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Carburetors Carb discussion and questions. Upgrading your Third Gen's carburetor, swapping TBI to carburetor, or TPI to carburetor? Need LG4 or H.O. info? Post it here.

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Old 11-09-2002, 02:34 PM   #1
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Choke, problems on quadrajet rochester

Ok, I posted in the general Engine category, and figured out what I think the problem is.

since the temperature dropped below freezing recently, I went out to start my car, started right up, then died 3 seconds later. Looked at the carb looked like It was flooded. Let it dry out started it the next day same thing happened. Then I tried to hold the gas down so that the engine would get warmed up and idle, but as I held the gas down the engine slowly started to go down in rpm's and died. I was told to change my choke.

when I go out to start it up its closed all the way, then when it dies its closed 75% of the time, which way should I change the choke coil? make it more prompt to want to close? or make it more prompt to want to open?


during the summer car was fine then it became cold


thanks for help in advance
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Old 11-09-2002, 06:05 PM   #2
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I'm wondering if you have a different problem. When the engine starts, a vacuum "pull-off" should open the butterfly slightly. Is this happening? It will only do this while the engine is running, because it needs the vaccum. The device is located on the front passenger side corner of the carb (on most of them - some have one on the rear passenger corner).

A bad pull-off would keep the choke closed too much after the engine starts, which would flood it. Take a look and see if this is working, and let us know.
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Old 11-09-2002, 10:39 PM   #3
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I think that might be on the other style of carb, I have electric one, not sure but will go out and look at it.

but while starting it up, if i had someon hold the choke all the way open would that garuntee me not allow it to flood?
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Old 11-10-2002, 10:10 PM   #4
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The "electric" part of the choke is that 12v is applied to the choke thermostat bimetal spring to warm it up in a consistent fashion. Both electric and hot air style chokes have the vacuum pull-off.

If you don't have a vacuum pull-off, that's a problem.
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Old 11-15-2002, 09:51 AM   #5
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I had a hell of a lot of problems with my rochester q-jet, the threading for the internal filter was shot, celanoids were bad, etc. I just bought a rebuilt, maybe you should look into it. Napa had one in stock for like $230. I had celanoid problem again but had it fixed and it finally works properly. Could the linkage for the accelorate be bad?
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Old 11-15-2002, 09:51 AM
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