1955 210 Sedan 235 engine trouble

[madebugaboo]

I rebuilt the the original 235 engine out of my 1955 chevy 210 4 door sedan. Ran great until a couple months ago when it started stalling. I have replaced the carb (another single barrel rochester), vaccum advance, points, condensor, rotor, coil, gas filter, and it was tested for vaccum, timing, and compression (all came out good). It starts and runs, but idles high. Not sure where the problem is. I have two shop manuals for this year vehicle/engine and have tried all the suggestions as well suggestions from mechanics. Does anyone have any ideas what to try next? HELP!

[MrPbody]

Define "stalling"...

When you replaced the carb, did it come from a reputable source as being rebuilt and ready?

Have you checked the fuel volume coming to the pump from the tank? Have you checked the amount of vacuum the fuel pump is "pulling"?

Without more specific information about the problem, those are my best suggestions.

Jim

[Blue Bowtie]

Does this particular vehicle have the Bendix Treadle-Vac power brake system? (Been there, in case you need any help with it if that turns out to be a vacuum leak).

[bobss396]

Rule out a gross vacuum leak first. if you can get it to stay running, with the air cleaner off, place your hand over the carb airhorn. If the idle picks up and it smooths out, you have a vacuum leak.

Temporarily clamp off the vacuum hoses one at a time with a pair of flat jaw pliers, large needle nose pliers are what I use. Look for any open ports on the carb and plug them.

Next, spray around the base of the carb where it meets the manifold. The 1-barrel carbs are also famous for the two sections coming loose and causing a vacuum leak.

Bob

[comp]

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