Please help 302 carb issues
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Fleet Mechanic
Joined: Apr 2004
Posts: 1,443
Likes: 5
From: Willamette Valley, Oregon
Please help 302 carb issues
I have a 74' 302 in a 56, I put a rebuilt Motorcraft 2bbl from a company in FL on, I sent the "core" back before tuning (mistake).
Now I have a bad stumble/miss at constant speed. Idle is OK, not perfect, but OK. Accelleration, as long as the pedal is moving down, is good, but at a steady speed it is bad, runs rough. Feels like it is starving for fuel? Is this a main jet issue? What else could it be? I am lost, please help!
Now I have a bad stumble/miss at constant speed. Idle is OK, not perfect, but OK. Accelleration, as long as the pedal is moving down, is good, but at a steady speed it is bad, runs rough. Feels like it is starving for fuel? Is this a main jet issue? What else could it be? I am lost, please help!
Thread Starter
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Fleet Mechanic
Joined: Apr 2004
Posts: 1,443
Likes: 5
From: Willamette Valley, Oregon
Im having a difficult time finding Motorcraft main jets, in the "old days" we used to drill out jets. I have one spare pair of jets, they are #54s just like what was in this unit (in a 302 with a rebuilt , new to me, carb) I drilled the #54s out with #52 bit, it seems to be somewhat better. First of all, can anyone tell me what # jets should be in a 302, 2bbl, ???I was told has mild cam (not sure if its true).
Second, anyone have a conversion chart, or just a good handle on what drill size = what jet size? if a #54 jet is the same as a #54 bit, (and it is) then when I drilled it with a #52 drill bit which is bigger, did I make it a #52? or a #56? ....is a #52 jet smaller than a #54? I am thinking about drilling one more size to a #50 bit, is this crazy too big? or is it reasonable that it may need this much fuel, it still seems starved, float level is good, vacuum is good, and drilling to a #52 did help a but... HELP!!
Second, anyone have a conversion chart, or just a good handle on what drill size = what jet size? if a #54 jet is the same as a #54 bit, (and it is) then when I drilled it with a #52 drill bit which is bigger, did I make it a #52? or a #56? ....is a #52 jet smaller than a #54? I am thinking about drilling one more size to a #50 bit, is this crazy too big? or is it reasonable that it may need this much fuel, it still seems starved, float level is good, vacuum is good, and drilling to a #52 did help a but... HELP!!
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