Undead Sleds / Rat Rods Rule - Hot Rods, Rat Rods, Sleepers, Beaters & Bikes... since 2007!

Go Back   Undead Sleds / Rat Rods Rule - Hot Rods, Rat Rods, Sleepers, Beaters & Bikes... since 2007! > Ford Engines

Ford Engines Ford engine talk & Q&A

Reply
 
Thread Tools Display Modes
  #21  
Old 09-22-2019, 10:35 AM
bob w bob w is offline
Still crazy after all these years!
 
Join Date: Jan 2008
Location: Stillwater, MN
Posts: 10,134
Default

Quote:
Originally Posted by Old Iron View Post
All the symptoms tell me you have a vacuum leak.
Intake manifold gaskets, carb base gaskets, a vacuum line unplugged, a bad vacuum modulator or something you're overlooking.
I agree.
Reply With Quote
  #22  
Old 09-23-2019, 05:27 AM
kenny c kenny c is offline
Rusty Rat Rodder
 
Join Date: Jan 2012
Location: West Greenwich R.I.
Posts: 3,078
Default

Quote:
Originally Posted by Old Iron View Post
All the symptoms tell me you have a vacuum leak.
Intake manifold gaskets, carb base gaskets, a vacuum line unplugged, a bad vacuum modulator or something you're overlooking.
Have you tried spraying a little carb cleaner around the intake area while running to see if the idle picks up or changes?
__________________
Tetanus Tornado 49 F6
Reply With Quote
  #23  
Old 09-29-2019, 02:19 PM
Bamamav's Avatar
Bamamav Bamamav is offline
Rusty Rat Rodder
 
Join Date: Mar 2012
Location: Berry, Alabama
Posts: 5,000
Default

After spraying starting fluid all around the intake, carb, and blocking all vacuum ports, it looks like the carb spacer is not sealing. One spot when I spray it dies, does it every time. Going to get new gaskets or make some and try again.
__________________
2019 Undead Sleds Calendars available here--
https://www.zazzle.com/2019_undead_s...18503957825055
Reply With Quote
  #24  
Old 09-29-2019, 04:59 PM
Old Iron's Avatar
Old Iron Old Iron is offline
Rusty Rat Rodder
 
Join Date: May 2011
Location: Willard Mo.
Posts: 12,322
Default

If you have an adapter under the carb make sure it seal if not get a steel plate that goes between the adapter and the manifold.
Reply With Quote
  #25  
Old 09-29-2019, 09:07 PM
Bamamav's Avatar
Bamamav Bamamav is offline
Rusty Rat Rodder
 
Join Date: Mar 2012
Location: Berry, Alabama
Posts: 5,000
Default

No adapter, I have a stock fiber looking spacer about 3/8" thick, not even sure where it came from or why I used it. I've got another one, not quite as thick that looks unused, maybe it's the one that came with the carb, I dunno. May just use it with a gasket top and bottom.

I think I may have found my water leak on the passenger side, it's either the freeze plug in the end of the head has a pinhole in it, or the head gasket has went away on the corner. Alternator bracket covers the freeze plug, so I'm gonna try to get it running first before I tackle the leak....
cause if the trannys no good, it all has to come back out anyway.....
__________________
2019 Undead Sleds Calendars available here--
https://www.zazzle.com/2019_undead_s...18503957825055
Reply With Quote
  #26  
Old 09-29-2019, 10:52 PM
Dr Crankenstein's Avatar
Dr Crankenstein Dr Crankenstein is online now
Rocket Surgeon
 
Join Date: Mar 2011
Location: SK CAN
Posts: 7,018
Default

I suggest you "true" the spacer before you replace the gaskets and reassemble. Chances are good, the spacer isn't dead flat on either mating surface, carb to spacer on the top, spacer to intake on the bottom.

Back when we were running a fuel funny car, our blower to manifold seal was a large perimeter o-ring. No gasket otherwise and the tolerance was small between manifold and blower, something like .009, however, spread over a much larger footprint than a four barrel carburetor...

Anyhow, out of necessity, we carried a low-tech hand operated surfacer. It was nothing more than a slab of machined aluminum plate with a pair of handles attached. Glued to the plate was a common sheet of 80 grit emery cloth. A little machinist's blue and a few strokes would tell. A few incidents proved the tool and method accurate, repeatable and good enough for 54 pounds of boost.


Dumb and memory challenged as I am, I somehow retained a few things from days gone by. I've "trued" a few surfaces using the lessons learned above... I've glued a sheet of emery cloth to my table saw's (machined flat) table and sanded the piece fore, aft, left, right, 45 left and 45 right until the rattle can paint disappeared. Low tech for sure, but flat as can be without visiting the machine shop...

.
__________________
- The distinction between psychological illness and creative thinking is wafer thin -

1937 Chevy Coupe
1938 Chevy Sedan

Photo Posting and Resizing
Reply With Quote
  #27  
Old 09-30-2019, 02:05 PM
Bamamav's Avatar
Bamamav Bamamav is offline
Rusty Rat Rodder
 
Join Date: Mar 2012
Location: Berry, Alabama
Posts: 5,000
Default

Well, that was a waste of time. New carb gaskets, different spacer, torqued intake bolts again to be sure, same $hit. Did manage to take the choke off, but still won't idle below 2000 rpm. Retarded timing a bit, no help. The sob may sit there and run 30 minutes at 2000 rpm, then again it might shut off after one minute. Tried backing off the idle speed screw, as soon as it gets below 2000, it quits. Never had one fight me this bad.
__________________
2019 Undead Sleds Calendars available here--
https://www.zazzle.com/2019_undead_s...18503957825055
Reply With Quote
  #28  
Old 10-01-2019, 07:52 AM
Old Iron's Avatar
Old Iron Old Iron is offline
Rusty Rat Rodder
 
Join Date: May 2011
Location: Willard Mo.
Posts: 12,322
Default

Take a few pics of the engine and carb at different angles and post them so we can see what you've got.
Reply With Quote
  #29  
Old 10-01-2019, 06:25 PM
Bamamav's Avatar
Bamamav Bamamav is offline
Rusty Rat Rodder
 
Join Date: Mar 2012
Location: Berry, Alabama
Posts: 5,000
Default

OK, put my Rochester 2bbl on, getting the same results. Looking now toward the HEI. Is it even possible that it could work above 2000 rpm, but be dead below that? I thought they either worked or didn't? Could be the module bad I guess.....
May try my points distributor again. Can't be much worse.
__________________
2019 Undead Sleds Calendars available here--
https://www.zazzle.com/2019_undead_s...18503957825055
Reply With Quote
  #30  
Old 10-01-2019, 06:52 PM
Dr Crankenstein's Avatar
Dr Crankenstein Dr Crankenstein is online now
Rocket Surgeon
 
Join Date: Mar 2011
Location: SK CAN
Posts: 7,018
Default

I also wonder if that's possible... do you have a weak battery and the voltage is too low, until the alternator spins up and joins in? That would make some kind of sense, I suppose...

Grasping at straws... does the distributor body ground properly at the hold down clamp? Good motor to chassis ground? Are your mechanical advance weights stuck "open"?

.
__________________
- The distinction between psychological illness and creative thinking is wafer thin -

1937 Chevy Coupe
1938 Chevy Sedan

Photo Posting and Resizing
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 11:49 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Rat Rods Rule Inc.