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what causes spitting back through carburettor

 
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For instance; if you accidentally plugged one of the sparkplug wires onto the wrong spark plug, it is going to cause spark to ignite that plug at the wrong time which could cause an exhaust backfire, or an intake backfire, depending on where either valve is at the time the spark occurs. However, if the engine "ran when parked" and you have changed all the ignition parts you listed... don't touch the timing at this point. What has been done to the car/engine since the engine last ran correctly? and when i got it all put back together i went to pull it to start it, it was not drawing fuel into the well, so i thought maybe the gasket was not sealing properly so i … I have a 06 raptor 350 and recently i added a jet kit and a pipe. It pushes the carb out of the intake hose after it spits back 4 or 5 times. This usually goes away once the engine warms-up. A rhythmic popping sound which is not as prominent as lean under power backfires. A sticky or burned exhaust valve can also cause some backfiring out the exhaust. That will prevent fuel flow and will cause a lean condition. Described variably as a sneeze, cough or stutter, an outboard motor or any engine will lose its ability to run smoothly if it does not receive enough fuel. If it sparks when the exhaust valve is open, then it'll cause a bang out the exhaust. Spitting and coughing can also be commonly caused by the accelerator pump in the carb not squirting enough fuel before the main jets start working. These engines were originally setup for five star fuel. It causes a misfire very similar to that of a cracked distributor cap. A cold engine needs more fuel to run, and a warmer engine runs more efficiently and needs less fuel, so if you are only spitting when the engine is cold, then most likely it's due to a lean condition. You currently have javascript disabled. If the petrol in the tank has been there more than a couple of years drain it all out and don't use it in any engine, not even a lawnmower unless it's a really cheap 2-stroke engine. A backfire results in a temporary loss of power and forward motion along with a … Basically, when that plug sparks out of turn, it lights the fuel in the cylinder - and that pressure has to go somewhere... so if the intake valve is open, it goes right back up through the intake manifold and out the carburetor with a "spit" and sometimes even a flame, or it goes out the exhaust and creates that loud BANG. Learn about coughing up white mucus. SBC 283 with 4 Holley 94. I'v gone through the lt side but I can't see a fault, doesn't mean there isn't one. If this happens when the engine is warm and you know that the timing is OK, then the mixture will need trimming richer on that cylinder. The backfiring through the carburetor (the coughing or spitting), on the other hand, frequently happens in the morning when the carb’s air/fuel mixture is too thin. A repetitive backfires are generated when the engine is simply running at idle or at cruising speed and can be inline with the engine RPM. If the petrol in the tank has been there more than a couple of years drain it all out and don't use it in any engine, not even a lawnmower unless it's a really cheap 2-stroke engine. If by spit through the carb, you mean backfire, it could be valves being too tight, too lean of a mixture (ie, there's a vacuum leak). Having timing that is too late (retarded) can cause this same thing sometimes if your engine is running too rich. If the problem persists after that, look for a lean fuel condition. The car has been stood since my grandfather fell ill and I'm getting it running again. Every time the blade and spade connection moves as a result of the mouvement of the engine as it runs, and the contact is broken for a moment; there will be a spark. Repetitive Back fire. So... when, and how, it backfires, or spits, will give you an indication for where to start looking so you can fix it. Having sat for years, you should count on cleaning the carb thoroughly as its float bowl and jet are likely full of gum and varnish. … Erratic slow running is often caused by air leaks, so verify there are none at the point of attachment to the cylinder or inlet pipe. I'd check to make sure all your vacuum lines are hooked up, including the one in the back for the power brakes. Certain situations will trigger an adrenaline rush, which is the release of adrenaline from the adrenal gland. So, look at all the connections in the low tension circuit of the ignition system. You could also check to make sure your choke is working. If it's stuck open when the engine is cold, then it isn't doing its job by richening-up the mixture and it could definitely cause spitting. agree with what everyone above says If there is any cross firing going on, you'll certainly see the blue spark when it happens. They don't need lead, but they like octane! the engine i brought in ran when i brought