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Thread: Engine dies at stop light. Need advice on adjustments

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  1. #1
    Join Date
    Feb 2007
    Posts
    18

    Default Engine dies at stop light. Need advice on adjustments

    1963 88 NADA with Solex carburetter. Idle, acceleration and running are fine. When pulling up to stoplight and clutch in, engine wants to die. Foot or hand throttle increase keeps it running. Really would prefer not to increase the idle. Suggestions and advice? Thanks

  2. #2
    Join Date
    Dec 2010
    Posts
    400

    Default

    vacuum leak !! .......... check that spring on the flapper valve atop the carb intake too.

  3. #3
    Join Date
    Feb 2007
    Posts
    18

    Default

    How do I check for a vacuum leak? Thanks

  4. #4
    Join Date
    Jul 2020
    Location
    UK
    Posts
    301

    Default

    Check the idle mixture strength is correct, may be slightly weak. If you snap the throttle open from idle then back to idle does it stall then? WS manual suggests if it does when the mixture is set correctly , the idle speed may be too low

  5. #5
    Join Date
    Feb 2007
    Posts
    18

    Default

    Thanks, I'll check it out.

  6. #6
    Join Date
    Dec 2010
    Posts
    400

    Default

    unless you have a manifold to head leak which would be harder to find just look at the hoses coming off the intake manifold and carb. removing the hoses one at a time and capping the connection at the manifold would result in a slight increase in rpm. you can also hear a leak sometimes, for the hard to find ones spray some either or something around the suspect leaking spot and you'll definitely hear the rpm jump.
    i assume you have a regular 2.25 litre so there are not many places for it to leak, brake booster, vacuum advance, there just are not many places to lose vacuum. more often it's carb adj.

  7. #7
    Join Date
    Feb 2007
    Posts
    18

    Default

    Thanks again.

  8. #8
    Join Date
    Feb 2007
    Posts
    18

    Default

    Hello. I adjusted the mixture screw and the idle. Not much apparent change using the mixture screw, but seems to idle better at a stop after driving, so I guess it did something to cure the problem. Workshop manual says 500 rpm idle, but I can't get under 900.
    I would also like to check the timing. Timing cover is on the flywheel and looks like I need to remove it from underneath as my arms just aren't that long to reach it from the top. Any suggestions how to use a timing light as the workshop manual uses a 12v bulb. Thanks again for advice and suggestions

  9. #9
    Join Date
    Nov 2021
    Location
    Niagara
    Posts
    37

    Default

    In all carbs not able to achieve low idle often means your smallest jet is plugged or restricted. You are likely running (barely) on a secondary (main) at 900rpm with your idle screw balancing act. Disassemble and clean your carb.

  10. #10
    Join Date
    Feb 2007
    Posts
    18

    Default

    Will check the carb. Thanks. I think the timing pointer is on the flywheel, not the crank pulley. Would I put the timing light on the front plug in any case?

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