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79 ford f150 idles fine dies when step on gas
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redneck100247
New User
Nov 5, 2009, 1:00 PM
Post #1 of 5
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79 ford f150 idles fine dies when step on gas
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I have a 1979 ford f150 with a 351m I have replaced the fuel pump, the filter, the accelerator pump on carb, and i have blown out the fuel line with air. the truck will idle fine, when I go to press gas pedal the truck will die.
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Loren Champlain Sr
Veteran
/ Moderator
Nov 5, 2009, 6:47 PM
Post #2 of 5
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Re: 79 ford f150 idles fine dies when step on gas
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redneck; My first instinct would be the accelerator pump diaghragm. But, if you've already replaced it,.... With the engine off, work the throttle while looking down the barrel of the carb to make sure the accel. pump is working. These did have somewhat of an adjustment where the linkage attaches to the throttle lever. If everything is good, then, let's look at the distributor. Try disconnecting the vacuum hose to the vacuum advance. Plug off the hose and try it. It is uncommon, but when the distributor advances, it can lose ground (internally) and cause the hesitation.
Loren
SW Washington
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greg69jones
Novice
Nov 6, 2009, 7:01 AM
Post #3 of 5
(6713 views)
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Re: 79 ford f150 idles fine dies when step on gas
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I dont know much about cars, but I had this EXACT same problem, it ended up being my distributor cap and rotor arm inside needing to be replaced, I swapped my Fuel pump, filter and all relays and way to much other crap, just to find out later its a $13 friggin part.
May not be same issue for you, but hope it is so its a cheap easy fix!
Good luck!
Greg
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 6, 2009, 8:13 AM
Post #4 of 5
(6712 views)
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Re: 79 ford f150 idles fine dies when step on gas
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Yes, it is possible for that to be a bad coil, coil wire or distributor cap. They will fail under load if they have high resistance.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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chickenhouse
Enthusiast
Nov 7, 2009, 4:54 PM
Post #5 of 5
(6692 views)
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Re: 79 ford f150 idles fine dies when step on gas
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My experience with this prob- same engine, turned out to be the EGR stuck open just a little. Fixed that for my future father-in-law (RIP) years ago. They then promptly stole the truck. Detroit Must've known it was fixed!
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