The Ford Barn

joltesvig · 07-06-2017, 10:27 AM

Standard 4 banger engine in my 31 coupe. The plugs look good and so do the points. When it warms up a little it starts missing /stumbling when I step on it a little. The manifold vacuum tube is not loose or leaking. It starts and idles fine. Maybe needs a new condenser...is there an easy way to know other just replacing it? Any other ideas? Worried it's going to die out completely on the road one day!

RawhideKid · 07-06-2017, 10:38 AM

How old is the distributor body and rotor? If you have one of the Red distributor bodies they are known for jumping spark between 1&2 and between 3&4 internally, so it could be the problem.

Where is the GAV set? If it is more than a full turn open it can cause too much gas into the engine, which can cause a coughing.

Tom Wesenberg · 07-06-2017, 07:01 PM

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Hold the coil wire 1/2" from a head nut, and you should get a hot blue spark. If you do, then the cap or rotor could be bad as just stated.

If the spark is wimpy yellow, then try a new condenser. If that doesn't help, then try another coil.

07-06-2017, 10:27 AM	#1
joltesvig Senior Member Join Date: May 2011 Location: Carthage, NC Posts: 147	Engine misses, stumbles Standard 4 banger engine in my 31 coupe. The plugs look good and so do the points. When it warms up a little it starts missing /stumbling when I step on it a little. The manifold vacuum tube is not loose or leaking. It starts and idles fine. Maybe needs a new condenser...is there an easy way to know other just replacing it? Any other ideas? Worried it's going to die out completely on the road one day! __________________ John the Model A Rookie from North Carolina

07-06-2017, 10:38 AM	#2
RawhideKid BANNED Join Date: Apr 2017 Location: Lower Left Coast Posts: 469	Re: Engine misses, stumbles How old is the distributor body and rotor? If you have one of the Red distributor bodies they are known for jumping spark between 1&2 and between 3&4 internally, so it could be the problem. Where is the GAV set? If it is more than a full turn open it can cause too much gas into the engine, which can cause a coughing. __________________ Before Walmart you had to buy a ticket to the fair to see a bearded lady!

07-06-2017, 07:01 PM	#3
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: Engine misses, stumbles Sponsored Links (Register now to hide all advertisements) Hold the coil wire 1/2" from a head nut, and you should get a hot blue spark. If you do, then the cap or rotor could be bad as just stated. If the spark is wimpy yellow, then try a new condenser. If that doesn't help, then try another coil.