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Thread: lean idle and part throttle

  1. #1
    DX User
    Join Date
    Sep 2009

    lean idle and part throttle

    The symptoms:
    1 car will not idle
    2 under throttle the car missies intermittently, as though it may be a lean serge
    3 no identifiable vacuum leaks
    4 gas level in float bole is good
    5 has carburetor

    Car history:
    244,631 miles
    doesn’t use any oil
    oil and filter changed approximately every 3000
    up until this morning it ran fairly smooth
    no leaks, oil or otherwise

    The plea for help:
    this car is my daily driver and I love it like my wife it is a very good car but a bit to complicated compared to my 72 Peterbilt and 78 Ford f-250 , smart carburetion and computer, so ill take any and all help available, thanks. If you need any more info just let me know
    Last edited by detroit series 149; 09-02-2009 at 03:37 PM.

  2. #2

    2oodoor's Avatar
    Join Date
    Jun 2006
    86 LX JDM B20A

    Re: lean idle and part throttle

    Seafoam or BG 44k fuel system cleaner in the tank, gummout carb spray in the top of the choke and venturi area
    Check the coolant level
    A list of possibility with this thing so start with the simplest maintenance procedures first
    Check vacuum advance is working on the distributor, getting vacuum? pull the hoses off while running and see if the rpm changes

  3. #3
    DX User
    Join Date
    Sep 2009

    Re: lean idle and part throttle

    Coolant level is fine and fluid is relatively new, vacuum advance is working on #2 got massive vacuum #25 has not got vacuum as the engine is worm. Also when I close the choke flap manually it runs much better. I have checked the venturi and they are tight. I have also cleaned the carb twice with gumout. Thanks for the help

  4. #4

    Dr_Snooz's Avatar
    Join Date
    Jun 2007
    1989 Accord LX-i
    Fresno, California

    Re: lean idle and part throttle

    Hey bud, welcome to the board! When is the last time you did a tune up on the car? It almost sounds like an electrical issue to me. When you say it won't idle, what does that mean exactly? Does it die, or rattle the fillings out of your teeth or what? Let us know and good luck.

    "I like to take hammers, and just break stuff, just break stuff." - Beavis

    1989 Honda Accord LX-i Coupe, 240k miles, MT swap, rear disc swap

    Shop manual downloads available here: CLICK TO VIEW

  5. #5
    DX User
    Join Date
    Sep 2009

    Re: lean idle and part throttle

    it definitly rattles out your fillings and die if no throttle iv dun tune ups regularly though i have not changd the timing belt yet I was going to in about 5000 miles (it was last dun about 45000 ago)

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