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1989 jeep wrangler 4.2 6cyl 2bbl carter is there a base seting on the air/fuel mixture screws

Rebuilt carter nd2904 carb i don't think that the adj.screws for air fuel are corect is there a base setting to start at?

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6ya6ya
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Posted on Jan 02, 2017

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motor1258
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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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wracefans24
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SOURCE: i have a 2004 jeep wrangler that wont accept fuel

there are two valves on top your fuel tank,
one is a roll over valve that will close off the fuel if the vehicle rolls over,the other is a vent valve that lets pressure escape while your filling it with gas,this valve is not letting the air that is going in the tank with the fuel vent out ,so it is coming out the only hole it has which is the filler tube.

Posted on Dec 28, 2009

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SOURCE: 1989 jeep wrangler starts jumping and backfiring

Start with the basics...meaning check the spark plug wires and spark plugs. While under the hood, inspect all hoses for a vacuum leak(s). Then turn the ignition key on-off-on-off- on...leave in the on position and write down the number of flashes the check engine light indicates....2 flashes = #2....pause.....3 flashes = #3.
Let start from here. Are you able to perform engine repairs or diagnostics???

Posted on Jan 17, 2010

thunderz
  • 232 Answers

SOURCE: i require the base settings

Center screw turn all the way in than back out one full turn and a half,,the idle I play by ear untill it sounds good. Or you can Google ( How to tune the idle and mixture screws on a 18R toyota motor)

Posted on Mar 07, 2011

witmoz
  • 389 Answers

SOURCE: My 1989 Jeep Wrangler stalls while driving. Have

check the egr and the vacume lines to it,also check the cps(crank position sensor)and the connector

Posted on Apr 15, 2011

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1 Answer

How to adjust the fuel and air mixture on a 1982 ford 4.9 six cylinder, carter carburetor.


There should only be 1 screw located at the base of the carb facing outward.

The method I use requires a tachometer. If you don't have a tachometer then you can use the "by ear" method, though it's not as accurate.

With the engine off, start by turning the screw all the way in, then back it out 1 and 1/2 turns. This usually give you a baseline to start with.

Start the engine and get it up to operating temperature, make sure the choke is fully open, and have the air cleaner and all vacuum lines installed.

Using the tachometer (or ear) turn the screw (usually out) until the RPMs increase. If they don't increase by turning the screw out, then try turning it in.

Eventually the RPMs will stop climbing while turning the screw (as said earlier, usually out).

THEN turn the screw the opposite direction (usually in) until the RPMs JUST start to drop off. That should be real close to the optimum setting.

This setting is ONLY for the base idle air/fuel mixture and is NOT for anything else.

Hope this helps.

Feb 16, 2015 | 1982 Ford F 150

1 Answer

I would like to know if you have a carter carburator diagram for a 2bbl carb


Www.carter.com ask for exploded views of your carb you'll need the tag number on the carb. Its relatively easy to do as long as your float level is correct or google carter carberators using the tag number

Feb 06, 2015 | Cars & Trucks

1 Answer

Just rebuilt the engine and carb and can't seem to find the right adjustment to keep it off high idle


sure its not running on autochoke ,sounds like it to but if you have done a nice job on the engine then you may need to adjust the mixture on idle which for the inspection must be less than 2% it will idle well if this higher as its burning more fuel on idle but this is not allowed for the test ,once it leaves the test station ? This has one of them fish type carbs and havent done one for many a year but the mixture idle is on the base of the carb and they normally have a spring on the screw shank to hold them

Mar 25, 2012 | 1990 Mazda B-Series

1 Answer

What should the idle speed be set at on a 1989 jeep wrangler 4.2 liter straight 6 cyl. It has a 2bbl carb. It idles at 1000 rpm right now but seems fast or is that about right?


Most carb. engines should idle between 725 and 750 R.P.M., lower the idle and be sure to check the timing. You should have an emissions label under the hood to explain the idle and timing.

