Carb 2100...HELP!
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Junior User
Joined: Sep 2007
Posts: 50
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From: Victoria West
Carb 2100...HELP!
The engine in my '74 F-100 Custom runs just fine, idles beautifully, ignition timing advanced to specs, but...when runs cold she accellarates like a charm. As soon as the motor reaches warmer temp. she runs rough at low speeds, as soon as I accelarate she's fine. When I come to a stop she idles high and I have to press the accelarator once to get her down to normal idle.
The ignition timing seems fine and I can't detect airleaks at the intake manifold or carb spacer. All ignition components are brand new (points). The choke has long since been disabled...no need for it, as she starts first time, every time. Could it be:
1- The Mechanical fuelpump is playing up.
2- The carb needs a rebuild or adjustment.
3- The old choke bits are an interference.
If you think I have overlooked something let me know.
The ignition timing seems fine and I can't detect airleaks at the intake manifold or carb spacer. All ignition components are brand new (points). The choke has long since been disabled...no need for it, as she starts first time, every time. Could it be:
1- The Mechanical fuelpump is playing up.
2- The carb needs a rebuild or adjustment.
3- The old choke bits are an interference.
If you think I have overlooked something let me know.
Postmaster
Joined: Aug 2000
Posts: 3,312
Likes: 1
From: Eldorado Ca. USA
I'd make sure the choke parts are disabled, wire it open. Check your linkages to your acceleator cable, you could be hanging up just a touch on something? Rebuild kits are cheap, if you know how to do it, do-it. Things contract when they get hot, you could be developing a vacuum leak someplace. Check along all vacuum lines, and the brake booster(assuming you have one) Carb cleaner or an unlit propane torch work good. What are your vacuum readings? When the truck is running fast, shut it off, pop the hood, and try to pull the throttle closed (or use the gas pedal if you still have mechanical linkage) Have you tried adjusting your carb, and I assume you still have the same problem?
I am not a carb expert, but fiddling around a bit more might find your problem.
I am not a carb expert, but fiddling around a bit more might find your problem.
Last edited by masterbeavis; Sep 14, 2007 at 11:13 PM.
Cargo Master
Joined: Dec 2004
Posts: 2,232
Likes: 3
From: NE Texas
I fully expect that the problem is in the carburetor. If you understand carburetion, you can go through and figure it out. If not, it's either time for a carburetor or time to rebuild it whichever you feel more comfortable with.
If you choose to rebuild it, check the throttle shaft first to make sure it is not loose. If it is, the rebuild could be a waste of time.
If you choose to rebuild it, check the throttle shaft first to make sure it is not loose. If it is, the rebuild could be a waste of time.
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Junior User
Joined: Sep 2007
Posts: 50
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From: Victoria West
Right, now I feel like a right pillock! After contemplating and stripping the carb, rebuilding, resetting the timing, the problem persisted...and got worse. The bloomin' culprit was the clutch!
Some dirt got in through the cavity behind the sump, to protect the flexplate, and caused the clutch the slip. As I was still hunting for one, it didn't occur to me that this could happen...so, off with the drive-shaft, off with the transmission, off with the bellhousing and there they were bits off oil caked muck on the pressure plate and all over the clutch plate.
With new clutch plate, resurfaced flexplate, pressure plate, release bearing, pilot bearing AND back-cover, the old truck is ploughing along like she's forever in a hurry.
Thanks for all the advice, nonetheless!!!
Some dirt got in through the cavity behind the sump, to protect the flexplate, and caused the clutch the slip. As I was still hunting for one, it didn't occur to me that this could happen...so, off with the drive-shaft, off with the transmission, off with the bellhousing and there they were bits off oil caked muck on the pressure plate and all over the clutch plate.
With new clutch plate, resurfaced flexplate, pressure plate, release bearing, pilot bearing AND back-cover, the old truck is ploughing along like she's forever in a hurry.
Thanks for all the advice, nonetheless!!!
Thread Starter
|
Junior User
Joined: Sep 2007
Posts: 50
Likes: 0
From: Victoria West
Right, now I feel like a right pillock! After contemplating and stripping the carb, rebuilding, resetting the timing, the problem persisted...and got worse. The bloomin' culprit was the clutch!
Some dirt got in through the cavity behind the sump, to protect the flexplate, and caused the clutch to slip and rattle. As I was still hunting for a back cover-plate, it didn't occur to me that this could be a serious problem...so, off with the drive-shaft, off with the transmission, off with the bellhousing and there they were, bits off oil caked muck on the pressure plate and all over the clutch plate.
With new clutch plate, resurfaced flexplate, pressure plate, release bearing, pilot bearing AND back-cover, the old truck is ploughing along like she's forever in a hurry.
Thanks for all the advice, nonetheless!!!
Some dirt got in through the cavity behind the sump, to protect the flexplate, and caused the clutch to slip and rattle. As I was still hunting for a back cover-plate, it didn't occur to me that this could be a serious problem...so, off with the drive-shaft, off with the transmission, off with the bellhousing and there they were, bits off oil caked muck on the pressure plate and all over the clutch plate.
With new clutch plate, resurfaced flexplate, pressure plate, release bearing, pilot bearing AND back-cover, the old truck is ploughing along like she's forever in a hurry.
Thanks for all the advice, nonetheless!!!
