More idle problems
I thought the issue had resolved itself somehow, but the car will not idle again. The car was running fine, then the next day would not idle. Couple days later, without doing anything to the car, it idled fine again. I took the carb off disassembled it and cleaned it out. Replaced the low speed jet, and everything from a Carter rebuild kit. It made no difference. I am totally out of ideas. Checked the pressure from the fuel tank and it was 3psi, (electric fuel pump with regulator set at 3).
What could it possibly be? I feel its carb related, but after the rebuild I don't know where to look.
Here is the original post for reference.
http://www.classiccar.com/forums/showthread.php?t=9863
What could it possibly be? I feel its carb related, but after the rebuild I don't know where to look.
Here is the original post for reference.
http://www.classiccar.com/forums/showthread.php?t=9863
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Comments
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This is a long shot...Years ago, I bought a 1955 Ford quite cheaply because it would sputter and stall when going over about 35 MPH. They had done everything...rebuilt the carb, fuel pump, etc.
Turned out that the wire at the distributor (not the high-tension wire, but the one about 14 guage) had a small area of insulation missing, and at speed, the wind in the engine compartment would push it to a ground and short it out.
I was 17 years old, didn't know much about cars, and found that by accident because I didn't know any better that it could be the problem. I just spotted the bare spot on the wire and taped it up and the car ran fine.0 -
Next time it's not wanting to idle, take the vacuum line loose from the intake manifold and plug the manifold fitting with your finger, or with something else if it's hot. If that fixes it, you've likely got an intermittent vacuum leak ... maybe a cracked hose to the wiper motor, etc.0
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A vacuum leak will normally cause the idling to speed up slightly. Next time time it happens, also go round the back and check to see if there is any black smoke coming out the tail pipe. if so you have an over-rich situation which could indicte a float level problem. I'm not sure what the gas situation is over there, but the stuff we have here is a lot lighter than the original they used back in the thirties, and you have to lower the float level quite a bit for optimum results.
Geoff.0 -
The vacuum lines are fine, they were checked and removed and the vacuum port was plugged. It didn't help.
I can't get it to idle without pumping the gas pedal. But I did reset the float to the 3/8 spec when I had the carb apart.0 -
Okay, check for smoke when idling - this would indicate that the carby is flooding, and you may have to lower the float level, or reduce the pump pressure. If no smoke, then it still gets back to a blockage in the idle jet.
Geoff.0 -
Not only did I clean out the idle jet, but I replaced it with a new one from the rebuild kit.0
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Here's a couple of things I have run into. With these older carbs they develop problems that can't be fixed with just a rebuild kit. They can develop warps between the surfaces that the gaskets can't seal and they get loose at the throttle shafts where they will start to pull air. I have had this happen on a couple of carbs over the years and had to break down and take them to a good carb shop that can find and make these repairs. I just recently went through this on a Holley 4bbl I rebuilt and couldn't get to idle. I finally took it to a carb shop I know and they found that the mixture screws were wrong though it was the ones I got it with and it idled before. They found some corrosion in a couple of idle passages that can only be accessed by knocking out some plugs I didn't know about. Lastly,the gasket that goes between the throttle plate and the main body was wrong and was blocking a couple of small passages. This was a factory Holley rebuild kit so that tells you that rebuild kits can be wrong and you won't necessarily know the differances. Just some ideas that may help. Good Luck!0
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Ok, following that thought, who would be able to do a serious rebuilt on a W-1 like that? More than just throwing in a rebuild kit.0
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The place I took my Holley to I found out about here as he was doing some WA-1's for him. He is currently doing one for a gentlemen out of AZ. He also has a couple of my old Ford /Holley 2 bbls off my Ford flatheads he is working on. The company is called Culver Carburator. # is 310-837-2202. Ask for Dave and tell him Rob MacKey referred you.0
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Sometimes quite coincidently, a new problem comes from out of left field at the same time that you are attending to current problem. You naturally suspect it is linked to what you are already dealing with. Maybe check your distributor for fluctuating timing, leaking vacuum advance/retard diaphram, loose breaker plate? Paul.0
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Well, once again I thought the problem was solved. I removed the distributor and cleaned it up and checked to see if there was any wear. There was no slop in the shaft so I put it back together and lubed up the weights. Put new points and rotor on. Retimed it. The car idled great and drove great. Over the course of the next 5 days, made sure to start the car every day. Didnt take it out of the garage, just started it, let it warm up and saw if it would idle. For 4 straight days it idled perfectly. Then on Friday I started the car and all of a sudden the car was running rough, and would not idle. Why on earth would things have changed from Thursday to Friday when the car hadnt even left the garage. This problem is really starting to drive me crazy.0
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Have you tried running the car from a gas can so you can eliminate the fuel lines and gas tank? almost sounds like something in the gas.0
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I had an intermittent problem with my '29 Hudson some years ago, it would intermittently run lean, and spit back through the carby. I would stop, have alook, and it would go fine again. This went on for some months, until one day i couldn't get over 40 m.p.h., and I stopped and took the carby off. Inspectionof the main jet revealed a small sliver of wood stuck therein. Removed that, an never had any more tourble afte rthat. it was obviously floating round int he jet well, and would occasionally block the jet. When I stopped, it would fall back down again, and everything would be fine until next time. Perhaps removal of the jets, and a good blow out with compressed air may help. Just a thought.
Geoff.0 -
Well I had the carb apart and flushed it with carb cleaner. But I guess it could have missed something internally. I will also try to run the car out of a small can of gas to see if its a problem rear of the carb.0
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