Join Date: Mar 2006
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Popping through carb
A little background. 83 F150 4wd 302 carb'd. Original motor threw a rod, but was running fine before. Found an 86 302 out of a Mustang. Swapped motors, used our intake and dizzy because it didn't have one.
Put #1 at TDC on Compression stroke (piston up, timing mark on 0) Correct? Started motor, found some minor vac leaks, and son broke ears off carb where you mount it, changed carb from my other truck that we just drove. Set timing at 9 degrees for now, idles like a new kitten. Firing order is 1-5-4-2-6-3-7-8 checked 3 times. Wires came off other engine and were good.
Now to the problem. Idles good, but when you give it a good kick of the throttle it pops through the carb, also when you let out the clutch and start to go it pops. Not a pop-pop-pop-pop, but a single pop everytime you give it gas. You can slowly give it gas by hand out of gear and it revs fine. Do I still have a vac leak or do you think the cap or wires messed up from the time it took to swap them between motors ( a week )or do I have the dizzy in wrong? I was assured the motor was good, they are reliable and I do believe them.
Sorry for the long post but I wanted to give all the info I could.