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Old 12-27-2007, 03:37 AM
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rochester dualjet help

Well its been a long time between posts but I am back and the 78 camaro is still running.

I got the heater fixed and got lucky with that as I didn't have to take the core out. I did have to take the fender well off as some one had crimped the hose clamp down to tight on the copper outlet pipe of the heater core and that was letting water get by the clamp.

Any way I need to get this stalling problem figured out. I am hoping it is not a vacuum leak as they sound hard to track down.

My hot temperature idle is 900 rpm. My cold temperature idle is 1400rpm. Both rpms are when in neutral. The maximum temperature displayed on my temp gauge is 120 in the summer and 110 in the winter. The motor is stock from 78

Now the symptoms.

From a stop I have to apply the gas very slowly or it starts to die. If I apply just a bit to much gas and leave my foot where it is the rpm's drop and then after a second or two picks back up and the car starts getting up to speed as it should.

When I apply the gas while driving the rpms drop down a little and then start rev'ing up to where they should be. That usually takes a second or two.

Well I hope some people can give me some ideas as to where they would start and what they would do. Thank you in advance.

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Old 12-27-2007, 07:36 AM
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Carb probably needs rebuilt, sounds like the accelerator pump.
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Old 12-27-2007, 08:15 AM
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Sorry I forgot to mention I rebuilt the carb a year or two back and replaced the rubber for the accelerator pump and even after that it still did the same thing. That was originally why i did it was to try and fix this problem.
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Old 12-27-2007, 08:44 AM
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rochester dualjet help

did it have the check ball in the carb for the pump

Last edited by burnt olds; 12-27-2007 at 08:47 AM. Reason: posted twice
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Old 12-27-2007, 08:44 AM
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rochester dualjet help

can you see the gas squirt into carb when you pump the gas ?
also you need higher temp for the engine to work right
160 - 190 degree temp
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Old 12-27-2007, 09:16 AM
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How many miles are on this carb? If the mileage is high chances are the throttle shaft is worn out causing a vacuum leak. There also could be a vacuum leak at the intake gaskets, years ago when I had a small block with a warped intake the symptoms were the same as yours. In many cases when a dualjet goes bum the best thing to do is replace them, seen many rebuild them and the carb never works right there after. I would get a vacuum gauge and check the reading and see how much the needle bounces, this will tell you alot right away.
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Old 12-27-2007, 10:16 AM
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The temperature I figured was low considering the gauge goes to 210. Do you think some one put the wrong thermostat in?

I have a holley 4150 siting in the garage that I have wanted to put on for a long time. Problem is getting the spare cash for the intake manifold to fit it.

Where do you hook a vacuum gauge up at? I think auto zone still does there tool rental thing and worst comes to worst I can try and buy a vacuum gauge.
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Old 12-27-2007, 12:06 PM
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Pull the air cleaner ,look into the carb and move the throttle you should see gas immediatley discharged from the shooters.Could be a linkage adjustment needed on the pump.It should run between 195 and 210 degrees any less is to cold.
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Old 12-27-2007, 12:42 PM
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Thanks for the info. I have tried reving the motor in park and it revs quick with no hesitation. It only seems to be when I am in drive that it does it. Perhaps I can just notice it more in drive as there is more load on it.
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Old 12-27-2007, 01:06 PM
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A vacuum gauge costs less than $20. You connect it to a manifold or full time vacuum source, there are several on the carb. I`d think the acc. pump is okay since it don`t stumble in park, usually when the acc. pump is bad it stumbles all the time. If you want to change carbs and intakes, look on ebay for a used edelbrock performer or the like. I would change the thermostat as recommended, it sounds like yours is missing or it`s stuck open. Replace it with a 180 degree thermostat.
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Old 12-27-2007, 01:32 PM
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Ok can do about the thermostat. I will try and pick up a vacuum gauge this pay and see what I can find out.
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