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Why would an 86 Century wagon v6 carburetor have a hard time starting when it is cold and why do you have to step on gas pedal to make the choke close?

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2005-10-20 23:31:03
2005-10-20 23:31:03

There are "steps" on the choke cam that pull the gas pedal up to a high speed idle when the choke is on. If you don't step on the gas pedal once before starting, the carburator/choke assembly cannot function properly.

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It is a carburetor where the engine coolant is routed through the choke system of the carburetor. When the coolant is cold the choke will close. As the engine coolant heats up it opens the choke.

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That part is called a bimetalic spring with housing the purpose of this part is to coil up in cold temperature and uncoil when heated, that cause the choke blade to open and close.

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Check the choke throttle and linkage for binding that won't allow the choke baffle to close partially when you let off the gas. A good carburetor cleaner will dislodge any gunk or goop - follow the instructions on the can.

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The choke light on a 1984 Chevy El Camino will come on if the choke fails to open or close. The choke should be visually inspected to verify functionality.

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You need to take you car to a mechanic. It is obvious you do not know what you are doing. Your battery is in the electrical system. Your choke is in the fuel system. They are separate. It is normal to pull out your choke to start your engine. It is not normal to have your choke out to run your engine. As soon as your engine starts, you should push your choke in. When you pull out your choke, you close the air going into your carb. Then you push in the choke to allow air to flow through your carb. That lets you speed up or slow down. If it won't run with the choke pushed in, try pushing the choke in slower.

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Close choke (if equiped), if not, consider servicing the carby or the fuel pump. * This answer is answered in assumption that it runs after start. If you have to put petrol down the carby to keep it going, consider servicing/replacing the carby

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for close range use a modified it is a really versital choke but what i use for long range is a full i got 5 ducks with a full choke i know it ain't alot but i just started last year

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There is a tool known as a choke gauge. It is a tapered length of metal that is placed in the bore, and measures the width of the muzzle. Or- shoot the shotgun, and determine how it patterns, Purpose of a choke is to to open or close a shot pattern- and proof is in what the gun does.

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There are several systems used by Briggs for choke control. Auto choke engines are equipped with a heat sensitive bi-metal coil attached to the exhaust. When cold, the coil closes the choke plate. When heated by exhaust gases, it opens the plate. Most other models have a manual lever to open and close the choke or a primer bulb system.

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When the engine is first started, a very rich air/fuel mixture is required because cold fuel vaporizes slowly. The "choke" at the top of the carburetor provides the richer mixture by closing and "choking off" the carburetor's air supply. The choking effect also creates an area of low pressure inside the throat of the carburetor that helps to pull additional fuel through the main metering circuit. At idle there isn't enough air flowing through the venturi to pull fuel through the venturi discharge nozzle. By temporarily choking off the air supply, however, manifold vacuum rather than venturi vacuum helps to draw the extra fuel through the main metering circuit. When the choked engine is cranked, fuel is pulled into the engine through the idle port, the transfer port and the main metering circuit. Combined with the reduced air supply, it creates the extremely rich mixture that's needed to start a cold engine. As soon as the engine starts, it needs air to keep running and to offset the super rich fuel mixture. The choke plate shaft is offset slightly to one side so incoming air will tend to push it open. On many older carburetors, a vacuum operated piston in the choke housing or carburetor casting was used to pull the choke plate partially open so the engine could receive sufficient air to keep running. These pistons were prone to gum up and stick, causing hard starting and stalling problems. In most later model carburetors (but not all), the vacuum piston has been replaced with an external "choke pull-off" vacuum diaphragm. The choke pull-off is also attached to the choke linkage where it pulls the choke plate open slightly as soon as the engine starts. On some carburetors, a pair of choke pull-offs are used to give a more progressive opening. If the choke pull-off fails to work (because of a vacuum leak or ruptured diaphragm), the engine may be hard to start or stall. The amount by which the choke is pulled open can be adjusted by bending the "U-shaped" pull-off linkage. If the linkage is not properly adjusted, however, it may open the choke too far, admitting too much air causing the engine to stall. Once the engine starts and begins to warm up, the fuel mixture is gradually leaned out until the choke is fully open. This job is performed by a temperature-sensitive bimetal spring attached to the choke plate. The bimetal spring may be located in a well in the intake manifold where it is heated by exhaust gases flowing through the crossover passage, or it may be located inside a plastic housing on the carburetor itself. The choke housing may be heated one of three ways: by hot air siphoned up through a pipe in the exhaust manifold that then flows through the housing and enters the carburetor; by an electrically heated element inside the housing; or by engine coolant circulating through a hose attached to the housing. Whatever the source of heat, the bimetal spring reacts by unwinding to open the choke (which may occur in as little as 45 seconds or less on an emissions controlled engine). When the engine is shut off and allowed to cool, the bimetal spring contracts, winding up tighter to pull the choke shut. But since the choke linkage is also attached to the "fast idle cam," the choke won't close until the linkage is pumped at least once to reset the cam. On automatic chokes that use an electric heating element, a temperature sensitive contact switch may be used to break the flow of current to the heating coil when the housing is hot. When the choke is defective or not adjusted properly, it can make an engine hard to start. The engine may also stall or die after it is started. Problems with the operation of the choke will result whenever heating is lost at the choke housing. On carburetors that draw heated air through a pipe in the exhaust manifold, rust can corrode the inside of the pipe blocking air flow. Or the pipe can simply rust off. When this happens, the bimetal spring doesn't heat up quickly enough causing the choke to open too slowly. The result is a rich fuel condition resulting in a rough idle, excessive fuel consumption and high emissions. On carburetors that use an electric heating element, a loose wire or poor ground connection can prevent the choke from opening. The choke housing should feel hot to the touch within a minute or so after the engine is started if its heat source is working correctly. The choke can be adjusted to alter the temperature at which it closes and opens, which also enriches or leans the starting fuel mixture. The choke is adjusted by loosening the screws that hold the choke housing and then rotating the housing. This changes the relative position of the bimetal spring inside which puts either more or less tension on the choke. Rotating the housing to increase tension on the choke (which you can detect by holding the choke plate or watching it move) will make it close at a higher temperature and enrichen the mixture. Rotating the choke housing to decrease tension will make it close fully at a lower temperature and produce a somewhat leaner mixture. Notches are provided on some housings for reference. The vehicle manufacturer will often specify how many notches rich or lean the choke is to be adjusted. On many late model carburetors, rivets are used instead of screws to discourage tampering with the choke housing adjustment. But this doesn't prevent adjustments because the rivets can be drilled out. Once the adjustment is made, new rivets or screws can be installed. The rate at which the choke opens is critical. If the choke doesn't open quickly enough, especially during warm weather, the mixture becomes too rich and increases carbon monoxide emissions. On the other hand, if the choke comes off too quickly, especially during cold weather, the mixture can lean out causing the engine to stall or to stumble when the throttle is opened quickly. The choke pull-off plays an important role here by modifying the rate at which the choke opens during warm weather. Some carburetors are equipped with two choke pull-offs. The combination of two choke pull-offs provides a progressive rate of opening that changes according to temperature. The primary pull-off opens the choke a bit when the engine starts to keep it running. The second choke pull-off operates through a thermal vacuum switch that senses the temperature of the heated air entering the carburetor. During cold weather, the bimetal spring in the choke housing will open the choke fully before the second choke pull-off has any effect because the choke housing warms up faster than the air entering the carburetor. So during cold weather, the second choke pull-off has no effect. But during warm weather, the air entering the carburetor is already warm. This causes the thermal vacuum valve to open, passing vacuum to the second choke pull-off which pulls the choke open sooner than it would open otherwise. A vacuum delay valve is often used in the secondary choke pull-off vacuum line to delay full choke opening for 8 to 20 seconds (to give the engine a little more time to warm up).

