1975 2F Piggy with Weber 38 carb and DUI dizzy...need some insight please:)

This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.

I do like your ideas of a known good carb and a known good dizzy...I just have access to neither as of this moment:/

It HAS to be one of those two right? I keep leaning towards the carburetor, but rsb can chime in as well. It sure seems to be in good shape/order. I feel friggin' dumb!
 
This is what I would do if I were in your shoes, I'd strip the whole thing back down to bare block and start over with a new dizzy and a new coil. Call the seller of the carb and tell them I was sent a defective carb and would like them to replace it with a new one. They just might! Get everything fully installed including the gas pedal and then light it up.
 
I'll try and dig up the info on where the Weber was purchased from. It came with the truck, and I know I have a receipt in the files, but it was likely purchased some time around 2008 (or early 2009 at the latest).

rsb can chime in here, but holy cow does everything seem to be pointing to that stupid carburetor.

But you mention the coil? What/where/how should I be investigating that sucker?

Side note dog: did you get that e-mail with the photo? Doable? Thoughts?
 
J did you guys check the fuel pump? flow to the carb?
 
Well the coil is part of the ignition system. It's good practice when replacing a part of a system like a new dizzy, to replace everything in that system at the same time. All I know is I was having problems with mine similar to yours and I replaced the carb, dizzy, coil, plugs, and wires and my problems went away.
You have good comp.#'s, no cracks in the intake, carb isn't leaking fuel. I'm just saying if it were me, I'd sell off the suspect parts on ebay or craigslist and put the $ towards all new parts and start fresh.
Got your email, yes , it's very doable.
 
Funny 'ha ha' or funny bang my head against the wall:)

Ill check that again today, but as far as I recall that sucker is squirting fuel like crazy when not hooked in to the regulator. I should probably get an in-line fuel pressure gauge too then huh?

My next idea was to actually video what is going on and stick it online for you guys to see this stuff. My words might be worth 5 seconds of video you know?
 
did you try taking the regulator out of the equation? how does it push after the regulator?

go right to the weber from fuel pump
 
mydogpea said:
See if rsb would be willing to pull his dizzy off his truck and install in yours, see what happens. How old is your coil?
Click to expand...

This is where I'm at jd. It seems odd that with all you have done to it and with all the tests we put it through that it continued to behave exactly the same. That is, idle smooth then stumble a bit with light throttle and then stall. The problem is so consistent, I'm forced to conlude that it's your dizzy.I have no clue how to test your DUI for this problem. Have you tried digging through mud search for anything related to those dizzies? Since your plugs are already fowled you could try replacing them with new ones appropriate for use with your DUI.

Another thing you might want to research is the coil. It should be easy enough to figure out if you have the right coil.

Another thing I was thinking, we know for certain you have a voltage drop in your system. So maybe it's just a matter of supplying a clean 12volts to your ignition system. What I'd start with is replacing the battery wires. The bat cables you are using can be repaired but you'd be better served just buying new, integrated cables.

And another thing, :mad:THANKS, DOGPEA! :mad: Volunteering my junk, thanks alot! :ban: ;)

When all is said and done jd, we might have to do this, but I'd rather see that DUI working right if that's what is wrong.
 
rsbcruiser said:
we know for certain you have a voltage drop in your system. So maybe it's just a matter of supplying a clean 12volts to your ignition system..
Click to expand...

this is a big thing...i hadnt known about that...how much of a drop? what caused you to find this out ? what did you test?

is the drop when you throttle up?

yes a dui NEEDS 12v constant with the key-on

try a temperary wire direct from battery to dui + power....(this is only temporary!!!) you must remember to remove the wire after you are done testing...you dont want 12v constantly to the hei/dui....you'll burn out your ign mod!!!

you can remove the dui and bring it to most every auto parts stor for them to test also

you could also try and remove all fuses from fues block except fueses to run and then test
 
Sorry rsbcruiser for volunteering your parts, just was figuring your dizzy is known to be "good" and a quick swap to see if jdog's truck ran better as a result. At least we would know if it is the dizzy or not. I'm thinking it and the coil is the culprits.
 
testing

from what I read we can rule out valve timing, distrib timing, so far

I am a little suspicious also of the DUI dizzy--what model is it?
since you have spark for idle I am thinking it is not that but maybe the vacuum advance

still things happen and it wouldnt hurt to cover the bases and run that 12v direct to the coil and bypass the ignition sw

if you are still thinking carb then it is either lean bogging or flooding out, you said the acel pump was squirting earlier I think

can you see if your choke is opening if you let it idle and warm up?

did you try and put your hand over the carb and block the air going in (makes it rich and compensates if the choke is inop)

also try pouring a little fuel in and see if it accels? (tool lean)

also you might want to try starting with it floored and see if it will fire at all or just turn over

keep up the good work
 
i dont know which one he has...maybe he can post up the part# from the original reciept...i do knotice that it has a black cap on it and looks to be a DUI: Performance Distributors - High Performance and Racing Ignition Systems

however...the one on the site for a toyota 6 is a blue top :hhmm:

he can bring it to any auto zone or place like that and have it tested as they do for an HEI...that would rule out the coil and ign module if it checks out.

where it was said that theres a voltage drop is interesting....as a dui needs 12 to work right






so far if i were you :) (thank goodness i'm not him i think i would loose my ramaining hair and start drinking and smoking again) I was just thinking this right? or did i type that out loud :hhmm: :hillbilly:

i would check this laundry list of things out :) doesnt matter which you try 1st...just do it :D


1) check the fuel pump? flow to the carb?

2) take the regulator out of the equation? how does it push after the regulator? go right to the weber from fuel pump

3) try a temperary wire direct from battery to dui + power....(this is only temporary!!!) you must remember to remove the wire after you are done testing...you dont want 12v constantly to the hei/dui....you'll burn out your ign mod!!!

4) you can remove the dui and bring it to most every auto parts store for them to test also

5) you could also try and remove all fuses from fues block except fueses to run and then test

6) try and put your hand over the carb and block the air going in (makes it rich and compensates if the choke is inop)

7) also try pouring a little fuel in and see if it accels? (tool lean)

8) also you might want to try starting with it floored and see if it will fire at all or just turn over




PS kidding about the drinking and smoking thing :) sometimes i like stupid humor :)
 
Last edited:
Thanks guys. Sorry for the delay today. Wife-baby-etc dominated the landscape. Soon as I get a chance I will check the dizzy make and model.

The voltage drop was checked at idle at that wire that plugs into the carb. I think it was right around 10-10.6 volts.

I can't tell you guys how much help you've been! When this is done ill owe you all huge!
 
jdog35 said:
Which components of the dizzy need to go to the shop? The cap alone or the entire unit including the spline? Sorry for being such a NOOOOOOOOBBBBB!!!
Click to expand...




Pull the whole dizzy out and take it w/ you. Then you'll have everything they might need to test it.
 
Really looking forward to the solution here. Lots of fun. I had the same issues and its good to see the troubleshooting that you have done. Mine was a bad coil. Took me forever to find it and its been good for a year or so, now its starting again so it looks like I get to print off this forum.

Good luck man
 
You must log in or register to reply here.

Share this page

Back
Top Bottom