1970 3000 GAS MISSING ON one cylinder?

ferrarifarms84 · May 11, 2016

I recently aquired a ford 3000 gas,8 speed on a trade. I converted the horizontal exhaust to a vertical exhaust and noticed tonight it has a miss. I determined its the middle cylinder that isnt firing by pulling off the plug wire and no change in engine.. i swapped the plug and wire off another 3000 i have and it didnt make a difference. plug has spark. i checked points and cleaned them and they look alright. the oil and antifreeze both look good, no smoke at all out of exhaust, and no bubbles in radiator. i did not check compression yet but when i took the plug out i cranked it over and it felt and sounded like it had decent compression just with my hand over the hole. I am stumped and hope its nothing serious!! Any ideas or suggestions much appreciated! -John

Fordfarmer · May 11, 2016

Check the compression.
May be a bent pushrod or stuck valve. If a valve isn't
opening, or only opening part way, it could cause a
miss.

Destroked 450 · May 11, 2016

Check the compression, it takes a min of 100 psi for a cylinder to operate properly. If compression is good check for a leak where the manifold mates to the head. If compression is low pull the valve cover an check for bent push rod, broken valve spring, valve lash adjustment.

souNdguy · May 12, 2016

agreed with the others, if that hole has spark, then do a proper comp test on it. just blowing some air tells you a little, but not enough.

1970 3000 GAS MISSING ON one cylinder?

ferrarifarms84

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Fordfarmer

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Destroked 450

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souNdguy

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