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Whats wrong with my VW bug?(1973)?

Every time my bug heats up it dies... I can't keep the car running.. I've changed the spark plugs and the wires... I have also tried a whole different carb... (not a new one tho)... After it warms up as soon as I take my foot off the gas it just wants to die... THANKS....

Update:

Thanks for the first 3 answers,but I have tried all that already and the car is still dying...

Update 2:

okay well my timing is set way off because the car wont run when its timed where the book says it should be timed... and the hoses are all cracked so were going to change them in the next couple of days so I will let you cats know.... thanks for the help....

-HEATHER DISCORD-

9 Answers

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  • Anonymous
    1 decade ago
    Favorite Answer

    There is a little screw in the back (throttle) you can adjust it with a screwdriver.

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  • 1 decade ago

    Like everyone else this sure sounds like a vacume leak.

    Get a can of carb. cleaner and after the engine warms up, spray it on the carb and its connection to the manifold. Also spray it on the various vacume hoses and hose connections. Its a cheap $2 trick .. when the fluid gets sucked in by the leak, your leak is cured for a few seconds and the car will run better for a bit. If that happens you then knot 'what' and some experimentation will show you 'where'. If not.. try the following

    1) Disconnect the choke and wedge it open so that there is no question that it is operating correctly (wedge it with something large enough that won't get sucked into the carb.

    2) Disconnect and plug each vacume hose one at a time..

    3) Electrical: Unlikely but look to see that the wires on the coil are firm and clean. It is remotely possible that, when the metal warms up it looses contact .. (again .. an unlikley scenario but it IS possible).

    4) Fuel line: When the carb is closed it will suck more fuel so a bad fuel pump might not be noticed. BUT once it warms and the carb opens your fuel might not be sufficient. If you have a clear fuel filter check the level as the car is chugging itself to death. If you don't install one and check it. (Plus it will keep your fuel filtered ). If the fuel pump is bad, consider installing an electrical one. (a simple job)

    Hope that helps..drop me a line a yahoo and let me know what it was..

    Source(s): ca_surveyor@yahoo.com
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  • bobweb
    Lv 7
    1 decade ago

    First, make sure the carburetor's choke butterfly plate in the very top of the carburetor mouth is fully opened as the engine heats up. It needs to be mostly closed at first to start a cold engine because you need an extra rich fuel mixture then. But when the engine's hot, the choke plate should be wide open to allow as much air as possible into the carburetor. Next, try setting your idle speed higher by turning the idle set screw in about one turn or so. This should open the throttle plate a little more so that when you let your foot off the accelerator pedal the throttle plate won't go fully closed and stall the engine. Finally, check your emissions related items like a vacuum controlled valve that keeps the throttle plate from closing too quickly when you brake quickly from road speed.

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  • 1 decade ago

    I played with mine purposely. Carb adjusting. Okay, if it is not your problem as you say. Check your timing. Too far advanced with a lean mixture will also die on you(but you get better gas mileage). The individual that said spray the motor with engine cleaner.....use brake cleaner instead. See if you can get the car to die or speed up while it is still cold and idling. Focus on hose connections and intake gaskets. If it does due to the spray, you have found the source of the problem...if it is a vacuum leak.. If not there...

    There is the possibility that the valve clearances are to tight... holding open to cylinders on compression stroke (no compression).

    Temperature wise that is about it. I saved the valves for last cause it is the dirtiest job.

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  • 1 decade ago

    Change out your coil and condensor, if the coil gets hot to the touch you need to change it out, also if the condensor is bad no matter what you change the current has to go through. When car is running spray some carb cleaner around base of carb., if it speeds up when you sparay you have a bad gasket on your carb, also check the other ideas you have received here, sooner or later you will get it.

    Source(s): VW BEETLE OWNER.....1974 Sedan.
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  • 1 decade ago

    If you are unable to adjust idle to where it will stay where you set it you probably have an intake manifold leak. Either where it bolts to the head or the boots where the three piece manifold joins together or both. Try it.

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  • 1 decade ago

    look for a vacuum leak along the intake manifold, at the boot area. there are 2 boots. they like to split due to age.

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  • 1 decade ago

    this almost sounds like a bad vacuum leak, either that or it is a problem with vapor lock from badly routed fuel lines.

    had that problem with a 63 bug..

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  • Anonymous
    1 decade ago

    throttle body valve stuck

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