it and i took it all apart and reassembled it. Backfiring caused by internal carburetor problems is a result of a defective accelerator pump. Now think about loose contacts in the primary circuit. Thought I had it, but alas seems to change its mind if I look at it funny. Since then my carb has been sounding like it is backfiring. An engine backfire is an explosion produced by an internal combustion engine. The ignition system works bij interrupting the primary current. In a 2 stroke 70H.P Veinrude, the spitting of fuel back through the carb can be caused by excessive fuel - a carb problem- and/or a reed valve problem. With it backfiring out of both the carb AND the exhaust I would carry out a complete tune up. However, don't do anything to the carb until you have read up on what is involved and posted back identifying which type carb is on the engine. As Doug suggests, a good clean-up of the petrol pipes and carb could be first move. It can also be an early indicator of engine failure.... compression leaking by rings that are failing and are gouging the cylinder wall. That's not too uncommon if the carb is a bit old. If richening the mixture made the engine run better, this further points towards a gummed up carb that needs cleaning. When this happens while the exhaust valve is open, it will ignite the rich / unburned mixture inside the exhaust manifold (and tail pipes) and result in a big bang. If your air/fuel mixture is too rich and you have some unburned fuel in the exhaust system, cross firing from one spark plug wire to another can occur if they are touching each other which will send juice to a sparkplug that isn't supposed to be getting it. If it sparks when the intake valve is open, you're going to get a pop back up through the carb. If you spit the instant you blip the throttle, then it's probably the accelerator pump in the carb not working, or not squirting enough fuel, so the engine takes a gulp of air and goes lean, which causes the spit back-up through the … Also in old machines look out for air leaks caused by a … Value clearance have been done but timing is carried out by measuring the hight of the piston in cylinder one and I haven't located his tool yet. This could mean that it's plugged up with some dirt, or a piece of something that got through your fuel filter, or it could just be out of adjustment or maybe the accelerator pump itself has just gone bad and can't squirt any fuel anymore. There are several ways to prevent backfires. For the best deals on your performance parts and accessories with the best service, choose where I order all of my components from... Competition Products. Backfiring through the exhaust is a result of problems arising out of rich fuel mixture and out-of-turn sparking of spark plugs. Carbon tracking can also form on spark plug wires or ignition coils that are mounted directly onto the spark plug. If its still giving trouble, you might need to give the carb a good cleaning, which mostly sucks so because I'm lazy I'd try to run some barryman's b12 through it … The compression on cylinders 1 to 4 is a little low but it is consistent. 1 turn out on all 4 seems to give the best response. Find out why you’re producing excess mucus and what it … We usually refer to an exhaust backfire as a "backfire", and backfiring through the carb as "spitting" or "coughing". It could be triggered by a bacterial infection or reaction to an allergy or virus. Atv is backfiring through carb.? What causes spitting through my DCOEs? This defense mechanism causes an … Troubleshooting - backfire through carburetor . Value clearance have been done but timing is carried out by measuring the hight of the piston in cylinder one and I haven't located his tool yet. Do you mean that without the air cleaner on you can actually see fuel vapor coming out of the carb intake or do you mean that the engine is backfiring through the carb when you rev it? OK, so having a bear trying to get the SBC running smooth. 15 Possible Causes For Excess Saliva Production ... as a result, cause excess saliva. Set the valve clearance with the engine cold. Took the words right outa my mouth Doug before I had time to think about it. Spitting back normally means the mixture is too weak and/or the timing is retarded so it might be worth having a play with that to start with. Backfiring can also be cause by a cracked distributor cap, or one that has carbon tracking inside which causes cross firing between the terminals inside, which in turn, sends spark to a spark plug that isn't ready for it yet. All three of these issues have a direct effect on the air-to-fuel ratio. Possible causes … Spitting actually begins when a spark is out of turn, which creates pressure from the burned fuel. Outboard motor sneezing is an audible result of a lean fuel mixture resulting from problems in the carburetor. Toward the back of your throat, on both sides, you'll see your tonsils—almond-shaped structures behind your back teeth. What’s more, spitting usually occurs when the engine is cold, mostly