Question about 1993 Honda Accord

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On the carb'd Honda 1.8 (F18A) engine, which lower adjustment screw does what?

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Possible ur idleing turn ur car on then slowely turn it

Posted on Jul 28, 2009

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Posted on Jan 02, 2017

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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

I have a 1985 gmc Sierra with an 305 with an edelbrock 1401 500cfm carb how should I adjust the carb to run stronger with the 2 screws on the front of the carb


Start by checking the existing settings of your air adjusting screws (the two in front). you do that by turning the screws one at a time in (clock wise) at one half turn at a time until they stop. should be appx. 1 1/2 turns. Be sure to jot down how many turns it took so you can put them back if need be. Now set both at 1 1/2 turns out (counter clock wise) NOTE. Do all this with engine off...... Now start engine and turn screws out slowly one at a time about 1/2 turn then in until you hear the engines RPMs start to drop then turn out again 1/4 turn. Now your air/fuel mixture should be as close as your going to get it without a dino machine

Jan 03, 2013 | Cars & Trucks

3 Answers

Idle goes from 1000 rpm to 1800 rpm shortly after cold or warm start. Replaced the idle air control, no fix there. There is no bleed valve for the cooling system.


For the engine RPM problem, you probably have a vacuum leak (cracked hose, bad PCV valve, intake plenum or manifold gasket, leaking brake vacuum booster, etc.).

Some Honda engines are not equipped with bleed valves for the cooling system. If you would like to know if yours was originally equipped with one and where it is located, you will need to say which engine your Honda is equipped with.

Aug 30, 2011 | 1998 Honda Accord

1 Answer

Need to know how to properly set mixture of fuel and air on my carburetor


Would be nice to have the year and engine size to verify you actually have a carb and not injection, but, to adjust most carbs, disconnect and plug the vacuum hose to the distributor, attach a vacuum gauge to the manifold, and a tach to the coil. Lower the idle by adjusting the throttle linkage, to the lowest rpm the engine will run at.
Turn one of the small adjustment screws in the front of the carb base 'till you have the highest rpm and vacuum (usually not the same....go for best compromise) Then, do the same using the other screw.
Repeat again at the first screw and so on 'till they are balanced. Generally it's best to then back off both screws about a quarter turn after you have finished, but sometimes that isn't necessary.
Once that adjustment has been made, re-adjust the throttle screw to the correct RPM and re-connect the vacuum line to the distributor.
One note...wait a moment after each adjustment so the engine vacuum stabilizes.
Some carbs will have the adjustment screws "capped" If you find that, you will need to remove the carb and carefully drill them out without damaging the screw head under the caps.

Jan 13, 2011 | Dodge D150 Cars & Trucks

1 Answer

What kind of carb does the 76 c10 4x4 come with need to adjust


mcdevito75 here, The fast idle is needed when the engine is cold to make the air and fuel mixture rich to keep the engine running while cold, the carb. choke doew this with a bi-metalic spring in that balck round box on the side of the carb, a screw also hepls keep the choke closed until warm up, this screw can be adjusted tpo control how tight it holds the choke cloesed, here"s how to adjust this screw to slow fast idle speed, Locate on the carb, where the gas pedal connects, have a friend operate the gas pedal with the engine off, once you locate the linkage, you"ll also see 2 screws with springs around them, 1 is for fast idle the other for regular idle, you want the fast idle screw, notice this screw will lay against and Half moon shaped tab, while the other screw lays against a shaft, you need the screw that lays against the half moon shaped tab. Start the engine and step on the gas pedal slightly and relaease, at the screw that lays against this half moon, simply turn it counter clockwise or toward you just 1 2 or 3 turns very slowly, you'll hear the fast idle come down but you don"t want the fast idle to low, listen to the engine very carefully, slow it down just a bit, it should still race though but not out of control. Of course for a full carb, adjustment the shop should handle that., but this info will help.

