Carburator issue. I think

[Frank Dinatally]

Hi Everyone. My 65 barracuda is having carb issues when climbing a hill. The car starts bucking off and on . It does this to the point where it loses 35 to 40 mph on a good size climb. I think it is carb issue but really not sure. Any info is greatly appreciated. It has an edelbrock 1406 avs2 carb now
Thanks Frank

 

[Locomotion]

Off hand, check to make sure the primary float level isn't too high and/or the secondary float level isn't too low.

 

[Frank Dinatally]

Not really a mechanic. I was told once it could be floats. I am just debating service for floats or a new carb.

 

[junkyardhero]

don't just shotgun parts at it. do a little diagnostic at least. heck, it might just be a clogged fuel filter...

 

[Inertia]

Replace the fuel filter, if that doesn't cure the issue.
General tune-up might be in order if not recently done.

Good luck.

 

[George Jets]

Please define if it is a 318 or 360 engine.

Then the carburetor would be either a 1406 600 cfm, or an AVS2 650 cfm.

Past experience the AVS2 650 was too much carb for a 318, did not run well. But the AVS2 650 ran excellent when bolted on a 360.

Likewise a 1406 600 usually runs perfect on a 318 right out of the box.

Please define whar your setup is?


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[Locomotion]

Not really a mechanic. I was told once it could be floats. I am just debating service for floats or a new carb.

It wouldn't hurt to have the floats checked on any new carb as well. You never know if someone had a bad day at the factory.

 

[RustyRatRod]

If you wanna just throw something at it, I suggest a new fuel filter. Cheap and easy to change and a high probability that's the problem.

 

[Frank Dinatally]

Sorry. Engine is 273 hipo. Nothing special done as far as I know.. it ran very well for about 5000 miles. This year it started the bucking uphill on hills that are rather steep. Still runs perfect on just regular driving

 

[mbaird]

Pull over and check the plugs next time it happens . If white you ar lean ( running out of fuel) if they are black then it is flooding out .

 

[jeff alder]

Hey Frank,
Don't drive uphill anymore! Throw another carb on there just for a test drive. Swap the one off that sweet Fury? you have just for a quick test.

 

[Murray]

If carb is to be rebuilt, sink test floats to be sure they are not filling with gas.

 

[Frank Dinatally]

Hey Frank,
Don't drive uphill anymore! Throw another carb on there just for a test drive. Swap the one off that sweet Fury? you have just for a quick test.

That is my thought exactly. But I live in the mountains

 

[George Jets]

That is my thought exactly. But I live in the mountains

Makes sure your brakes work!


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[George Jets]

OK,
You still have not told us if the carb is a 1406 600 cfm

or an AVS2 650 cfm carb?

They are not the same carb, just from what you have told us so far, the AVS2 650 cfm is too much carburetor for that 273.


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[junkyardhero]

Please define if it is a 318 or 360 engine.

Then the carburetor would be either a 1406 600 cfm, or an AVS2 650 cfm.

what?!?

neither of these came with either of those carbs stock. furthermore the CID isn't beholden to some arbitrary carb size that you're just pulling out of thin air.

he says 1406 which is an entirely different type of carb than an AVS 2 which, BY THE WAY can be had in 500, 650 and 800 sizes.

 

[junkyardhero]

AVS2 650 cfm is too much carburetor for that 273.

no it's not and it's certainly not for a HiPo 273 that he's got.

 

[junkyardhero]

it ran very well for about 5000 miles. This year it started the bucking uphill on hills that are rather steep. Still runs perfect on just regular driving

this says, to me, fuel. particularly fuel pick up.

which could be any number of things, but i would start with checking the sending unit first and then move on from there.

again, this could be something wildly simple like a collapsed fuel supply line, a clogged filter or even some trash in the carb fuel bowls that gets sloshed when you head up hill.

swapping on a known, good carb will eliminate nearly half the field pretty much immediately...

 

[tonysrt]

And don't forget about the fuel pump not being able to deliver enough fuel required to supply when going up a hill. Is the fuel pump electric or mechanical? A lot of things to trouble shoot.

 

[RustyRatRod]

OK,
You still have not told us if the carb is a 1406 600 cfm

or an AVS2 650 cfm carb?

They are not the same carb, just from what you have told us so far, the AVS2 650 cfm is too much carburetor for that 273.


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He said clearly in the first post that it is a 1406. He called it an AVS, but he's mistaken. It's an AFB if it's a 1406.

 

[Bewy]

The 1406 is an AFB carb. The AVS carb part is #19XX. This is NOT leaking floats. Floats leak on level roads AND up/down hills.
What happens if you go to WOT on level road? Does the engine rev out ok? If ok, problem might be spark/electrical. Check spark plugs.

 

[Kendog 170]

If the fuel filter doesn't help, watch some you tube videos on float adjustments. It's not too intimidating.
https://www.bing.com/videos/rivervi...E995B690E28377F2251CE&&mmscn=stvo&FORM=VRDGAR

 

[Dana67Dart]

Some random thoughts....

1. Climbing a hill takes a small additional amount of throttle position. Could the secondary be opening too soon?
2. Could some electrical wires be dangling and while climbing a hill make contact and short out momentarily
3. When this happens is the fuel tank full or less than full. If less than full have you tried while the tank is full
4. The increased throttle position changes the manifold and ported vacume could the vacume advance be adding too much or not enough advance

 

[SpeedThrills]

And don't forget about the fuel pump not being able to deliver enough fuel required to supply when going up a hill. Is the fuel pump electric or mechanical? A lot of things to trouble shoot.

Float level is a good idea. But it would've done this since whenever the float was set too low. Maybe it's hanging up. I would want to know why it's hanging up; because if the problem just started, it just started hanging up.

Fuel filter is a good idea, too.

Maybe the metal fuel line got crushed? Maybe any rubber hose is collapsing (may not be visible).

The sock in the tank is clogged? Maybe decomposing?

But, when I was a youngin', the most likely culprit was the fuel pump. But these cars are so old now, some kinda cooties could be restricting fuel flow.

Could be a combination of things.

 

[Frank Dinatally]

And don't forget about the fuel pump not being able to deliver enough fuel required to supply when going up a hill. Is the fuel pump electric or mechanical? A lot of things to trouble shoot.

Pump is mechanical. Also pics of the carb. Also car ran very well since built. This just started about a month ago