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Loss of power when driving

Tiny
CAPTANRON
  • MEMBER
  • 16 POSTS
Thank you for your response merlin. There are no vacume or fuel, vacume or smoke of any color from exhaust. The float level for primaries was checked and properly adjusted. Cold start; I depress the throttle one time which sets the choke, start the engine. It runs at fast idle. As the engine warms up, it slows to curb idle. Depress the throttle and it sounds like it ran out of fuel and will die. Let off the throttle and it will idle. It will restart and idle. I havnt checked accelerator pump measurements yet or the nylon fast idle cam behind the electric choke yet.And i dont think the electric choke is adjustable. Heres some pics of what i have. This is an 4180C holley/motorcraft carburetor and it takes an Renew kit #3-1346 from Holley.


https://www.2carpros.com/forum/automotive_pictures/515762_Rons_Photos_001_1.jpg


https://www.2carpros.com/forum/automotive_pictures/515762_Rons_Photos_003_1.jpg



https://www.2carpros.com/forum/automotive_pictures/515762_Rons_Photos_004_1.jpg



https://www.2carpros.com/forum/automotive_pictures/515762_Rons_Photos_002_1.jpg

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Tuesday, March 24th, 2020 AT 2:55 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Both floats are adjustable on these, I happen to like the mechanical pumps. My old fords had nothing but mechanical. If you have a small ball peen laying around, tap the carb in several spots with the engine running, this may dislodge a small bit of dirt in the carb, if any is in it. It looks fairly new? Rebuilts do not always perform well on the first try, I had a 66 Tbird that I put 5 rebuilts on in one day! If it is a rebuild, it may not have the right jets or metering rods for the application. Have you tried the mixture screws yet? All carbs need to be matched by adjusting the mixture, Use a tachometer and adjust idle as low as possible, then obtain the highest RPM reading on both screws, then rest idle speed. If it sounds like its out of gas it may be set way too lean!
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Tuesday, March 24th, 2020 AT 2:55 PM (Merged)
Tiny
CAPTANRON
  • MEMBER
  • 16 POSTS
Heya guys. New news. My carb is an 4180C (Calif emissions) Non adjustable choke and no idle mixture screws to mess with and im waiting for a carb rebuild kit from Holley. I'll update when I install it.
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Tuesday, March 24th, 2020 AT 2:55 PM (Merged)
Tiny
CAPTANRON
  • MEMBER
  • 16 POSTS
I'm still waiting for the carb rebuild kit from Holley. The carb is a 4180C for CA. Emissions. The choke is electric non adjustable and there is no idle adjustment screws. I was thinking the power valve might be the root of the problem, even though there is no black smoke out the tailpipe. That's supposed to supply fuel per manifold vacuum after the primaries open.
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Tuesday, March 24th, 2020 AT 2:55 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
All carbs have mixture screws even this one, to get at them you need to remove the plugs that cover them. They are on the base(throttle body) of the front of the carb under the fuel bowls.
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Tuesday, March 24th, 2020 AT 2:55 PM (Merged)
Tiny
CAPTANRON
  • MEMBER
  • 16 POSTS
Heya guys! I finally got my Renew Kit from Holley today. Ya the instructions suck. The print is so small I cant read it with my triple bifocal glasses. I'll attempt to rebuild the carb sometime this week hopefully. Been pretty busy lately but i'll try keep yall updated.
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Tuesday, March 24th, 2020 AT 2:55 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
There is more to rebuilding these than puttin in the new parts. Carb rebuilders soak them in solvent for 4-6 hours while vibrating the parts.
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Tuesday, March 24th, 2020 AT 2:55 PM (Merged)
Tiny
CAPTANRON
  • MEMBER
  • 16 POSTS
Hey guys! I got my Carb rebuild kit today and will be installing it sometime this week hopefully. I've been pretty busy lately. Holley Carb Renew kit 3-1346 for a 4180C carb.
As usual the instructions suck. The print is so small, I cant read the instructions with my tripple bifocal glasses. Holley could improve on this. More later
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Tuesday, March 24th, 2020 AT 2:55 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
You have the cleaning tools? Shop air?
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Tuesday, March 24th, 2020 AT 2:55 PM (Merged)
Tiny
ZIMMYJO
  • MEMBER
  • 1 POST
  • 1989 FORD F-250
  • 130,000 MILES
I drove it the other day about 10 miles, it wouldn't go over 55. Then drove about 2 miles, wouldn't go over 30. Then another mile or so and it wouldn't go over 15. Now it won't move at all. It's a stick. What could it be?
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Tuesday, March 24th, 2020 AT 2:56 PM (Merged)
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Is it a lack of power or a lack of motive force? If you put it in reverse, does it go anywhere?

Jack up and support the rear end. See if the driveshaft moves when it's in gear(forward or reverse). If not, we have a few possibilities.
First, the pressure plate could be bad.
Second, bad clutch disc.
Third, broken input shaft.
Fourth, broken output shaft.
Fifth, other internal transmission problems requiring overhaul or replacement.
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Tuesday, March 24th, 2020 AT 2:56 PM (Merged)
Tiny
HUNTSFORHORNS
  • MEMBER
  • 3 POSTS
  • FORD F-250
The timing on my 86 f-250 4x4 with 5.8 litre engine is not kosher something is wrong with it when #1 is at top dead center on intake stroke the timing mark is 180 degrees out I have pulled the distributor out and reset but truck would not run also have moved wires 180 deg but still wont work could it have wrong harmonic balancer installed truck runs very sluggish and very slow revving up it also has automatic tranny and holley 4 barrel
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Tuesday, March 24th, 2020 AT 2:56 PM (Merged)
Tiny
JEFTFIELDS
  • MEMBER
  • 74 POSTS
Check real close and make for positive you have the timing mark if I remember right some of those have 2-3 marks on it and it will throw you off.
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Tuesday, March 24th, 2020 AT 2:56 PM (Merged)
Tiny
HUNTSFORHORNS
  • MEMBER
  • 3 POSTS
You are correct it has 3 marks on it but none are anywhere close at TDC or 180 out I have timed a lot of vehicles but this one threw me off and I was wondering if there was a way to fix it without teardown
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Tuesday, March 24th, 2020 AT 2:56 PM (Merged)
Tiny
JEFTFIELDS
  • MEMBER
  • 74 POSTS
I think the only thing you could do at this point is to remove the #1 spark plug whitch is the first one on the pasenger side, have someone turn the motor over little bumps at a time, with your finger over the hole in#1 cyl, as you feal comp, stop then recheck for timing mark, and readjust dist, to #1, with this done you should get something out of the truck.
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Tuesday, March 24th, 2020 AT 2:56 PM (Merged)

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