3duce set up Ford 94 carburetors

[Gene F]

NAPA is your best bet. Tell em you want the right one, even if they have to order it. At least then you can rule something out, if it does not cure it.

 

[dmsfrr]

... I still think that if you can choke the eng. with your hand over the carb. opening with your hand a little and the eng. speed increases, or has a better smoother idle , that you have a vac. leak somewhere. do not rule out the possibility of the pcv valve being the culprit. ...

... I too am starting to be suspect of the PCV valve! ... It is threaded directly into the top of the block. ...

The PCV valve is threaded into what? The location may or may not be a bad idea. Photos please.

Remove and plug all the vacuum connections on the engine before testing again, so you can rule them in or out as part of the problem. Maybe the brake booster has a blown diaphragm? Have you checked around the intake gaskets or for a cracked intake manifold?

 

[reddog565]

Thanks for the reply! For whatever reason I'm having a difficult time uploading my pictures they just won't load. Anyways the vacuum Port is tapped at the top of the block right by the distributor next to the valve cover pan. As far as intake gaskets are concerned, I just rebuilt this motor and they're new. As for the booster diaphragm, it is also new. So everything is new on this motor. But ,as I stated previously ,I had this problem before I rebuild it. I haven't had time to install my new PCV valve yet. So I'll let you guys know how that worked out...

 

[reddog565]

So guys, having all kinds of issues LOL....
I'm trying to upload a picture of that PCV valve. I took it saved it in the file. I've tried to upload it, but when I do, it says upload failed! Anybody know what's going on with this?

 

[dmsfrr]

So guys, having all kinds of issues LOL....
I'm trying to upload a picture of that PCV valve. I took it saved it in the file. I've tried to upload it, but when I do, it says upload failed! Anybody know what's going on with this?

When you hold your cursor over a photo just before you select it, a box will open with a few details about the photo. If the file 'Size' is 2mb or larger they won't upload.
I've been using "Paint", a basic photo editing software that was in this PC to 'reduce' the images before upload. (an annoying pita)

 

[reddog565]

Was looking at post # 22. And it caught my eye, you have a wire running through that, I'm assuming then, that would be a live vacuum port?
I'm using two bolts to hold my throttle bracket. Do you think I could be losing vacuum from those
Threaded bolt holes?

 

[dmsfrr]

Was looking at post # 22. And it caught my eye, you have a wire running through that, I'm assuming then, that would be a live vacuum port?
I'm using two bolts to hold my throttle bracket. Do you think I could be losing vacuum from those
Threaded bolt holes?

Someone used too long of a bolt to fasten down the throttle bracket and broke thru into the intake runner. Then put a shorter bolt into the hole, it made a good vacuum leak.

 

[40 Deluxe]

With 20" of idle vacuum, you do not have a vacuum leak ,at least not big enough to affect the mixture at part or full throttle. If you have not blocked off the end carbs, do so! Just cut a piece out of a soda can just big enough to cover the openings and bolt the carb back down. You don't even have to make bolt holes, just snug the carb with an extra gasket. If it still runs lean find or borrow a different carb. DO NOT ASSUME anything! Test everything. No shortcuts! (This is troubleshooting 101!)

 

[Alaska Jim]

I tend to agree with 40Deluxe, if you have 20 in. of vac. at idle with steady needle on the gauge , a Vac. leak is unlikely, but, you do have a lean condition if you can still change the idle speed and quality by partly covering the top of the carb., or adding a bit of choke, as this effectively makes the idle mixture richer.

 

[reddog565]

I did block both end carburetors off. When I did that, the engine stumbled, got very angry! Did not want to run,and it started pulling oil into the exhaust causing a great deal of smoke! So I don't know what happened there... Going to install the new PCV valve tomorrow see what happens with that..


finally! got pictures resized!!!!

 

[dmsfrr]

I did block both end carburetors off. When I did that, the engine stumbled, got very angry! Did not want to run,and it started pulling oil into the exhaust causing a great deal of smoke! So I don't know what happened there....

That makes no sense, the engine should idle & run smoothly on just the center carb.
There's not enough (or any) fuel getting thru it ???
.

 

[reddog565]

Hi guys. I installed a new PCV valve. Idols a lot smoother and better. But still dealing with the bogging problem. Sow I eliminated a vacuum leak. So it's down to not getting enough fuel. I'm going to have to take that center carburetor off and take a closer look at it. I'm already running a 52 jet on the center one. And 49 on the two outboards.

 

[40 Deluxe]

Hi guys. I installed a new PCV valve. Idols a lot smoother and better. But still dealing with the bogging problem. Sow I eliminated a vacuum leak. So it's down to not getting enough fuel. I'm going to have to take that center carburetor off and take a closer look at it. I'm already running a 52 jet on the center one. And 49 on the two outboards.

If those carbs sat a long time, there could be dried crud in some internal passages. Just soaking in carb cleaner may not get that stuff out. I have had to use tag wire to run through some carbs to get that junk out.

 

[reddog565]

I totally rebuilt the carbs myself, ran wires through all the holes.so I think Alaskan Jim was right to begin with it's a lean condition I just have to figure out what it is..

 

[dmsfrr]

With the outer carbs blocked off the engine should idle & run on just the center carb. If it won't there's something wrong with that carb.
A sometimes overlooked problem is a clogged inlet filter, just inside the carb where the fuel line attaches, if those carbs have them, or maybe a stuck-shut float valve.

 

[reddog565]

still dealing with "bogging". it is absoutley a fuel "issue".
i'am running 52 jets in center carb. I want to try some
larger ones. my carbs are the "94 model". does any body
have some #54 jets & up? these must be 1/4" threads!
new ones cost about $5-6 each! if you have some good
used ones, private message me. I use pay-pal..

 

[scicala]

I just bought two #55 Holley jets from a local speed shop (these places are disappearing) for $5 for both. BTW, all Holley jets are the same thread size.
Also, weak ignition can make an engine bog under load. Make sure you have a nice blue crisp spark that can jump 1/2" before you start wasting time and money.


Sal

 

[Alaska Jim]

on my 3x2 set up in my coupe, I am running 54 or 56 jets in the center carb. can't remember for sure which off hand , as I was playing around with it last summer and changing jets back and forth in all 3 carbs for a while , I have 51 or 52's in the outer carbs

 

[reddog565]

I always enjoy hearing from you! Lord knows I wasted enough money on this car.... Asfor the spark , it's an MSD ready to run distributor. And yes I'm using the vacuum advance. 38 degrees total advance. Talk to what I would call a reputable carburetor shop.they said after the mid-60s the thread size changed from quarter inch to 5/16? Anyways I only got 52 in the center 1 and 49 in the outboards. I guess I'll get it up a little bit go to 54 in center ,see what happens?I'm totally out of options, I tried all everybody suggestions nothing's working. Thanks for keeping in touch Jim..

 

[scicala]

That's news to me. I've been doing all USA carburetors since I was 17 and never ran into two different main jet thread sizes on Holley carbs. They did change the numbering on the jets with 3 digits instead of two when the emission years started. I'm pretty sure that represented 100% jet flowing before carb assembly.
The guy at the carb shop may have been referring to Autolite/Motorcraft jet thread size (which is larger).


Sal