early morning, and will cease as soon as the engine becomes warm. How long has the engine been doing this and when did it last run correctly? However, frequent throat clearing can be a symptom of an underlying condition. This is to say that where the carburetor timing is such that there isn't enough time for complete combustion of fuel in the combustion chambers before the "next" mixture jets in, or where the carburetor is feeding the combustion chambers with too rich a mixture (one that has too much fuel for the air in it) or too lean a mixture (one that has too much air for the fuel in it) are all possible … If still fitted with points, change both the points and condenser then set the ignition timing. This is a result of working equipment, and is unlikely to cause damage. The carburetor must be clean, as fuel cannot flow properly through a dirty carburetor. A great way to check for any cross firing is to park in a dark place at night and open the hood with the engine running. I'll upload photos later of the mess in the fuel system but I'm sure you can imagine. So im pretty new to this whole small engine stuff and i'm currently taking a small engines class at my school. Several functions may not work. All recently rebuilt. Edited by Wim Fournier, 10 October 2015 - 12:58 PM. It was his daily car and he kept a record of every mile it drove. It isnt a flaming backfire or anything drastic, just some slight spits of raw fuel coming back out. And right in front of them, there's a … A problem which plaged the 3 cylinder Evinrudes. A spark at the cilinder which contactpoint in the distributor cap was nearest to the rotor point. Hey guys. I think its when im crossing over between the progression and main circuits. This causes an incomplete burn which causes the fumes to explode in the exhaust system along with an audible pop or bang sound. When the cilinder was in its working stroke and the ignition did not come because of lack of contact at the coil, and it comes a little later and the exhaustvalve has openend already, you hear it bark in the exhaust. Spitting back through the back of the carburettor normally indicates that the mixture is too weak, or the timing is hopelessly retarded. It'll usually cause a "snap" sound as well, but not always. there is more fuel and less air. Backfiring through the carb, and the exhaust now I think of it. For instance the connection at the coil. Assuming all of your plugs and wires are in the correct locations and you haven't messed with the timing at all, then the most common cause of backfiring through the carb (spitting or coughing) is in the morning when a carb's air/fuel mixture is a bit too lean. A spark at the cilinder which contactpoint in the distributor cap was nearest to the rotor point. My mini had exactly that issue a few weeks ago. However, this may not last long, a good one blast on that moment is all that it takes when the engine is totally warmed up. Remove the float bowl lid and use spray carb cleaner to wash out the gunk in the bottom of the bowl. Cheers. Define "spits back". This is the main reason why modified Harley engines tend to backfire through the carburetor more frequently than stock engines. If cylinder one is supposed to be sucking in the air into the cylinder but the cylinders spark plug ignites during that process this can cause your engine to backfire back through the carburetor. A sealing ring is fitted into the attachment flange of the carburetter. Next I'd have a look at the carburetor, take off the bowl and see if its all gummed up with crud, if so clean it. However, they do have a side mounted float bowl like the HS series. Page 2 of 2 - Spitting Back Through The Carb - posted in Problems, Questions and Technical: I know very little about H carbs. This is why they make spark plug wire separators - to help keep cross firing at a minimum. I richened the carb by one flat on the carburetor just out of interest and it did improve the running but I haven't got a gas analyzer and I don't want to guess the mixture. If it does this after you rev the engine and it backfires on the way back down to idle, this is typical of an exhaust system sucking air. Rare causes for baby diarrhea Very rare causes of diarrhea include serious illnesses. When this cilinder is in its stroke with the inletvalve open, you hear it bark in the carburettor. Now getting a backfire through the carb (seems to always be the one over the 5/7 cylinders) on acceleration. If you haven't messed with your timing though, then this is probably not your problem. Could it be the idle jet id clogged again some how? Related Articles. When you hear a backfire, you need to determine whether it is backfiring out the exhaust or back up through the carb. Please re-enable javascript to access full functionality. By: Bill Tichenor | 12/02/2009 < Back to Motor Life Home.   