idle circuits are working. did you clean out the transfer slot passages in the main body?
did you clean out all passages in the metering blocks and/or metering plates
are you sure you got the gaskets between the main body and metering blocks installed correctly?
is the linkage between primary and secondary installed correctly. are the secondaries opening when they are supposed to?
did you check for vacuum leaks? what vacuum reading do you have at idle?
do you have a gasket between the carb and the intake? how about between the carb main body and the throttle assembly?
are all the vacuum ports connected properly (or plugged)?
is there a vacuum advance hose connected to your distributor? check that.

let me know what you find out.
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Old 08-30-2006, 10:12 AM
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Verify your not losing fuel pressure or igntion timing
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