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Proper air fuel mixture screw setting - 1999 Volkswagen Passat

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Car smokes but it has power


It sounds like the engine is running "rich". This means that the air-fuel mixture if off, and there is too-little air getting to the engine for the amount of fuel. Try replacing the air filter.

If your engine has a carburetor, the problem might be the choke or the mixture screws. Unless you are familiar with you carburetor and the settings for your engine take your car to a mechanic and have it set properly.

If your vehicle if fuel-injected, take it to a parts store that will run the engine diagnostic check. If the problem.id the engine, the diagnostics will reveal the problem.

Feb 23, 2015 | Cars & Trucks

3 Answers

When i come to a stop sign or a red light the truck just shuts off


iac valve idle air control valve if it not easy to start or hard to start if you hold the gas pedal a bit it doesnt stall check the idle air control thanks pierre let me now

Oct 04, 2008 | Chevrolet 1500 Cars & Trucks

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

2 Answers

How do I adjust air fuel mixture on 1986 Toyota Cressida straight 6 cylinder dohc


Unless your engine has a carburetor, you can't adjust your fuel mixture. That is done by your cars computer. It analyzes your exhaust emissions and adjusts your fuel/air ratio.
Your oxygen sensor(s) may need to be replaced, or there may be a computer glitch causing the problem.

Feb 02, 2015 | 1986 Toyota Cressida

1 Answer

Proper carburater air/fuel adjustment/settings for 1 barrel chevy 250/4.1


The generic setting is 1 1/2 or 2 turns out to start with.

Sep 02, 2012 | Cars & Trucks

2 Answers

95 nissan sentra 1.6L, air fuel mixture adjustment. If adjustment screw is turned completely in how many turns out to proper setting?


1.5 turns for most carbs, but you can use a vacuum gage on the intake to get it right. Make sure engine is warm and on the regular idle screw, then turn the mixture screw in and then turn out until vacuum stops rising. OK?

Oct 20, 2010 | 1995 Nissan Sentra

1 Answer

Hello I have a 1980 Ford Bronco 351 2bbl. Wondering if anyone knows which screws adjust what? Please if anyone has any ideas please respond. Thank you.


Here are some images that might help to assist you, and let me know if you require any further assistance.


Adjust the curb idle with the engine warmed up and the choke off.

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The air/fuel mixture screws should be adjusted with the engine warmed up and at normal idle speed, then turn each air/fuel mixture screw in one at a time until the engine just begins to mis-fire, then back the air/fuel mixture screw out 1-1/2 to 2 turns out a half a turn at a time until the engine idle is the smoothest. (your vehicle might have restrictor caps over the air/fuel mixture screws to limit the amount of adjustment)

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The choke adjustments;

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To adjust the vacuum tension pull on the choke pull-off:

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Adjust the fast idle screw to the proper RPM with the engine cold and the choke on.

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Jul 31, 2010 | 1981 Ford Bronco

1 Answer

How do i get more power from my 1975 cadillac eldorado engine ,also shes running too lean so need the mixture screws adjusting,are these in or out also the air filter is new thanks


The air/fuel mixture screws are usually capped off and the adjustment might not be possible, but if the air/fuel mixture screws are exposed then turning them in will lean out the fuel mixture, and turning the air/fuel mixture screws out will en-rich the fuel mixture.

With the engine fully warmed up and at normal idle speed adjust the air/fuel mixture screws one at a time, and turn each air/fuel mixture screw in until the engine just begins to mis-fire, then back out the air/fuel mixture screw one and a half turns to two turns to achieve a smooth idle.

Be certain that the air and fuel filter(s) are not plugged up (there might be a fuel filter inside of the fuel pump as well as the fuel filter/stone at the fuel inlet to the carburetor) and keep in mind that the minimum octane requirement for that engine is 91 octane, and 92 octane is the average octane rating for the premium higher grade fuel, so a bottle of octane booster added to a full tank of fuel will greatly improve the way the engine idles and performs.

That engine should have an electronic HEI (High Energy Ignition) distributor with the large distributor cap and with the ignition coil inside of the top of the distributor cap, and keep the tune-up parts in good condition and replace them when they wear out. The tune parts would consist of the distributor cap, ignition rotor, spark plugs, spark plug wires, and the spark plugs should be gapped at .045 in.

For better performance from your El Dorado a 1 inch spacer under the carburetor will really help a lot if the hood clearance will allow it, and you will need to set the ignition timing to 10 degrees before top dead center, and adjust the accelerator pump on the carburetor for maximun pump efficiency so that as soon as the throttle is opened there is two healthy squirts of fuel from the accelerator pump, and they should squirt as soon as the throttle is opened, and if the throttle can be opened and the accelerator pump does not squirt fuel at the same time as the throttle is opened, then there will be a lag or stumble from the engine on take-off and a severe loss of engine performance. (The accelerator pump must pump fuel into the carburetor at the exact same time as the throttle is opened)

For better performance check the adjustment of the secondary throttle linkage, and let me know if you require assistance with any of the proceedures.

Be sure that the vacuum lines to the EGR valve are correctly routed and that the EGR valve is not operating at idle.

Also, that engine has a plastic timing gear that was used for the camshft timing gear, and I would seriously suggest that it is changed before trying to get any performance from that engine.

Other than those modifications, the engine would need a better camshaft and the catalytic converter removed to increase the performance of that engine.

Here are some images to help assist you.


Fuel Pump Filter:

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Rochester Carburetor Secondary Adjustment:

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Jul 10, 2010 | 1976 Cadillac Eldorado

2 Answers

How to adjust air fuel mixture on a 87 suzuki samuria


On any carburator,one screw is for the idle speed, the other the air/fuel mix.Start the engine and let it get plenty warmed up. Adjust the idle screw to make the engine run slow. Turn the air/fuel screw in until the engine starts to die then out till it starts running loady.You want the screw between these two locations. Adjust it till the engine runs the fastest. Now adjust the idle speed screw to about 1000 RPM.
I hope this helps you.

Sep 24, 2009 | 1993 Suzuki Samurai

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

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