Aug 16, 2011 | 1989 Jeep Wrangler

1 Answer

How do you adjust air fuel mixture


If it's injected you can't do that. It is controlled by the computer via sensors. If it is carbureted, there should be an adjusting screw in the base of the carb but it may be covered by a plug in which case you need to remove the carb from the manifold and drill out the plug (carefully) I generally drill from one side edge and use the hole to pry the plug out. "baseline" setting is about 2 1/2 turns back from fully in....don't tighten it hard to start or you will damage the end of the screw and the seat. Best way to adjust is by attaching a vacuum gauge and turning screw 'till you obtain the highest vacuum reading, then making small adjustments to get any roughness out of the idle. Only adjust with a fully warmed up engine.

Jan 28, 2010 | 1987 Jeep Wrangler

1 Answer

89 Jeep Wrangler. Engine stalls only when I put into gear.


it might be getting to much fuel check the fuel screw

Jun 10, 2009 | 1989 Jeep Wrangler

3 Answers

1990 Jeep Wrangler: Dies out at low RPM's, at stoplights,backfire


I had a very similar problem with a 1990 Wrangler with the 4.2L six - Carter carburetor. Another website suggested checking the idle tubes in the carburetor that turned out to be my problem. One indication is that if the curb idle is set way up to keep the engine from dieing, adjusting the idle screw does nothing (no idle fuel is being supplied). To clean the tubes, it is possible to remove the top or air horn component of the carburetor without removing the carb from the engine. Some linkages have to be removed and some hoses disconnected. It is a little tricky but can be done. A book such as Chilton's is good for some guidance. The venturi cluster can then be removed from the main body (still on the engine) by removing a couple of screws. The two tubes hanging down from the venturi cluster are the idle fuel pick-up tubes. I could see these to be clogged at their lower end. There was also a lot of gunk at the bottom of the wells they draw from. I cleaned the tubes with some fine wire, compressed air and solvent. I also cleaned inside the wells as best that I could. Getting the air horn back on is a little tricky - mainly getting the metering rods reset into the metering jets (the two brass rods that hang down from the air horn body. This is facilitated by removing the bowl vent cover and manipulating the tops of the brass rods until they drop into the metering holes. Another option is just to get a carb overhaul kit and remove the whole carb and rebuild it according to instructions. I will probably do this eventually but have fixed it for now.

May 28, 2009 | 1990 Jeep Wrangler

1 Answer

Jeep cj won't idle


Assuming that the jeep has not been modified it is likely the Carter BBD Carburetor on that engine, or the sensor inputs to the carburetor.

The Carter BBD has an idling circuit that is always seeking. There is a stepper motor that keeps changing the rpm, and fuel mixture. It basically never stabilizes, and it keeps adjusting based on the feedback loop from half a dozen or so sensors.

So, if a sensor goes bad and feeds a constant signal to the carb, you get problems.

The Carter BBD is a very difficult carb to rebuild and is usually fairly dear in terms of cost.

If you can find a Jeep factory repair manual (on ebay) on the 85 cj -- it is an olive green manual about 3 inches thick and is usually not too expensive, it has troubleshooting procedures for the BBD. Don't get a Haines or aftermarket manual. get the olive drab official factory manual

Remember it is probably the carb that is bad, but there may be more to it than just that.. I don't remember all the inputs to the stepper motor circuit, but I do know that EGR valve is one of them.

good luck

May 16, 2009 | 1996 Jeep Grand Cherokee

1 Answer

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?

Apr 03, 2009 | 1984 Ford F 150

3 Answers

Troubleshooting fuel system for 1975 jeep cj5


Fuel pumps just supply fuel to the carb. Either they work or don't work. I would make sure that the mixture screws on the carb are set properly. Turn the screws in to lean out the mixture, do one at a time.
You want to turn the screws in to the point where the jeep will start to idle rough and then back out a 1/2 turn. Check your timing also. If the jeep has alot of miles on it, the timing chain will stretch and it's possible that you cannot get the correct timing.

Dec 30, 2008 | 1983 Jeep CJ5

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