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(1) Loosen the choke cable at the cable control bracket but do not remove it. (2) Pull cable knob or lever all the way to closed position. (3) Manually close the choke baffle all the way. (4) Tighten the choke cable at the cable control bracket. (5) Ensure choke opens and closes properly by pushing and/or pulling the cable knob or lever.

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I would use either a modified,or improved cylinder,choke for close in small bird hunting.

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Yes. If the choke plate is sitting in there loose if can close by itself which would flood the engine. Also, without the choke you would have a very lean condition during cold start-up until the engine warms up.

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Most of the chokes on this type carb are basic spring loaded designs and are really meant to insure at pull start speed the system draws enough fuel to start.

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car wont run its like a carb if the choke is close the car cant breath

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It sounds like your choke is stuck closed. If you clean the linkages for the choke and open and close it by hand a few times it may start working again. I used to have a clothes pin for my old dodge truck for when the choke stuck closed. If you put a clothes pin on the choke plate it cant close all the way... Viola! Until the engine is cold, anyway. ;-)

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The springs on a Q-jet are used to close the carburetor when you let off the throttle. Look at the throttle and install the springs to pull the throttle closed. Most Q-jet brackets have holes for the springs to attach.

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i had the same problem and it was just that the idle screw needed to be adjusted. its on the right side of the bike and its a little knob that you can turn with your fingers. Start the bike with the choke on and let it warm all the way up and then adjust the knob clockwise to make it idle faster until you can close the choke all the way

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The automatic choke isn't engaging, the throttle body should almost close down completely when it is cold out.

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"Choke" refers to the amount that the barrel is constricted at the muzzle (located at the end of the shotgun barrel). The more constricted the bore opening is, the narrower and denser the pattern of shot which can be thrown. Several degrees of choke are commonly available, including full, improved-modified, modified, improved-cylinder and cylinder bore. Full choke barrels are made for long range shooting because they make the shot pattern denser at greater distances. Improved modified chokes fall between the full choke and the modified choke and are sometimes used in trapshooting. Modified chokes are midway between the full choke and the improved cylinder choke. Improved cylinder and cylinder bore or skeet chokes have little constriction and give the greatest spread (most open pattern) when shot is fired at close range. A slug may be fired through a choke so long as the slug can fit. If the choke is to small at best the choke threads will strip and at worst the barrel will split down the middle killing or maiming you. When in doubt ask the dealer.


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