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58PackardWagon
07-14-2007, 11:27 PM
Once my Lark goes out on a trip (about 4 miles) when I get to a stop sign it stalls and run rough. The dwell is at 45 degrees at 600 rpm. Timing is on. I checked in the dark and no spark with the plug wires. Battery and generator are good. Oil pressure is fine. New carb, new intake manifold and exhaust manifold, along with a new heat riser (stuck heat riser was problem #1). When it stalls at a complete stop, it starts out ok. Once I am moving it runs very well. The only thing I can think of is that it has a fuel pump on the motor which is working well and it has an electric fuel pump. I disconnected the electric one. Would this be restricting fuel enough at an idle for it to stall out or should I be going in a different direction? Should I check the compression? Please advise your thoughts. It is a 62 Lark with a 6 cyl and an automatic. Thank you.

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58 Packard Wagon (Park Green)
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57 Packard Wagon
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63 Lark Custom 2 Door Sedan R2

Guido
07-15-2007, 09:25 AM
I am confused (easily done ;)) as you state there is no spark but then talk about fuel issues. Do you have spark when it happens or is it possible the coil is breaking down when it gets hot?

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Guido Salvage - "Where rust is beautiful"

Studebaker horse drawn doctor’s buggy; Studebaker horse drawn “Izzer” buggy; 1946 M-16 fire truck; 1948 M-16 grain truck; 1949 2R17A fire truck; 1950 2R5 pickup; 1952 2R17A grain truck; 1952 Packard 200 4 door; 1955 E-38 grain truck; 1957 3E-40 flatbed; 1961 6E-28 grain truck; 1962 7E-13D 4x4 rack truck; 1962 7E-7 Champ pickup; 1962 GT Hawk 4 speed; 1963 8E-28 flatbed; 1964 Avanti R2 4 speed; 1964 Cruiser and various other "treasures" (including a 1959 IH B-120 4 wheel drive and numerous Oliver and Cockshutt tractors).

Hiding and preserving Studebakers in Richmond, Goochland & Louisa, Va.

58PackardWagon
07-15-2007, 10:14 AM
What I meant was that I have no arc or spark jumping between the wires. Plugs seem to be firing and working correctly.

1961HAWK
07-15-2007, 10:20 AM
what about your vacuum? almost sounds like a vacuum leak.
check your vacuum. if it is good go ahead a set your carb with the vacuum gauge to peak vacuum. you vacuum advance could have a leak so check it too.


Erin Hays
1961 Hawk
1962 Lark
1963 Wagonaire

58PackardWagon
07-15-2007, 12:51 PM
How do I check the vacuum? Do I need a special tool?
Where do I find this discussed in the shop manual?