Throttle issues
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Cross-Country
Joined: May 2019
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From: SE Oklahoma
Throttle issues
351w with old motor craft 2100 in 82 f150 4x4 has been running fine. But today went to take off and truck jerked like starving for fuel. Only happens with the first 1/2 inch to inch of pedal any more it runs fine. Idles fine new electric fuel pump fuel filter plugs wires distributer. Carb has been rebuilt all emissions removed the carb could be could be a 2150. A family member had it and the intake and let me have them both said it was a 2100
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From: Virginia
Even though the carb is "rebuilt" check to make sure the accelerator pump is working correctly. With the engine off, take the aircleaner off and crawl up in the engine compartment and look down the carb throat with a flashlight. If you have to hold the choke door open with your finger, do so. Then take the throttle and move it to open. As soon as you move it, you should see two strong streams of gas pour into the engine. If there is a delay or the streams are not very much, then that is your stumbling problem.
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Joined: Jan 2001
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From: Virginia
Does it do it cold or only hot or at any time? And it's repeatable? If it's doing it, or you can predict it's going to do it, pull the aircleaner off again and see if the choke door is wide open straight up and down, or is it partially shut?
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Cross-Country
Joined: May 2019
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From: SE Oklahoma
It does it when it’s hot or cold in all gears but only during the first inch or so of peddle. When It does it if I push farther on gas peddle it’s fine. It will do
it every time during the first part of throttle range. I even went as far as wiring choke wide open the see if that was it still does it.
it every time during the first part of throttle range. I even went as far as wiring choke wide open the see if that was it still does it.
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Joined: Jan 2001
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From: Virginia
Look way under the front of the carb, there should be two idle mixture screws. With it fully warmed up, I would adjust these to see if it improves. With it idling turn one of them in till the idle is noticeable worse, and then turn it out till it runs it's best. Then go to the other screw and do this again. Then go to the first screw and turn it in and out again till it runs it's best/fastest and then do the second screw again. If they end up in a very different place, take it out on the road and try it. If it is idling way faster than it did before the adjustments, you can turn the idle speed back down with the idle stop screw on the throttle arm.
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Cross-Country
Joined: May 2019
Posts: 57
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From: SE Oklahoma
Will try adjusting carb Sunday thanks for the help. Went to move truck so I could mess with it now backfiring through carb on acceleration. So figure more to it will have more time to mess with it sunday
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Cross-Country
Joined: May 2019
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From: SE Oklahoma
Timing chain is Prolly the original block is out of a 1990 f150. Played with carb today adj as best as I can. Hooked a vacuum gauge to carb to check it gauge read late ign timing. But that is we’re it has been the whole time so gauge maybe bad. Plus side exhaust does not stink like it did. Timing is set at 10 Btdc
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Cross-Country
Joined: May 2019
Posts: 57
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From: SE Oklahoma
Sorry not replied been sick, drove today after adjusting carb and it died then started back firing again. Changed plugs and wires then would not start do to no power to ignition. Wiggled the fusible link from battery to main wire for ignition everything started working. Replaced with a new fusible link now everything works. Only thing i can think of is while driving maybe vibration was causing bad link to have intermittent issues causing ignition to cut out at certain times. Drove 40 miles home no throttle issues no back fires nothing.
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