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-   -   Rough running-suddenly (http://squarebirds.org/vbulletin/showthread.php?t=11081)

'59 Jim 05-01-2011 10:43 AM

Rough running-suddenly
My '59 went from running great to running really rough and stalling overnight. I think it's probably a vacuum line. There's a sucking sound, and she's not losing any fluids. Am I probably right to change all the vacuum lines, and is there something else it might be? :confused:

Thanks in advance for the help,

jopizz 05-01-2011 11:24 AM

I would plug the vacuum lines going to the brake booster and fuel pump and see if it helps before replacing everything. It could be dirt in the carburetor as well as a number of ignition related items. A few things to check are the vacuum advance in the distributor and the coil resistor.

simplyconnected 05-01-2011 03:00 PM

Jim, vacuum line is readily available in auto parts stores, everywhere. If you car's vac lines are hard and brittle, by all means change them. Bring a piece in to the store and tell them how many feet you need.

Auto parts stores also have the little tees for windshield washer lines and vacuum lines. Over the years, polymers tend to bake out of the plastic, then they break all by themselves. Replace with nylon when possible.

A broken vacuum line (anywhere) will cause your engine to run too lean, so fix the problem at your earliest convenience. If you cannot find the leak, start at the intake manifold, plug the vacuum hose with a bolt, and continue downstream until you get to the problem.

One of the 'trickiest' leaks to find is in power brake boosters. When they 'let go', it's usually a large vacuum leak. Good luck. - Dave

redstangbob 05-01-2011 03:26 PM

Take a look at your choke, it may be stuck closed. Good luck, Bob C

JohnG 05-01-2011 09:00 PM

Suppose he cuts into a vaccum line, puts a T in, and runs a line to a vaccum gauge.

a) what should normal behavior show up as?

b) what would indicate a leak?

One could easily run the temporary line inside the car and watch it while driving.


simplyconnected 05-02-2011 02:32 AM

Good question, John
The best answer I can give is, go to this web site where they have an animated display of gauges (and how they should read with different faults):

Eighteen inches of mercury is healthy vacuum. Yes, some get over twenty, but power boosters, etc., depend on eighteen as a 'standard'.

I like the idea of watching a vacuum gauge as you drive because you can see what happens at the light, when your trans shifts, when you stop, etc. - Dave

Astrowing 05-02-2011 11:46 AM

18 inches and steady vacuum is what you are looking for. Fluctuations can be fuel, ignition or valve issues. I would change out the fuel filter and see if that improves it. My problems with engine idle quality have been almost always fuel related and/or dirt in the carbeurator.

ayrwoof 05-15-2011 12:24 PM

h ross perot
Ross tried to warn us about that giant sucking sound.
hold hand over carb air inlet while idling . close it off alittle at a time
if idle speeds up you got a leak or weak idle ciruit.
put in a lunati 60001 cam and my idle for power brake is way up
and it purrrrs.

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