My carb need replaced?
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Freshman User
Joined: Oct 2009
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From: Hartsville, TN
My carb need replaced?
I had to take my truck to a local mechanic because I couldnt figue out what was going on with it. He called me today and told me I was gona need a new Carb. He said that he had to tie the choke back to get the truck to run rite and I could drive it but it would drank to much gas. My question is should I replace it or is there something he may be missing? The carb has been tore down and cleaned and the power vavle replaced. Thanks for any help!
Senior User
Joined: Mar 2009
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By drinking to much to you mean flooding or just running way rich? Also I can't really even come up with an idea on why he tied the choke back. I'd check the floats first. I'm not fimiliar with the motorcraft 2bbl at all, hopefully someone else can help. I personally would get a edelbrock.
New User
Joined: Nov 2007
Posts: 22
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From: On the border
Sounds like he doesn't want to work on it.
The M/C 2v is a dead simple carb. If it's flooding there are only a couple of things it could be.
1. The float is compromised and sinking because it's taking on fuel
2. The needle/seat is leaking flooding it.
3. Power valve is bad/stuck.
4. Idle circuit is clogged with trash and cruise circuit is tipping in too soon as a result
5 Out of adjustment and the throttle blades are open too far at idle causing the cruise circuit to tip in at idle
etc.
If the engine was warm then the choke should be off anyway.
Something is fishy here.
My absolute wild guess is that you've been buying cheap fuel that has a percentage of ethanol in it and that your accelerator pump and maybe your power valve have holes in them as a result. If the carb wasn't rebuilt with the proper parts to withstand ethanol it will develop leaks, fuel lines will erode and trash up the carb, and other bad stuff.
Need more info.
The M/C 2v is a dead simple carb. If it's flooding there are only a couple of things it could be.
1. The float is compromised and sinking because it's taking on fuel
2. The needle/seat is leaking flooding it.
3. Power valve is bad/stuck.
4. Idle circuit is clogged with trash and cruise circuit is tipping in too soon as a result
5 Out of adjustment and the throttle blades are open too far at idle causing the cruise circuit to tip in at idle
etc.
If the engine was warm then the choke should be off anyway.
Something is fishy here.
My absolute wild guess is that you've been buying cheap fuel that has a percentage of ethanol in it and that your accelerator pump and maybe your power valve have holes in them as a result. If the carb wasn't rebuilt with the proper parts to withstand ethanol it will develop leaks, fuel lines will erode and trash up the carb, and other bad stuff.
Need more info.
MSEE
Joined: Apr 2004
Posts: 10,386
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From: Austin, TX
Any mechanic that tells you you need a new carburetor should no longer be your mechanic, because he should know that remanufactured carburetors are a wild goose chase, and in the case of a Motorcraft 2-barrel, the only thing that really can't be solved with a rebuild is a worn throttle shaft which isn't the question here.
What is the problem with the choke specifically? Is it not opening? Is it stuck shut? Give this a read:
https://www.ford-trucks.com/forums/8...ml#post6939116
What is the problem with the choke specifically? Is it not opening? Is it stuck shut? Give this a read:
https://www.ford-trucks.com/forums/8...ml#post6939116
Thread Starter
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Freshman User
Joined: Oct 2009
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From: Hartsville, TN
Well I was told it would cost around 75 bucks to fix and I got a 249 dollar bill so that sucked really bad when my truck still ran like crap. I just thought about buying a new one and be done with it....... The power valve has been replaced and a new fuel pump put on it. Im not very good with carbs but if I buy a rebuild kit do you think it will fix the problem? I may have to try to rebuild it or buy a Demon carb because I have heard alot of good things about them. Just want my truck running rite lol
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Junior User
Joined: Sep 2009
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I had a problem with my choke not pulling off. The engine would sputter when revving up to shift and wouldn't climb hills. Tied it back with a twist tie at first but then adjusted it so its always open. Need to convert it to a manual choke yet.
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Thread Starter
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Freshman User
Joined: Oct 2009
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From: Hartsville, TN
The truck starts and idles fine and the throttle response is good but when I take off to drive it it runs like crap and cuts out really bad like its flooding because it backfires through the carb. after the $249 I paid him I took it back and wanted it fixed rite but he called me today and said that he tied the choke back and test drove it and it ran great. He then went on to tell me I need to buy a new carb. I could have bought a new carb for the money I paid him for nothing......
Freshman User
Joined: Oct 2009
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Box of cigars and beer for the "mechanic"
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Freshman User
Joined: Oct 2009
Posts: 47
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From: Hartsville, TN
Fuel pump, Pulling the carb like 3 times trying to figure it out and replaced the power valve is all I know he done. I asked him about the timing and he said that he checked it and it was good? Thanks I will check the timing.
Senior User
Joined: Mar 2008
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I want my...I want my MTV
Money for nothing, chicks for free. I'll bet that so called mechanic has a carb to sell ya too. Anyway, a rebuild kit is not that bad. you basically replace all the gaskets, and check the calibrations as you rebuild it. Simply take your time when tearing down to investigate how the parts function and think about how it gets reassembled as you take it apart. Another helper that I've read on here is to take pictures of stuff for reference. Your particular problem screams carb rebuild to me and a double check on the calibrations and timing. For 249 bucks I would have replaced and bled your brakes, rotated your tires, changed plugs wires button and cap, and threw a timing light on it, examined your transmission fluid, let you give it a test drive, and literally give you a handful of zip-ties to throw in your glove box, before I expected any payment.
New User
Joined: Nov 2007
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From: On the border
There's also another variable.
You need to ensure that the new fuel pump isn't malfunctioning and providing too much fuel pressure. If it is, it only needs to be up around 8psi to flood the Motorcraft 2v.
So, check the carb for flooding, just to be sure.
Since you have a new power valve, it seems to point to something else. Bad pumps are known to happen out of the box.
You need to ensure that the new fuel pump isn't malfunctioning and providing too much fuel pressure. If it is, it only needs to be up around 8psi to flood the Motorcraft 2v.
So, check the carb for flooding, just to be sure.
Since you have a new power valve, it seems to point to something else. Bad pumps are known to happen out of the box.