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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

1990 3f landcruiser aisan carburetor

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  • Joshua Hill Jan 06, 2013

    It will only run above 1000rpm as soon as it drops below this it dies.


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  • Cars & Trucks Master
  • 40,820 Answers

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.

Posted on Jan 06, 2013

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Posted on Jan 02, 2017

  • 22095 Answers

SOURCE: carb mixture screw ineffective

flexable pipe from manifold to fixed pipe for the brake servo its porous and sucking in air

Posted on Jan 10, 2009

  • 6674 Answers

SOURCE: I don't know where the air/fuel mixture screw is on my carb

There should be one screw (I'm assuming it's the Carter YF carburetor 1 barrel) that's by itself away from linkages etc, more to center at base of carb where it meets manifold, that is angled approx 45 degrees going in to base. That should be your mixture screw. What symptoms are you experiencing anyway?

Posted on Apr 04, 2009

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SOURCE: The carburetor is running too rich and fouling the

Afew things to check first before you start playing with it is to take out the air filter if dirty replace it ,Chrck the exhaust and see if its carboned up if so burn it over a fire and then tap it to remove all black carbon Then check the carby again as all carbys have a mixture screw and a air vent screw and check the compression to make sure the plug is caused by
richness and not oil.
Also check the engine breather pipe as a blocked pipe can cause the same thing.
Let me know how you get on Ron

Posted on Nov 04, 2009

  • 2002 Answers

SOURCE: 350 chevy with elebrook carb will not idle below

Manually operate the choke mechanism and watch to make sure it fully releases. Quite often mistakes can occur when putting the pieces back together and it won't fully release off fast idle.Are you absolutely positive that you didn't forget an o- ring or ball when you put the carb back together? Is there any chance there is a gasket upside down? Could the power valve be in wrong? These types of things could create that problem, there is too much gas going through your idle circuit.What happens when you turn in the idle screws? Are you sure about the timing? I don't have specs for a 1/2 ton but all the specs in my Chilton give me 6 degrees in California and 8 degrees everywhere else. These numbers cover all models of cars for a 1978 350. Hope this helps.

Posted on Oct 24, 2010

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1 Answer

Idle set 750 double pumper

thee should be 4 sets of mixture screws on the carby
turn them all in till stop and then screw each one out 2 full turns
you may have use a bit of throttle to keep it idling but it is idles the screw one mixture screw in until the engine prms goes down turn it back out slowly until the engine again starts to die
count the screw turns and turn it back in 1/2 that number of turns
do that for all the mixture screws
have you set the float level correctly
iare there any vacuum leaks

Sep 19, 2015 | 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

1 Answer

What is the problem if carburetor idles high even when valves (mixture, idle) are at low adjustment?

are you allowing the car to warm up first before checking your adjustment screws? have you also checked the timing of your vehicle?

Jul 28, 2014 | 1990 Toyota Corolla

1 Answer

Help me

Hi John, I suggest first carrying out a compression test. As you'll know a difference of readings between combustion chambers can result in misfire and loss of power. It would seem to me that if pressure is building in the cooling system there is something wrong with the head or head gasket. Did you have crack detection carried out? When removing the head I'm guessing you checked for ridge wear in the cylinder bores, so we won't go in that direction. I'm also guessing that the head was skimmed and is not warped? I guess you have used the correct torque setting when refitting the head? If not, as you'll know a leakage between the cylinder head and subassembly can result in combustion leaking into the water jackets, causing pressurization of the cooling system. Did you use genuine replacements when replacing the points and condenser? Make sure the new plug cables are all in good condition. These days we're getting plenty of dud replacement parts inclusive of condenser's and contact breakers! I suggest you carry out a resistance inspection. The ignition timing is as you know, also critical. Did you carry out a strobe setting of the ignition timing or static? I suggest a strobe. Open the peep hole cover on the bell housing and mark the timing at eight degrees BTDC on the flywheel and put a spot of paint on the pointer and reset timing with the engine idling at seven hundred and fifty RPM. Once timing is set, adjust the mixture control screw on the valve body of the carburetor, turning it inwards very slowly. If the engine begins to slow and become "lumpy," turn the screw outwards until the engine speeds up and runs as smoothly and as fast as possible. If the RPM increases too much, reduce by using the idle adjustment screw mounted on the linkages of the throttle butterfly mechanism. An incorrectly set float can also result in flooding and poor fuel consumption. Let me know how you get on. Regards John

Jul 21, 2013 | Cars & Trucks

1 Answer


Before you could adjust the mixture, make sure that the spark plug gaps, ignition timing and valve clearance are all OK.
- Start the engine and bring it at operating temperature.
- Adjust the throttle stop screw to bring it at the stable rpm.
- Turn in the idle mixture screw while observing the engine speed till the engine starts to stall. At this point turn out the idle mixture screw and keep on opening slowly till the engine acquire the most stable rpm. Finally adjust the throttle stop screw to obtain the desired idle speed.

Jul 12, 2013 | 1990 Toyota Land Cruiser

1 Answer

Low idle

Possible causes are clogged idle jet/fuel circuit in your carb.

Idle mixture too rich or too lean

Idle speed set too low.

Apr 05, 2010 | 1990 Toyota Corolla

1 Answer

1990 geo metro engine surges up and down when stopped..... prevous owner told me he turned the idle down. So, is the surging a direct result of idle adjustment or something else? ...and where is the idle...

hi sounds like your engine is surging due to incorrect mixture now your idle screw is on the thottle cable were it connects to the carb and the mixture screw is on the carb body as an approx guide turn the mixture screw fully in then out two and a half turns that should help but y may need to fine ajust later

Nov 15, 2009 | 1990 Geo Metro

1 Answer

1985 Toyota Pickup -- Idles Too Fast

Sounds like both need the chocks ajusted or there sticking.

Feb 08, 2009 | 1990 Toyota Corolla

2 Answers

1988 F-250 460 engine stalls when dribing down the road

On older, carbureted engines, cold stalling (and hard starting) is most often due to an automatic choke that is sticking, misadjusted or broken. Cleaning the choke mechanism with aerosol carburetor cleaner may free up the choke allowing it to work properly again. If the choke housing as an electrical heating element, the element may not be receiving voltage when the key is on, or the element may have burned out (check resistance with an ohmmeter).

Other causes of stalling with a carburetor include an idle speed adjustment screw that is set too low (turn screw to increase idle speed rpm). The engine may stall if the idle fuel mixture screw(s) are not adjusted correctly or the idle mixture port(s) are dirty or clogged with fuel varnish deposits (clean the carburetor and readjust the idle mixture screws for smoothest idle). Stalling can also occur is there are vacuum leaks in the carburetor, under the carburetor (bad base gasket), or any vacuum hose connections to the carburetor or intake manifold

Jun 22, 2008 | 1988 Ford F 250

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