Question about 1990 Mitsubishi Minivan

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Fuel mixture setting

Gday is there an set position for the mixture adjustment screw?what is the best way set it and what is the best way of cleaning out the carby without removing it from inlet manifold?i am an exhaust fitter by trade but this is not my scene so any help would be greatly appreciated thank you

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Adjust the fuel mixture to the position where you get the highest rpm at idle...You can ues a tach for this , but if you don't have one, you can do it by ear
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Posted on Sep 18, 2008


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Which screw is feul setting screw and which is air setting one screw adjesting with spring which is that?

You have me concerned because you didn't even say carburetor...

So I am going to assume it...
and what make of vehicle (year?)... let alone the make or style of your "fuel" screws...

but to answer your question it really is unimportant.

Air-screw is always associated with the throttle shaft... the adjusting of the primary screw rotates the position of the plates on the throttle shaft exactly the same as the gas pedal does.

The fuel screw is usually pointed to the center of the air stack... if it is a two barrel (2 air stacks) there will be two identical screws.

These screws interface with a very soft and delicate orifice... and must be treated with the highest care not to damage that orifice! Never over-tighten those screws!!

Adjusting is an acquired ART... but everybody has to start at the beginning! As long as you are gentle you may soon get the hang of it.

Always set the SPEED with the idle screw first... Then adjust the FUEL with the idle screw...

Gently turning it out to see if the RPMs increase... slowly screw them in (closed) until the motor speed drops ... back it out about a half turn... and again set the AIR screw for the correct RPMs.

You are probably pretty good there but if you want the best/smoothest idle mixture... again repeat the Fuel screw screwing it in... until the speed drops.

Again back it out a half turn and you should be done.

Just always remember that idle screw is last... Change in anything else... especially the timing... points gap... air screw... always finish with the idle adjustment.

Good luck

Nov 15, 2015 | Cars & Trucks

1 Answer

What is the factory setting for the fuel mixture screw on a toyota 1.8 litre 2Y engine

most fuel mixture screws are set initially by turning it all the way in and then backing out 21/2 turns. This should allow start and idle and final adjustment can be done to fine tune it. Check that the idle solenoid is working as it will shut off the idle circuit if it is not

Nov 01, 2014 | Cars & Trucks

1 Answer

Opel kaddet 1995 model. How do I adjust the

There are only two adjustments on a carburetor, the air mixture setting and the butterfly valve position setting. The air mixture screw is on the side close to the mounting flange, and has a spring behind the screw head to keep it in position.
To adjust it, look for the throttle valve screw which is also on the side, it ix the one that attaches close to where the throttle cable attaches to the carb. Turn the set screw down to let the car idle as slowly as possible. Now go to the air mixture screw. Turn it slowly first in one direction until the revs drop, then turn it out to the point where the revs are maximum. You might have to turn the screw back and forth until you find the best position. Now turn the throttle adjustment back to idle speed.

Aug 28, 2014 | Opel Kadett Cars & Trucks

1 Answer

Adjust air fuel mixture

there is a set screw in the front of the throttle body, to adjust it, but first why do you need to adjust it ? if low idle then it could be your TPS or IDLE AIR CONTROL VALVE, this valve is on the back of the TB and should be cleaned first, take the two.screws out which are torx heads and I think.a 25, once you have it out, take TB cleaner and a non lint towel and spray and clean, also clean the port where it sits in to, on these Dodges they are known for these to be carboned up, this would give low or high idle, also check to see if you have your 5volt reference on this sense, the TPS and crank sense, this one is hard to get to, it sits on top of your transmission bell housing on pass side. before you go touching the.idle set screw, check these and clean.idle air control valve first

Dec 04, 2013 | Dodge Dakota Cars & Trucks

1 Answer

Mixture screw adjustment on a ford maverick 1990 how to reset it ?

turn allen 3/32 allen mixture screw for each barrel counterclock wise for leaner fuel mixture if turn mixture screw clockwise richen fuel mixture.

Jul 13, 2013 | Cars & Trucks

1 Answer

1986 dodge ram 225ci slant six and a single barrel holley carb

Start with the idle needle screw first, the idle mixture screw. Seat it all the way in, first-don't overtighten and damage it, just seat it lightly, and back out two full turns. Run the engine and set the adjustment by ear to get your best lean idle: start turning the screw in (clockwise) 1/8 or 1/4 turn at a time till engine stumbles, dies, or runs rough. Keep the engine running, and turn screw out (counterclockwise) a little at a time till you hear the idle dropping. Now between those two settings is your best lean idle. Turn the screw in, a little at a time and wait for engine to respond, tiill you get the highest idle speed. Now set the other idle screw, curb idle, to the idle setting for your truck, probably about 700 rpm. You can move back and forth between the screws to get the best steady idle. Just don't over do it on the idle mixture screw.
Good luck.

May 08, 2012 | Cars & Trucks

2 Answers

I just put on a new rebuilt carburator on my 460 v8 1987 xlt 250 ford truck 4 WH. drive. its a motorcraft stock holley. I cant seem to find a way to ajust it. Wont run smooth or idle? It was set up for...

You have two setting screws on front of carb, You start off by adjusting all the way to the left, Then back off 3/4 turn to both setting screws, Then you have to set your air fuel mixture by just slowly turn your setting clock wise do so until vibration go away. Sorry there is no easy way to explain, Good luck to you,

Apr 03, 2011 | Ford F-250 Cars & Trucks

1 Answer

How do you adjust the carb on a 2.4 engine, 94 nissan pickup

You should have an air mixture and an idlig screw. The air mixture screw is set first untill engine idles evenly. then the idling screw is set untill the idling is as slow, being even, as possible. 800 to 850 RPM should do the trick. Then go back to air screw and FINELY adjust. Try to keep air filter onand make sure it is clean, new and not leaking air.

Jun 09, 2010 | 1994 Nissan Pickup

1 Answer

2002 nissan 2753cc 6cyl firing order.

Carb.basic setting.
On the Carb to Intake manifold there is an AIR/FUEL volume control screw. Gently screw it in Clockwise until it bottoms out, then back it out 2 turns.
Next, find the Throttle Butterfly Fast/ Slow idling screw, and back it out until the Throttle linkage is released.
Then slowly wind it back in 2 turns
If you have SPARK and FUEL up, then it should Fire Up.
When it does, using the Air/Fuel screw to stabilise the idle mixture, adjust the Idling Speed Screw to run balanced at around 750 RPM.
All the best and Regards, DT

Aug 29, 2009 | Nissan Minivan Cars & Trucks

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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