Mar 29, 2010 | 1978 Chevrolet C1500

1 Answer

How to adjust the carborator on a cs30 Trimmer will not keep running unless full throtal


check make sure air filter is clean. solution #1.
Odds are the carb is dirty inside, if it is you wont be able to adjust it.
Most older engines have 2 adjusting screws one is marked with a letter H for max RPM and the other is marked with the letter L for Idle or low RPM
try adjusting the screw with the letter L, this is the low speed screw which is regulates the idle. while the engine is running screw it in 1/8 of a turn at the first adjustment and see if that helps if it gets better keeping adjusting it in until it reaches the normal idle, if you screw it in to much it wont take the fuel when you try to accelerate the engine. If this does not work adjust it the other direction. Newer engines have only one adjusting screw which makes it simpler. If it can't be adjusted out to where it runs suitable you will need to disassemble the carb and replace the screen strainer and possibly the diaphram. Check make sure the fuel line inside the tank broken away from the fuel filter as this will cause the carb to get trash in it. In that case you may need a new fuel line if it has deteratiated too much.

Nov 22, 2009 | Cars & Trucks

2 Answers

Just installed new carb in my 1989 honda. Used diagram to connect vacuum hoses back up, but car idle speed is too high - up to 2,000rpm. What could be wrong?


try turning down the idle via the idle adjust set screw (usually on the carburetor base). if the problem persists after the engine is warmed up, there may be an issue with the automatic choke. also check the throttle linkage by disconnecting it to see if it is holding the throttle open when connected. if this is the case, you may need to adjust it or find a slightly longer cable.

Oct 04, 2009 | 1989 Honda Accord 4 Door

1 Answer

1993 Ford Ranger 3.0L V6 starts surging @ 33-34 mph and @ 1200 rpm. Tried to duplicate @ different speeds and rpm combanation but only does it @ these. Changed spark plugs, wires, cap, fuel filter and oil...


Hello:;
This sounds like a fuel problem at the carb. What it's doing is termened hunting a nd can generally be corrected by a simple adjustment of the carb. Engine at idle and neutral set rpms at lowest idle , around 640 rpms. then adjust the a/f ratio screws to balance carb. Screw both screws all the way in, do not force ,or needle and sear damage will occir. Now back each out to 1.5 turns That is your start point Adjust one screw in and out slowly until you you feel its best effact on ide whicjh should slightly increase. repeat with other screw, in and out slowly . listening to the engine idle. if idle has increase due to your adjustmebt, repwat process after lowering the idle speed again with the idle screw. When you get to the point the screws no longer affect the idle the engine show sound and run smoothly at idle, make sure you resert the idle to 650rpms for an automatic trans and 650-750 for manual trans. I hoped this helped- good luck.. If it still does it, the carb may nrrd the float checked and st.

May 15, 2009 | 1993 Ford Ranger SuperCab

1 Answer

1989 accord lx, idles high at start-up, now it won't stay running


Carburated engines of that year may have an idle screw adjuster. You can see the screw from the outside of the carb. If so, try adjusting the carburator with a screwdriver. Unlike fuel injected Engines they can be manually adjusted.

Apr 08, 2009 | 1991 Honda Accord

2 Answers

22R Carb at high altitude


Yes, Colorado is much higher in altitude. Do to higher altitude the barometric pressure is less than sea level by a long shot. Lower barometric pressure mean that less air is entering your engine. Which in turns mean that your engine is now running richer than it was at a a lower altitude. So I recommend checking you engine timing, and adjusting your carbs air/fuel mixture. yes this means that you may need to rejet. but first there is a screw on your 22r's carb that you must adjust to lean the air mixture just right. I have had a stock 22r carbortor before and never had to rejet it. i probibly should have but it ran fine at sea level and all the way to about 10000 ft. after 10000 feet i had to lean the fuel mixture to even alow the engine to run. This screw that you must turn is hidden due to toyota not wanting you to tamper with it and burn your engine to the ground by running your engine to lean. it has a metal plug on the passenger side of the carb about the size of a pencil eraser. you must drill that out and then you can adjust the air fuel mixture. Clock wise is to lean the air fuel. and Counter clock wise is to richen the air fuel mixture.A good rule of thumb is to turn the air/fuel screw all the way clock wise and then back out about 2 and 1/2 turns. That is the factory adjustment. you may only need 2 turns out. Best of luck i hope you get it running perfect. Try this adjustment first then if it still runs rich then think about rejetting.

Here is a picture of what i am talking about.

#1 is the air/fuel mixture, #2 and #3 are cold and warm idle screws.
#4 is a A/c idle adjustment.

5ff308f.jpg

Sep 04, 2008 | 1987 Toyota Pickup

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