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Ford 3000 - bang-sputter-putt - possible diagnosis

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Bob Jarvis

11-02-2007 14:18:11




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My Ford 3000 has been progressively acting worse over the past couple months, to the point where it's an embarrassment to me and an aggravation to the neighbors whenever I start it up. Misses, backfires, and sputters when it's cold, then after it warms up it runs reasonably well - but this can take up to half an hour. After convincing myself that it's not electical and not fuel, I started looking at the air side of things, guessing that maybe I've got an air leak somewhere. So I decided to check intake manifold torque. Found that a few were loose (15 ft/lbs or so - should be 23-28 according to the manual) so I tightened 'em down. While I was doing so, though, I happened to bump the small metal tube that runs from just above the carb (between carb and intake valves) and the little gizmo just under the distributor, and the dang thing came loose at the carb end. I believe this is a vacuum line, controlling vacuum advance of the distributor - am I right? And given that this thing is loose it's probably leaking air and causing my mixture to go extra-annoyingly lean. How'm I doing so far?

So here's my questions: 1. Does this at least sound reasonable? 2. How do I repair the line? I'm assuming it's a "flare" fitting, but I don't know what kind of tool I need to "flare" the tube. I'm thinking that for now I'll put some gasket-in-a-tube stuff around it, but I know that's not the right thing.

All help/advice/admonishments greatly appreciated.

Thanks,
Bob

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JR in nwmo

11-11-2007 20:54:27




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 Re: Ford 3000 - bang-sputter-putt - possible diagnosis in reply to Bob Jarvis, 11-02-2007 14:18:11  
Your engine is in labor when gov is open,check fire order it fires 1-2-3 points .025 also run compression check. Could have bad valve. On my 3000 I had a rocker arm adj nut come loose and the pushrod came off.Also check cap and rotor for carbon tracking.Im not sure which way the dist rotates.The backfire tells me one of the plug wires is wrong. Good luck



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mowr

11-04-2007 18:52:48




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 Re: Ford 3000 - bang-sputter-putt - possible diagnosis in reply to Bob Jarvis, 11-02-2007 14:18:11  
We had a Ford car that was doing the same thing you describe. It turned out that a wire in the distributor had the insulation worn off in one spot and when the advance mechanism moved, the bare spot touched metal and grounded out the ignition momentarily. When I stepped on the gas, it would jerk and backfire and when I let up, it would smooth out. So you may be losing spark somewhere; could even be bad plug wires, cap or rotor.

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Bob Jarvis

11-05-2007 17:58:28




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 Re: Ford 3000 - bang-sputter-putt - possible diagnosis in reply to mowr, 11-04-2007 18:52:48  
Talked to my brother-in-law who has worked on tractors since he was a kid, and he recommended I look into sparkies as well. Read the fine manual and it suggested that it was perhaps condenser, bad secondary wire, or a bad coil. Ran a continuity check on the coil and it had zero resistance, so I'll assume it's OK for now. Checked the secondary wire between the coil and the distributor yesterday and found it showed 6000 ohms resistance. Hmmm... That doesn't sound right to me. Stopped at the New Holland dealer today and picked up a tune-up kit, new wires, and a new distro cap. I'll start putting it in one thing at a time (well, perhaps condenser first, then wires, then to heck with it and put everything else in) and see what fixes it. We'll see...

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Bob Jarvis

11-03-2007 12:50:27




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 Re: Ford 3000 - bang-sputter-putt - still a problem in reply to Bob Jarvis, 11-02-2007 14:18:11  

Once I got it apart I found that the nut appears to compress slightly on the line. Put it back together and found I could no longer pull the vacuum line out of the nut. Put a little silicone seal on where the line goes into the nut. Fired the tractor up.

No improvement.

Drat.

Watched it for a while (as it tried to deafen me with backfires) and noticed that the governor arm seems to stick all the way back (which I think is the 'open throttle' position) and then suddenly jumps all the way to the front, at which point the engine smooths out for a second or two. Then it's back to sputter-cough-choke-bang again.

I'm open to ideas.

Thanks,
Bob

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Dave in Ms

11-03-2007 11:43:24




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 Re: Ford 3000 - bang-sputter-putt - possible diagnosis in reply to Bob Jarvis, 11-02-2007 14:18:11  
I know nothing about a 3000. That said, if the line you're talking about is a vacuum advance line, and it was leaking, it's a good chance you have found your problem. Seems to me that the simple fix would be to just tighten the connection. Was that not possible for some reason?



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