Carb acting strange
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Carb acting strange
Hello everyone.
Im currently working on a 1965 F-250. It has a 390 from a 70's year truck in it. This car had more splices in the electrical than anything I have ever seen. 2 batteries, 2 alternators, and birds nest on both sides of the engines.
I have all that cleaned up now, but the truck is doing something very odd ive never experienced before.
After the engine has warmed up, the car just wont go faster than 20 mph without the choke pulled to full. As soon as you engage the choke all the way, it runs fine (all those burns gas like mad). Push the choke back in, and the car wont go past 20. It just revs up and then no matter of gas pedal action will get it to rev higher, and it feels like the engine is bogging down. However put the car in park, and you can rev as high as you please.
Im assuming this going to have to do with butterfly getting stuck and the choke not really engaging right? Ive never had to work on a carb before, got lucky on my 70 Mach 1 that the engine was good shape.
Any suggestions would be greatly appreciated.
Dave.
Im currently working on a 1965 F-250. It has a 390 from a 70's year truck in it. This car had more splices in the electrical than anything I have ever seen. 2 batteries, 2 alternators, and birds nest on both sides of the engines.
I have all that cleaned up now, but the truck is doing something very odd ive never experienced before.
After the engine has warmed up, the car just wont go faster than 20 mph without the choke pulled to full. As soon as you engage the choke all the way, it runs fine (all those burns gas like mad). Push the choke back in, and the car wont go past 20. It just revs up and then no matter of gas pedal action will get it to rev higher, and it feels like the engine is bogging down. However put the car in park, and you can rev as high as you please.
Im assuming this going to have to do with butterfly getting stuck and the choke not really engaging right? Ive never had to work on a carb before, got lucky on my 70 Mach 1 that the engine was good shape.
Any suggestions would be greatly appreciated.
Dave.
Elder User
Joined: May 2009
Posts: 554
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Well you could try rebuilding the carb. Its pretty cheap and easy to do. My problem is the fact that you can rev it as high as you want with it in park. I an in no way an expert on any of this, but it may be a tranny issue too.
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Only thing making me think its Not the transmission, is the fact the engine wont rev.
Usually the engine should still get high revs, but the car just wont go if the tranny is slipping. Thats what happened to me before on a different car.
But im no expert either.
Usually the engine should still get high revs, but the car just wont go if the tranny is slipping. Thats what happened to me before on a different car.
But im no expert either.
Senior User
Joined: Dec 2009
Posts: 230
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From: Centralia, WA
It may be that the choke has been installed to be closed when in and open when out (the opposite of my F100). 
When you operate the F250 as if the choke has been installed to be closed when in and open when out what problems do you experience?
When you operate the F250 as if the choke has been installed to be closed when in and open when out what problems do you experience?
Freshman User
Joined: Mar 2011
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From: Portland, Oregon
it could be the accelerator pump valve is bad. on my 65 f1 (360 2bbl) the accelerator pump valve acts up so when i start the truck, it runs fine and idles down, but when i go to drive i hit the accelerator and it cuts out sometimes. still waiting on that part to come via snail mail. all i know is everytime i start my truck i pull the choke out all the way, tap the gas to set the fast idle cam, and then i push the choke in about halfway, sometimes more depending on the temperature, and turn the key. it starts everytime (usually)
Senior User
Joined: Dec 2010
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Just a thought? check the ''Timing'' sounds like it could be retarted, also could be a plugged fuel filter, not letting enough fuel to the floatbowl under load, so when you put it in drive it's starving for fuel, so you pull the choke and brings the fuel level up then runs..remove filter and replace.
Posting Guru
Joined: Jun 2011
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From: Tempe
yea thats the best ur gonna be able to do. just check your carb and lines running into it. see if its getting enough fuel
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agree on the vacuum leak.
a '65 can't have too many vacuum lines, right? brake booster, PCV system, vacuum modulator on the tranny...maybe a leak under the carb base?
or did the PO bring over a bunch of smog stuff from a later 70's engine?
a '65 can't have too many vacuum lines, right? brake booster, PCV system, vacuum modulator on the tranny...maybe a leak under the carb base?
or did the PO bring over a bunch of smog stuff from a later 70's engine?
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