Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks



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Joined: Sep 2007
Posts: 654
Likes: 3
Oil Can Mechanic
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Oil Can Mechanic
Joined: Sep 2007
Posts: 654
Likes: 3
my chevy has always had a stumble while crusing. it does not seem to happen under acceleration and I just noticed it (seems) to happen worse when I use the headlights, it is more pronounced when I advance the timing a bit using the octane selector. I have changed carburation in the past because it felt like a carb problem with no improvement. any ideas?


J Franklin
Filling Station - Chevrolet & GMC Reproduction Parts


Filling Station


Joined: Jan 2002
Posts: 30,701
Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701
Likes: 141
Is it a serge? A serge is a slight bucking when running at a steady speed usually between 40-60 MPH. My 1939 will do this if the timing is advanced too far and was typical for 1939's. For the 1939 it was a case of a lean fuel mixture + too much advance. Your metering rod may be improperly adjusted or incorrect metering rod and main jet for a 1936. Do you know what year carburetor you are running? Also if the heat riser is stuck and the intake manifold is getting too hot this can happen. Possible weak condenser or coil, especially if its worse after driving some distance and every thing is heated up.


Gene Schneider
Joined: Sep 2007
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Oil Can Mechanic
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Oil Can Mechanic
Joined: Sep 2007
Posts: 654
Likes: 3
I have replaced the coil, good vacuum advance, 4000 miles on a rebushed rebuilt dist. Maybe i'll next change the condencer. The carb was changed it now is a modern holley of a 200ci ford 6 with an electric fuel pump and a regulator at about 2 1/2 lbs. The symptoms haven't changed.


J Franklin
Joined: Jan 2002
Posts: 30,701
Likes: 141
ChatMaster - 25,000
Offline
ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701
Likes: 141
I would have replaced the condenser first...cheapest and easy to do....There are no bushings in a 1929-62 distributor. :confused:


Gene Schneider

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