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Joined: Nov 2005
Posts: 1,125
ChatMaster - 1,000
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OP
ChatMaster - 1,000
Joined: Nov 2005
Posts: 1,125 |
My ”˜41 special deluxe is surging. It is most noticeable above 40 mph, and is almost constant. It has a new valve job, all plugs are firing, and the carburetor is freshly rebuilt. Any thoughts?
Thanks,
Sid
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Joined: May 2005
Posts: 1,295 Likes: 2
ChatMaster - 1,000
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ChatMaster - 1,000
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Did you clean or change the fuel filter ? 
p.k.
1956 BEL AIR 2 DOOR HARDTOP
I've spent most of my money on Booze,Women and mechanical things. The rest I just Wasted........
Remember , I'm not Always Right. But I'm Never Wrong !
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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 |
Most common cause of surging as described is timing advanced too far or lean fuel mixture. That can be caused by a a vaccuum leak or lean condition in carburetor settings.
Leak could be cracked insulator under carburetor, intake manifold to head leak or some vacuum hose leak like for wipers or vacuum shift.
Gene Schneider
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Joined: May 2018
Posts: 265
Backyard Mechanic
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Backyard Mechanic
Joined: May 2018
Posts: 265 |
Had a similar problem with a '64 Plymouth when I was a teenager. The problem was a loose distributor clamp. Tightened it down and the surging disappeared.
Why do I spend more time under my car than in the driver's seat?
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Joined: Nov 2005
Posts: 1,125
ChatMaster - 1,000
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ChatMaster - 1,000
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Thanks guys. I’ll check it out. Sid
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Joined: Nov 2005
Posts: 1,125
ChatMaster - 1,000
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OP
ChatMaster - 1,000
Joined: Nov 2005
Posts: 1,125 |
We checked for leaks and found none. Changed the fuel filter, and the old one still looked good. Retarded the timing a few degrees, and that made the difference. Surging is gone. Thanks guys.
Sid
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