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Old 06-23-2008, 02:01 PM
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400 hard to start when cold

i'm a newbie so i've got an easy one...i've got a 400 with duel edelbrock carbs (elec. choke), it has been sitting for about a year. i've done all the basic stuff, fresh gas, some carb cleaner. it takes a while to get it to start cold. it will crank maybe 6-10 times before it will turn over. once it gets going it runs great. it will start right up again no problem if it is still warm. but if it sits again for a few days, it takes awhile to start it again. any ideas where i should start? thanks in advance.

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Old 06-23-2008, 02:43 PM
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Change the intake to a single carb or stand on the gas when you crank it. It sounds like it is flooding .
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Old 06-23-2008, 02:53 PM
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that is the odd thing, it's acting like it's flooded, but i'm not even pumping it...
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Old 06-23-2008, 03:05 PM
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Quote:
Originally Posted by zoc65
i'm a newbie so i've got an easy one...i've got a 400 with duel edelbrock carbs (elec. choke), it has been sitting for about a year. i've done all the basic stuff, fresh gas, some carb cleaner. it takes a while to get it to start cold. it will crank maybe 6-10 times before it will turn over. once it gets going it runs great. it will start right up again no problem if it is still warm. but if it sits again for a few days, it takes awhile to start it again. any ideas where i should start? thanks in advance.
Two things to check, they go in opposite directions. Check the cold choke setting, either to tight which nets too much fuel not enough air, or too open which nets too much air not enough fuel.

OR

After it sets awhile without use, the fuel is escaping the float bowls, evaporation or leakage. The engine than will be reluctant to fire till the fuel pump refills the bowls. There are two symptoms with this.

- First if evaporated, cranking is usually accompanied by brief a light off from the accelerating pump if you push the pedal a couple times then nothing. This is usually from the carb cooking on a hot engine, boiling the fuel out to the surrounding atmosphere. An insulator between the carb and manifold usually stops this kind of problem.

- Second, if the fuel is draining into the engine it may prove to be rich till cranking clears the excess out, then it will light off. This is usually the result of either fuel boiling off as above but then running into the engine from the bowl vent. Or draining from the bowl into the engine thru a crack, loose part, or break in the carb leading into the manifold.

Bogie
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Old 06-23-2008, 03:08 PM
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Is the choke closing all the way and on the second carb are the throttle plates closed all the way at idle. If not you may have to much air getting in. Hard start when cold is usually due to a choke malfunction. Next time it is cold, before you crank it, pump it 3 ro 4 times and see if it fires up. You could also have a carb that is leaking internally and running dry so it takes a few cranks to get fuel into the engine.

Chet
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Old 06-23-2008, 05:19 PM
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Edelbrock carbs are famous for having the fuel in the fuel bowl evaporate on you. The fuel bowls are dry. if you have an electric fuel pump, turn it on to refill the bowls first.
If you have a mechanical fuel pump, add a electric helper pump at the back of the car near the fuel tank.
Wooden carb spacers will reduce the heat transfered from the intake manifold to the carbs. Restricting and or blocking off the manifold plenum exhaust heat passage at the intake gasket (low rise dual quad manifold) will reduce the overall manifold plenum temp and reduce the tendancy to boil/evaporate the fuel out of the bowls.
Install a "Seals-It" heat isolating fuel pump gasket and bolt set.
Reroute all fuel lines away from the exhaust and or shield/insulate form excessive heat.
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Old 06-24-2008, 07:56 AM
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+1 FBird ^^^
Quote:
it will crank maybe 6-10 times before it will turn over.
Wait a while. How can it be cranking and not turning over??? Do you mean it turns over 6-10 times before firing? Pour a splash into the carb and crank it after it has sat it's spell. Sounds like once it sits fuel is evaporated or leaked out. If you put that splash in and it fires right away and dies you'll know.
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