Holley carb help

bosshoff · Apr 7, 2011

My 73 White Pig is under construction. It has no dash, but it will move under it's own power. It is obviously not on the road. I had to switch storage buildings, so I fired it up. It has been sitting for a year or so. Last time it ran, it ran OK, but not great. Now, the Holley 670 Truck Avenger carb will only allow the engine to idle. If you apply the throttle, it dies. What is going on, how can I troubleshoot it. Is something stuck, clogged, etc.? I know jack-squat about carbs, be kind.

broncoman805 · Apr 7, 2011

Sitting for a year the gas could go bad. If you don't have alot of gas in the tank add 5 gallons of new gas to it and it should flush the system while running. Use Sabil gas additive when storing for long periods.

broncnaz · Apr 7, 2011

Probably needs a good cleaning best bet is to remove the carb and take it apart and hose it out with carb cleaner. usually if old gas was the issue it wouldnt even idle

Explorer · Apr 7, 2011

Sounds like accelerator pump isn't working. Look down throat of carb with it not running and you should see it squirt gas as soon as you move the throttle. Same cure, tear down and clean.

bosshoff · Apr 7, 2011

I have been pretty good about the gas issue. I sealed the tank a couple years ago, and had the truck sitting without the tank installed. Last year I added a couple of gallons of gas. At the end of the summer I added 4-5 gallons of new gas and stabil.
Where is the accelerator pump?

kayakersteve · Apr 7, 2011

I know jack-squat about carbs, be kind

Holleys are great to learn on - so get ready to dig in. The 670 will need some tuning and if you do a search here, you can find the problems unique to it. Work the forum for details. Too much to type for me.

bosshoff · Apr 7, 2011

I was hoping someone was going to tell me to tap it with the handle of a screw driver, to fix it Fonzi-style.;D I have a feeling it is not going to be something simple/easy. I looked at a bunch of Google/Holley info, and it is out of my comfort zone.

VT_Don · Apr 7, 2011

Boss, there are other systems I'd confirm before tearing into a rebuild on a reasonably new carb. I've fired up automobile engines setting over 20 years and aircraft radials that may have sat for over 50 years without addressing the carburetor.
I've seen things as odd as mouse nests in the exhaust pipe and air cleaner. Double check no disconnected vacuum lines, and electric choke operation. Easy enough to check plugs. May be surprised how a little fouling and a weak spark will ruin off idle acceleration. Let us know what you find.

bosshoff · Apr 7, 2011

Thanks VT Don, I will do a thorough once over based on your reminder not to assume anything.

broncnaz · Apr 7, 2011

Carbs are easier than you think dont let all you read scare you off. Get a rebuild kit and just follow the directions you'll be suprised at how easy it actually is.

Holley carb help

bosshoff

Sr. Member

broncoman805

Full Member

broncnaz

Bronco Guru

Explorer

Bronco Guru

bosshoff

Sr. Member

kayakersteve

Sr. Member

bosshoff

Sr. Member

VT_Don

Sr. Member

bosshoff

Sr. Member

broncnaz

Bronco Guru

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