1955 rough idle problem

[gregarsenault]

I have a 1955 with the 292 and 2 speed auto. The engine used to run as smooth as silk, but earlier this summer it developed a real ruff idle. It does smooth out off idle speed, but my mileage has dropped significantly. It also now seems to flood very easily after being running and shut off, and I smell gas like it is running too rich. After the problem started I put an electric fuel pump on to eliminate the hard start cold condition. I have also put on new wires, plugs, and an electronic point replacement kit.

I was thinking maybe the float is out of adjustment?I have tried to readjust the idle mixture (needle valve looks okay) and played with the timing a little but to no avail. Any ideas?



Thanks very much.

[Alan H. Tast]

I think you're not addressing the source of the problem, the carburetor. Either you've got a bad power valve, accelerator pump, bad vacuum advance on the distributor, or an improperly-functioning choke. At the very least, I think going through the carburetor and overhauling it would be a good idea, if for nothing else than to replace dried-out or rotten gaskets and seals.

[Paveway]

I agree with Alan. You may also have a vaccum leak somewhere. The carb float may also be out of adjustment. Garbage in the needle/seat of the carb float will cause a rich condition also.