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ZUKIWORLD Discussion Forum => Suzuki 4x4 Forum => Topic started by: zook75939 on July 20, 2008, 08:10:58 AM
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I recently purchased a 1986 Samurai. The only thing done to it was the guy I bought it from installed a 32/36 weber. I am getting about 22 mpg. The Samurai runs and drives great and has good power for a stock samurai. Does the carb need to be adjusted. The guy I bought it from said it might need to be adjusted some. He took the carb off of his offroad rig with headers and cam so that he could put on a harley carb. I don't know much about webers. I try to drive conservative and not hammer on the gas. Any help would be appreciated.
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if you realy want to know try adding something like this, doesn't have to be autometer, but you can tell if your rich or not
http://www.autometer.com/cat_gaugedetail.aspx?gid=2817&sid=15
Ryan
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Thanks for the advice.
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The colour of the spark plugs will tell you if you're running rich or not.
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So yours has the stock cam and exhaust manifold?
If so that's part of your deal. The webber puts a little more fuel in the engine. Without a cam or more air intake it will always be a little more rich than a stock carb.
You should be able to tell if it's rich by the smell of the exhaust.
Another thing is how your distributer advance is hooked up. If I'm not mistaken if you hook up the vac from the distributer to the intake port it will advance quicker and help burn the fuel. But it might be the other way around by hooking the distributer to the carb.
Anyway, check the timing, the o2 sensor and the egr valve cause they all effect the fuel consumption.
You might want to get a cold air intake too (or make your own) that will help quite a bit.
By the way I believe the carb adjustments only apply to idol. In other words the fuel screw does not effect the carb when you are revving or cruising. Don't quote me on that but research it. Good Luck
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So yours has the stock cam and exhaust manifold?
If so that's part of your deal. The webber puts a little more fuel in the engine. Without a cam or more air intake it will always be a little more rich than a stock carb.
You should be able to tell if it's rich by the smell of the exhaust.
Another thing is how your distributer advance is hooked up. If I'm not mistaken if you hook up the vac from the distributer to the intake port it will advance quicker and help burn the fuel. But it might be the other way around by hooking the distributer to the carb.
Anyway, check the timing, the o2 sensor and the egr valve cause they all effect the fuel consumption.
You might want to get a cold air intake too (or make your own) that will help quite a bit.
By the way I believe the carb adjustments only apply to idol. In other words the fuel screw does not effect the carb when you are revving or cruising. Don't quote me on that but research it. Good Luck
If he put a WEBER on it, the O2 sensor is doing nothing but blocking the exhaust.
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So yours has the stock cam and exhaust manifold?
If so that's part of your deal. The webber puts a little more fuel in the engine. Without a cam or more air intake it will always be a little more rich than a stock carb.
You should be able to tell if it's rich by the smell of the exhaust.
Another thing is how your distributer advance is hooked up. If I'm not mistaken if you hook up the vac from the distributer to the intake port it will advance quicker and help burn the fuel. But it might be the other way around by hooking the distributer to the carb.
Anyway, check the timing, the o2 sensor and the egr valve cause they all effect the fuel consumption.
You might want to get a cold air intake too (or make your own) that will help quite a bit.
By the way I believe the carb adjustments only apply to idol. In other words the fuel screw does not effect the carb when you are revving or cruising. Don't quote me on that but research it. Good Luck
If he put a WEBER on it, the O2 sensor is doing nothing but blocking the exhaust.
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Your right, but how does the pcm deal with the signal that used to go to the old carb? Or is it just that, a voltage that needs no response?
And please forgive my extra B
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When you say "PCM" ya talking about the O2 sensor or computer? If you have a Weber on it, the computer is not doing a thing. The O2 sensor sends a voltage to the computer. The richer the mxture the more voltage it sends to the computer. Up to around .8 volts for a rich mixture. That tells the computer to adjust the mixture in the "stock" carb to lean out the mixture. But without the stock carb the computer is doing nothing.
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I was talking about the computer, the computer sends a signal to the mixture control valve on the intake that is not on the carb it is on the intake. So even if you put a WEBER on it if that valve is still hooked up, the computer will still dictate the mixture going into the intake. That's what I was talking about.
Never the less, I was just mentioning simple things to look into to possibly help with his mileage. And you will notice that I suggested he research each of the things I suggested he should check.
I am not an expert by any stretch but I know from experience that it is better to make sure that all your ducks are in a row before you start adjusting the carb and in his case he stated it runs quite well.
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I was talking about the computer, the computer sends a signal to the mixture control valve on the intake that is not on the carb it is on the intake. So even if you put a WEBER on it if that valve is still hooked up, the computer will still dictate the mixture going into the intake. That's what I was talking about.
Never the less, I was just mentioning simple things to look into to possibly help with his mileage. And you will notice that I suggested he research each of the things I suggested he should check.
I am not an expert by any stretch but I know from experience that it is better to make sure that all your ducks are in a row before you start adjusting the carb and in his case he stated it runs quite well.
I hate to tell ya, but on a 1.3 with a carb, there is no mixture control on the manifold. Its all in the carb. Sorry
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That "click" in the carb when you turn the ignition to the "on" position is the mixture control valve.
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I checked the plugs and they look good. Doesn't look like its running rich. now i am putting 215/75/15 tires on it tomorrow. I it has 255/60/15 on it now ( about 1.5 inches wider and 1" shorter) maybe this will help out. Thanks for all your help
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Also my rig has A/C. That probably brings the gas mileage down a little bit.
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My box-stock '87 Samurai got 25 MPG consistently. It doesn't seem like you are too far off that with the modified carb...