Holley 32/36 DGAV

I've got everything hooked up except for a vacuum port on the back of the carburetor. I have no idea where it goes or if I just plug it or what? Whenever I start the car it squeals pretty loud from that spot. I know the sound is a vacuum leak and I'm pretty sure that its from that port, but I don't know if i should hook it up or just plug it. Anybody else have this carb and know what I'm talking about? It's the holley version of the weber 32/36 DFEV with the electric choke. It came off of a mazda pickup if that helps. Either way, any info would be great. Thanks

just plug it off for now, but you should only have vacuum for pvc, brake booster, and vacuum advance.

I have almost the same carb for sale in the trading post, but I put it on a car only temporary so I was not ready to sell it.
wild coinsedence too... two of the webers I have both came off mazda trucks. lol
How did you set up the linkage? notice anything different?

Pictures?
some of those Holley 5200 had a place fora decel valve, you wont need that. Also a fuel cut off solenoid, is the hole threaded?

the hole isn't threaded, it's towards the base of it on the rear of the carb. It mounts like the stock carburetor so the linkage is on the left side if you look at it from the front of the car. I'll give plugging it a shot and see what happens. I planned on using the stock linkage to hook up the cable. I'll definitely try to get some pics for you tonight or tomorrow morning. I figured you would have some info about this carb, I remember reading in a few holley threads that you have experience with them.

alright, the squealing is coming from inside of the carburetor, I plugged that port on the back and it's still howling. Would something in the carb that's clogged make a continuous high pitched squealing sound? I'm severely out of ideas for this.

Sounds like something is not sealed, and you've got a bit of a vacuum leak. Get a bit of starting fluid and spray it around the base of the carb and see if the engine's idle changes at all, if so it's sucking the fluid in and leaking. I bet it's one of your adapter plates.

Alright, I'll give that a shot in the morning, hopefully its just that and nothing too hard to track down.
I was fiddling with the screw on the back of the carb towards the top and noticed that when I unscrewed it the squeal would go away but the car would start to die and when i screwed it back in the squeal would get louder but the idle would smooth back out. Any ideas?

you need to change the idle jet size most likely if there is not a vacuum leak.
I was surprized the carb mounted with the linkage on the left side since most Hollleys are arse backwards, which is no problem . Just make sure the secondary barrel lined up (larger one with the correct hole in the manifold.

Alright, I fixed the vacuum leak, it was at the base adapter plate so I just had to tighten it down a bit. Everything seemed to be going well yesterday, I didn't have the linkage done but I could start to car and have someone outside give it a little gas to get going. It idled at about a thousand which isn't a big deal, I hadn't really done anything to the idle settings. Now today I go to start it and a bunch of gas vapor shoots out of the secondary, just a quick POOF. So I'm like wtf, I go give it a pinch of gas then flip the choke plates down and go to start again. It's starts but is pretty rough, so I figure it's just cold, go to give it a little gas and a quick burst of flame shoots out of the primary. Nearly takes my eye brows and leaves me too scared to do anything else with the car. Can anyone help me out? Also, while my friend and I were working on the linkage last night I'm pretty sure that we flooded it by fiddling around with the throttle linkage, I figured it would be fine today. Was I absolutely wrong about that?

Well ... Mr Awesome :)
the engine needs to be warmed up some before you make too many adjustments esp if the temps are chilly out.
Never hold your face over a carb when working on it with ignition. Not unless you know the car isnt going to backfire.
The symptom sounds like accelerator pump diaphragm or pump jet problem. Is the carb used or brand new? Doesnt matter because even a new Holley 5200 is not new since they quit making them, the diaphragm could have got too stiff on the shelf. Did you put the primary venturi over the primary hole on the manifold? that is what I was trying to say earlier, how you wound up with the linkage on the drivers side with that particular carb is a concern.

did you refer to the how to here?
a lot of questions that you could save being asked, like did you plug up the coolant hole on the carb flange under the carb? did you take special care not to turn the carb studs in while you were tightening the nuts? do you have the vacuum advance connected? :blah:

I totally forgot about the vacuum advance that I unhooked to put the linkage on. Wow, I feel like a jackass, that was my bad. Plugged it in but now I've got a loose venturi in the primary bbl. So I'm going to check out the how to on tightening it. Thanks dude.

No vacuum advance would certainly make it idle crappy but shouldn't cause any backfires. Flooding might though. If the carb isn't tuned right for the engine it could very well be running too rich.

Also, try not to work the throttle too much when the engine isn't running. Whenever you open the throttle the accelerator pump squirts in extra fuel. Which could cause it to flood.

C|

The venturi in that carb, man I wish you had some pictures cuz some of those had booster venturies, more than one on some models.
They just set in the top there and are supposed to be spewing fuel downward, sometimes they flip around and will spew down the side or even upwards. The only thing that really holds it is a small staked spot and the tophat.
How is it loose?
The vacuum advance being off could have caused it to spit back esp if it was cold. Not enough advance at off idle would make the engine not want to take any gas very quickley.
Spitting back normally is an indication of being lean isn't it Cygnus?

Quote:

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Originally Posted by roodoo2

The venturi in that carb, man I wish you had some pictures cuz some of those had booster venturies, more than one on some models.
They just set in the top there and are supposed to be spewing fuel downward, sometimes they flip around and will spew down the side or even upwards. The only thing that really holds it is a small staked spot and the tophat.
How is it loose?
The vacuum advance being off could have caused it to spit back esp if it was cold. Not enough advance at off idle would make the engine not want to take any gas very quickley.
Spitting back normally is an indication of being lean isn't it Cygnus?

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You're right, I got that backwards. An intake backfire would be from running too lean. Being cold would make it worse.
Anyway, keep a fire extinguisher handy.

C|

Quote:

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Originally Posted by roodoo2

The venturi in that carb, man I wish you had some pictures cuz some of those had booster venturies, more than one on some models.
They just set in the top there and are supposed to be spewing fuel downward, sometimes they flip around and will spew down the side or even upwards. The only thing that really holds it is a small staked spot and the tophat.
?

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To reiterate what I said, they should be shooting the fuel downward only.

I finally took it on a test drive today, the choke doesn't seem to be working but I'll deal with that once I've finished the cable holder bracket and get the proper jetting done. Either way, it's awesome but I can tell its just a little bit too rich. As far as I can tell the jets all look like stock weber sizes for the 1955cc. Wouldn't a slightly bigger air correction jet for each bbl make the mixture a little more lean? Thats what I'm thinking.