Holley 670 Carb - Team Camaro Tech
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post #1 of 4 (permalink) Old Apr 24th, 11, 02:54 PM Thread Starter
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Holley 670 Carb

So I bought a brand new Holley 670, and I'm having some major issues with it. It won't idle at all, or start unless I pump the gas a bunch.
Once I pump it, it will run, got about 5-10 seconds [depending on how much I pumped it] then stall out.

From what I can tell it's not getting fuel once its started, and is just running off whats in the carb then dying out.
I cant see any gas going in at idle [should I?] but it does if I rev it.
The car will run no problem if I hold the pedal down a bit, but even adjusting it to max idle via the screw it wont stay running.

I pulled the fuel line off, the pump is pumping fine, and there was pressure.
I figured I'd need a bit of tuning after it was running, but it won't even idle. I spent like two hours messing around with no avail.

I tried to adjust the float levels, but since it won't idle without being revved I can't properly tell.
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post #2 of 4 (permalink) Old Apr 24th, 11, 10:43 PM
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Re: Holley 670 Carb

Thats strange. I have the Street Avenger 670 on my car but it was on it when I bought the car. It runs pretty good and I have no complaints. They say the carb should be ready to run right out of the box. I'm not sure if you have the manual for it? How is the float bowl level? There should be sight glasses on the side of the float bowls. Or plugs that you need to remove to check the levels.

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post #3 of 4 (permalink) Old Apr 24th, 11, 11:16 PM
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Re: Holley 670 Carb

what intake do you have -spacer plate or anything--sounds like bad vacuam leak or base gasket wrong preventing idle circuit--should not see fuel at idle-if you hold steady at part throttle you should see full pulling thru ventures(center round barrels) the fuel ur probably seeing is pumping it coming out of jets-also make idle mixture screws are not all the way screwed in
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post #4 of 4 (permalink) Old Apr 24th, 11, 11:28 PM
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Re: Holley 670 Carb

Try turning the two idle mixture screws all the way in until they seat lightly and then back them out 1.5 turns. Then if you get it running you can adjust them for highest vacuum reading once it's hot.

If it's the electric choke model, is it hooked up to a good keyed 12V source? If it's got an electric choke it is not optional to leave it disconnected. The choke plate will not open otherwise.

Also look on the choke tower and there should be a four digit code stamped on it. They had a plating problem five years ago where the coating would flake off inside and clog the orifices. All those should be out of the system but you never know how long one will sit on the shelf. The four digit code for the problem carbs are 3345-3655 and 0016-1986. The last digit is the year and the first three are the days.

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