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Running rough |
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49chevy 
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Joined: 23 June 2019 Location: Illinois Status: Offline Points: 4 |
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 Topic: Running roughPosted: 24 June 2019 at 4:07am |
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I have a 1947 Cj2A that I am rebuilding and I am having trouble getting to past quarter/half throttle it starts right up within one revolution of the motor idles beautifully but as I increase the throttle it starts to stutter and will not increase rpms. I have installed new tank, lines, pump, carb, coil, plugs, points and condenser and set the points. any help would be greatly appreciated
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Rus Curtis
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Joined: 25 Mar. 2010 Location: Alabama Status: Offline Points: 1733 |
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Posted: 24 June 2019 at 4:16am |
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What about timing?
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Rus Curtis
Alabama 1954 CJ3B Bantam T3-C |
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TERRY
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Sponsor Member Joined: 22 May 2007 Location: BOULDER COLORADO Status: Offline Points: 3400 |
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Posted: 24 June 2019 at 3:15pm |
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With the engine off, look down the throat of the carb as you move the throttle. You should see a stream of gas if the accelerator pump in the carb is working properly. If it is not, you will have a lean condition when trying to accelerate until the venturi effect of the carb catches fuel supply up with the incoming air. Also the adjustment of the pump and metering rod are interdependent, and if not correct will cause hesitation, poor performance etc.
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BOULDER 48 2A
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49chevy
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Joined: 23 June 2019 Location: Illinois Status: Offline Points: 4 |
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Posted: 24 June 2019 at 3:21pm |
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Okay thank you very much I will try that
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oldmansimek
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Joined: 23 Apr. 2019 Location: CT Status: Offline Points: 177 |
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Posted: 24 June 2019 at 3:27pm |
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Check to make sure you have the correct rotor for your distributor. Also might be a long shot but if you or someone else rebuilt the carburetor the metering rod is very easy to bend when installing, previous owner did this to mine and it ran exactly as you are describing.
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oldmansimek
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Joined: 23 Apr. 2019 Location: CT Status: Offline Points: 177 |
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Posted: 24 June 2019 at 3:30pm |
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Forgot to mention you should really do a compression test as you might be wasting your money with parts.
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49chevy
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Joined: 23 June 2019 Location: Illinois Status: Offline Points: 4 |
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Posted: 24 June 2019 at 3:47pm |
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I have a consistent 90 psi on all four cylinders
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48walker
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Joined: 17 Mar. 2017 Location: Wisconsin Status: Offline Points: 366 |
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Posted: 26 June 2019 at 1:35am |
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Was the distributor rebuilt? I've seen other members post about having similar issues caused by weak distributor springs.
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