76 F100 Stalling Issue
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Joined: Apr 2017
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76 F100 Stalling Issue
I have a 1976 F-100 with the 300ci i6 motor. It start right up every time and idles fine, I can give it gas and rev it up all I want and it seems "fine" (motor has some blow-by). When i put it in gear it drives fine then out of no where it will either stall without warning, or bucks pretty aggressively then dies. I know I have blow-by but could the stalling issue be caused by the same issue causing the blow-by? The truck would be drivable with just the blow-by until i could source another motor.
Thanks for any help!
Thanks for any help!
Fleet Mechanic
Joined: Aug 2004
Posts: 1,311
Likes: 31
From: Nevada
Wouldnt panic yet
I'm with HIO, wouldn't panic yet, if its fuel it wouldn't be too painful to pin down.... If you wanted to rule that out, take the carb off, stock filter (not sure if you have a can on top or the can below the pump arm) Clean carb, replace filters and if you have the lines off, a few new feet of fuel hose would only make sense (unless your running some of the stock metal fuel tube)........ Do you know when the Carb has been rebuilt or cleaned last ? Remember it always boils down to fuel/air/fire........ After checking the fuel system I would move onto the 'fire' part of the program...... coil, dizzy, connections, grounds etc........
Junior User
Joined: Jun 2013
Posts: 63
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When you do the carb rebuild, take plenty of pics during dissasembly so you can orient parts during reassembly. Helped me a lot when I rebuilt the carb in my 302. Also, take the time once you get it re-installed to go through the ALL of the initial adjustments. Depending on where you got your rebuild kit, it should have these procedures included. If not, they are in the factory shop manual and/or the Haynes manual I believe. Hopefully this fixes or at least improves the problem.
Senior User
Joined: Mar 2017
Posts: 395
Likes: 1
From: Everton MO
funny thing i have a 78 ford 300 i6 and it did the same thing i tried a carb rebuild and it got worse, i bought a ultrasonic cleaner like $40 and cleaned the carb so it was very clean. then i replaced all the vac lines and fuel filters. start by adjusting the idle speed low and the mixture high in order to get a low vac advance at idle. make sure your dist. advance is connected to the port right above the throttle blades and keep adjusting the idle speed down and the mixture up so you dont over advance the timing, then get the idle to about 500-700 rpms and adjust the mixture to get perfect mixture. you could also have a bad seal that opens when it heats up which is causing the bucking after a certain time. i would get a vac gauge if i were you. hope this helps!!
Postmaster
Joined: Nov 2011
Posts: 2,553
Likes: 10
The best troubleshooting sequence is usually make sure fuel delivery to the carb is OK (plugged pickup? weak/collapsing rubber lines? plugged filter?). Then make sure ignition is all OK. Then carb.
That said, after I had done the above when I had intermittent stalling, a rebuilt carb cleared it up.
That said, after I had done the above when I had intermittent stalling, a rebuilt carb cleared it up.
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