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My carburetor cant stay on idle for long time

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  • bob c May 21, 2011

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Try cleaning the throttle body with carb spray

Posted on May 21, 2011

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How do you adjust idle speed 1991 johnson 100 hp


not important, what's important is that they are absolutely clean, including the four brass high speed jets located in the bottom center portion of the carburetor.

That model engine's carburetors has fixed jets, BUT if the slow speed jets are adjustable, earlier model carburetors have been installed. If so...................

The four adjustable needle valves control the flow of fuel in relation to the set air flow, adjusted as follows (if needed).

(Dual Carb V/4 With 4 (2 each carb) Slow Speed Adjustable N/Valves)
(J. Reeves)

The adjustment procedure of the carburetor slow speed needle valves follows. NOTE... if the needle valves turn too freely, replace the nylon bearing retainer (the nylon item at the front of the carb that the needle valve goes through first) with the newer type RED retainer #315232. If your engine has that weird linkage that connects all four of those needle valves, the newer RED retainers will enable you to discard that linkage. The RED retainers make it impossible for the needle valves to vibrate out of adjustment.

(Carburetor Adjustment - 2 Slow Speed Adjustable Needle Valves, each carburetor)

Initial setting is: All (4) Slow speed valves = seat gently, then open 1-1/2 turns.

Facing the carburetors, start with the top left needle valve, then the top right valve, then the bottom let valve, then the bottom right valve. It may be necessary to redo these steps to get the adjustments ideally set

Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running.

Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.

Do not attempt to gradually adjust all four of the valves at the same time. Do one at a time until you hit the above response (die out or spit back), then go on to the next valve.

When you have finished the above adjustment, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.

Jun 28, 2017 | Cars & Trucks

1 Answer

Carburetor diagrams deni pd24jh


Did you adjust the idle mixture screws ? Is this a two or four barrel carburetor and what make carb. Carter , Holley, Quadrajet etc.. What make vehicle is it ? Normally the idle mixture screws should be opened 1 and a half turns to two turns . counterclockwise from fully seated . Then you can set the idle screw to what the idle should be 600 rpm to 750 in drive . Most cars have a decal somewhere under the hood telling all these things !

Aug 14, 2014 | Cars & Trucks

2 Answers

Craftsman gas pressure model#580-752220 willnot stay running. Only after you push the primer 10-20 times it will start &run for 5-10sec..It will run if you pour gas in carburetor.If you quit with the...


Sounds like the idle jet in the carb is plugged up.

It only stays running from the primer load, then dies when that is used up, as the gas can not get from the float bowl through the idle jet.

Did you store it for a while with the gas still in it?

If so, what happens is the gas starts to go bad, and over time it can get almost like a varnish.

When this happens, it starts plugging up the small ports in the carb, starting with the smallest, which is the idle jet.

Before storing for any length of time, your best bet is to drain the gas and run the float bowl dry.
If not that, at least add some fuel stabilizer to the gas left in it, and run it for about 5 minutes with the stabilizer in the fuel.

May 31, 2014 | Cars & Trucks

1 Answer

I have a 1990 landcruiser with a 3f engine, i just replaced the carburetor and set idle mixture screw to 2 and 1/2 turnsout as the book says but i cant get it to idle at all. Standard aisan carb. Any


check that the idle solenoid shut off needle is connected . It is used to stop engine run when the ignition is turned off. If it is not connected the idle circuit of the carby will not function and the engine stops.

Jan 06, 2013 | Cars & Trucks

1 Answer

Pulled off fuel line to carburetor and it is pumping plenty of gas on 1987 Jeep Comanche, what next?


idle speed control not working. if idle speed too low engine wont stay running.

Nov 04, 2012 | 1987 Jeep Comanche

1 Answer

My 1988 chevy sprint runs rough when i start it then idles at about 2000 rpm after several minutes and stays at that high idle. i have tried to fix it several times with arebuilt carburetor new plugs cap...


i have the same car and mine does the same thing i think its a common problem for the car does yours stall out after roughly 15 minutes after just sitting at idle ?

Nov 04, 2010 | 1988 Chevrolet Sprint

1 Answer

Truck will not stay idled without keeping your foot on the gas


check the idle control solenoid on the side of the carburetor. have someone turn the key on and then off a couple of times and see if you can hear it clicking. if not check your fuses and see if one is blown. if they are fine you probably have a bad solenoid.

Aug 20, 2010 | 1987 Nissan Pickup

1 Answer

My 1984 toyota corolla ran out of gas now it wont idle


Quick explanation of your fuel system:

An automotive fuel system consists of everything between the fuel tank and the carburetor or fuel injection unit. This includes the tank itself, all the lines, one or more fuel filters, a fuel pump (mechanical, electric, or both), and the carburetor or fuel injection unit.
With the exception of the carburetor or fuel injection unit, the fuel system is quite simple in operation. Fuel is drawn or pumped from the tank through the fuel line by the fuel pump, which forces it through the fuel filter, and from there to the carburetor/injection unit where it is distributed to the cylinders.

So with that info...try first to clean your spark plugs.
Next, replace your fuel filter.
After that, depending on a carburetor/fuel injection, try an additive that cleans the injectors. For the carburetor, try a half of can of what is called "Seafoam". It comes in a metal can available everywhere, including Walmart. It is worth the $6-8 and also will "dry" out your fuel from water. Very good product.

After that, get back to us and let us know how your Toyota is running.

Oct 12, 2009 | 1984 Toyota Corolla

1 Answer

Carburetor problems 1989 honda accord lx


Carburetor on a 2002??? Do you mean throttle body? If you changed the throttle body to a different brand or size then your car's cpu should be reprogrammed.

Oct 18, 2008 | 2002 Honda Accord

1 Answer

Sometimes cant idle


i will recomend you to clean the carburetor with carburetor cleaner, just buy some at auto parts remove the hose on top on carburetor and keep the rpm arrownd 2500 and keep ading the cleaner to the inside of carburetor, if you add too much it might backfire just keep you face away from the carburetor good luck and let me know

May 22, 2008 | 1985 Volkswagen Jetta

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