Ned Buckshot, SASS #2901 Posted August 3, 2011 Share Posted August 3, 2011 I've got a 1984 F 150 in perfect condition with 34,000 original on it. It started stumbling pulling away from stop signs and now it kills at every one. I replaced the fuel and air filter with no positive results. Anybody have any idesa? Thanks Ned Link to comment Share on other sites More sharing options...
Gunner Gatlin, SASS 10274L Posted August 3, 2011 Share Posted August 3, 2011 Clean the carburater GG Link to comment Share on other sites More sharing options...
Boss Hoss Fly #63711 Posted August 3, 2011 Share Posted August 3, 2011 Sounds like it just sits alot- Most likely dryed gaskets in carb- A carb kit mite do it if you've dun made sure the gas path to it is clear. Link to comment Share on other sites More sharing options...
Charles B. Gatewood SASS #48517 Posted August 3, 2011 Share Posted August 3, 2011 Howdy Ned, As stated you might clean the carb and run some BG through it. Has the fuel filter been changed? You might have someone check the choke. Some of those trucks ( I had 2) had problems with the electric choke acting up. It's probably something simple. Those were good trucks overall and there are times I wish I still had one. Especially when spark plugs on the late models can cost over $1000 to have changed. Regards, CBG Link to comment Share on other sites More sharing options...
Blackwater 53393 Posted August 3, 2011 Share Posted August 3, 2011 Ned, The choke would only be an issue if it were remaining closed, in which case the truck would run rich, (lots of black smoke, poor performance, smell like gasoline, heavier fuel consumption). This sounds more like the accelerator pump has dried out and shrunk or split and torn thus not giving the system that little extra shot of fuel when you step on the gas. Remove the air filter and with the engine shut off, look down the carb bores and operate the throttle linkage. There should be a steady small stream of gas squirting down the bores of the carb through most of the throttle stroke, starting when the throttle blades, (butter flies) first move. There is also a power valve in most Ford carbs that adds some fuel as the vaccuum drops on acceleration. If this has failed it will usually leak excess gas into the system, but in some cases it gets hard and stops working which stops the extra fuel from getting into the system. Also check to see if the distributor has a vaccuum advance. If it does and that is not working you can have some of the same symptoms. Finally you should have the plugs and plug wires checked. I've had several cases where they were breaking down electronicaly and causing hesitation and stalling. It's not rocket science, but a fair knowledge of ignition and fuel systems is a good thing. Link to comment Share on other sites More sharing options...
Charles B. Gatewood SASS #48517 Posted August 3, 2011 Share Posted August 3, 2011 What BD said is good advice. Probably just a process of elimination. Regards, CBG Link to comment Share on other sites More sharing options...
Ned Buckshot, SASS #2901 Posted August 3, 2011 Author Share Posted August 3, 2011 Thanks Everybody Looks like I need to put my mechanic hat on! Link to comment Share on other sites More sharing options...
Jack Houston # 35508 Posted August 3, 2011 Share Posted August 3, 2011 I had a 72 F-150 with a 460 in it. When it ran for awhile, like going somewhere on the freeway it would DIE. A real pain on Houston Freeways!! After sitting on the side of the Freeway, maybe 15 min. it would start-up and go for sometimes days before doing it again. I worked at a Goodyear store and the mechanics there tried everything nothing worked! Finally a District Rep from Akron Ohio was visiting the shop doing a check-up on our store my truck was in a bay with me and a mechanic trying to figure out what to do next. He asked what were doing, I told him the trouble, he went to the parts dept, got a new coil, told us to put it on...fixed it! It had an intermittent short, when it got hot enough it would quit putting out! Link to comment Share on other sites More sharing options...
Mustang Gregg Posted August 3, 2011 Share Posted August 3, 2011 How's the accelerator pump? It is carbureated, right? Mustang Gregg [da old Ford guy] Link to comment Share on other sites More sharing options...
J. Mark Flint #31954 LIFE Posted August 3, 2011 Share Posted August 3, 2011 Blackwater gave you good advice, I'll add that a coil that is failing will give intermittent faults for a while, but that as it heats up it will fail. Check for moisture under the distributor cap, a weak spring on the rotor button and a cracked distributor cap. Another thing to check is an exhaust restriction-I did once see a mud daubber's nest in the exhaust pipe of a car that had been sitting Nothing about those trucks that is too terribly hard to fix or replace. Good luck Link to comment Share on other sites More sharing options...
The Original Lumpy Gritz Posted August 3, 2011 Share Posted August 3, 2011 With it running bad at stopped/idle, I would be first looking for a vacuum leak And check the acelerator pump in the carb. When was the carb. last rebuilt? IF, it's been more than a couple of years, then rebuild it. Also, make sure the nuts are TIGHT on the carbs base. Respectfully, LG Link to comment Share on other sites More sharing options...
Jack Houston # 35508 Posted August 3, 2011 Share Posted August 3, 2011 With it running bad at stopped/idle, I would be first looking for a vacuum leak And check the acelerator pump in the carb. When was the carb. last rebuilt? IF, it's been more than a couple of years, then rebuild it. Also, make sure the nuts are TIGHT on the carbs base. Respectfully, LG Yea, it could be sucking air! Link to comment Share on other sites More sharing options...
Blue Wolf , SASS# 29424L Posted August 3, 2011 Share Posted August 3, 2011 An easy way to check for a vacuum leak is to spray starting fluid around the vacuum hoses when the engine revs you found your leak. Blue Wolf Link to comment Share on other sites More sharing options...
Sergeant Smokepole #29248L Posted August 3, 2011 Share Posted August 3, 2011 You could also look at the magnetic pick up coil within the distributor and Ford did have an issue with their ECU's a number of years ago on Pick 'em up trucks.... Link to comment Share on other sites More sharing options...
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