However, there is a 20 lb difference between 1 and 6 on the dry test and 15 on the wet test, which is outside the usual 10 lb acceptable level. For instance the connection at the coil. Re: Engine Spitting Back Through Carbs? Next questions. Is my timing too far retarded? it only does it when it is idling and at low speed cruising. I richened the carb by one flat on the carburetor just out of interest and it did improve the running but I haven't got a gas analyzer and I don't want to guess the mixture. also check condenser & LT wiring esp base plate earth in dizzi, & points condition This can also happen if one of the plug wires isn't in the right spot within the firing order on the distributor cap, or down at the spark plugs themselves. People with swollen adenoids also tend to breathe through their mouth because their nose is blocked and may experience symptoms like bad breath, cracked lips, a runny nose, and dry mouth. Intake manifold air leak: A common and continuing problem with Harley engines is air leaks around the junction of the manifold and the cylinder heads. Other causes of backfire are bad or weak fuel pumps, low fuel pressure and clogged fuel filters. First thing that comes to mind is irregular firing. Will have another look, This is not recommended for shared computers, Back to Problems, Questions and Technical. It mostly occurs under very light load at say 3,000rpm. It is jetted like it said and the fuel mixture screw is 3 turns out like the instructions say. I am suggesting checking the ignition timing which involves using a timing light to illuminate the timing marks on the front pulley. Selection and tuning of Weber DCOE Carburettors Are you using decent octane petrol? I'll assume that you're talking about popping out the exhaust pipe. Throat clearing is a normal response to irritation inside the throat. My buddy has a big bear 400 that is spitting back through the carb at idle and just above idle. And your problem will be over! Every time the blade and spade connection moves as a result of the mouvement of the engine as it runs, and the contact is broken for a moment; there will be a spark. Tags: Carburetor Installation and Tuning, Video, carburetor tuning and adjustments. if all above is good , then I would check compression , in case valves are leaking / sticking as engine has been stood. also check condenser & LT wiring esp base plate earth in dizzi, & points condition, if all above is good , then I would check compression , in case valves are leaking / sticking as engine has been stood. If the RMA still has original carb fitted it should be SU H4 type. Spitting and coughing can also be commonly caused by the accelerator pump in the carb not squirting enough fuel before the main jets start working.   You are confusing valve timing with ignition timing. This is usually only an issue when starting up a new engine or when you changed-out a distributor or something and you don't know where the timing is exactly at until you run it and get a timing light on it. The ratio of air to fuel in the mixture gets skewed in favour of fuel i.e. If you spit the instant you blip the throttle, then it's probably the accelerator pump in the carb not working, or not squirting enough fuel, so the engine takes a gulp of air and goes lean, which causes the spit back-up through the carb. Don't start at the 'far' end. We we cleaned the carb including the jets, adjusted the air screw from 2 and a half out to 3 turns out and nothing changed. Is this an HS or HIF series carb on your car's engine? I'll upload photos later of the mess in the fuel system but I'm sure you can imagine. Use paper towels to blot up the mess. While backfiring comes with an explosion in the exhaust system, spitting leads to a reaction in the carburettor. Since number 6 didn't change, that might indicate a sticking/burnt valve which could be the source of the pop back in your carb. "Backfiring" is usually caused by a spark plug "sparking" when it isn't its turn and the exhaust valve is open. As a quick clean, try the following. Some people refer to backfiring as popping from the exhaust while others refer to it as the engine spitting through the carburetor. As Doug suggests, a good clean-up of the petrol pipes and carb could be first move. Symptom of lean mixture with choke on. However seeing as it has sat for a few years everything could have changed through lack of use. The problem list below will give you an idea of what causes could be generating this condition. In the same way, part of the spark takes an incorrect path, and the remaining spark isn’t enough to ignite the fuel, leaving some in the cylinder. When the exhaust valve opens, the mixture isn't done burning so it ignites the unburned fuel in the exhaust manifold (or header collector) and causes a loud bang. Footage taken from Holley Carburetor Installation & Tuning DVD. However seeing as it has sat for a few years everything could have changed through lack of use. Check choke mechanism to ensure that it is moving freely when the cable is being pulled, also watch the mechanism between the carbs again to ensure that it is attached at both ends. Take it easy. If the RMA still has original carb fitted it should be SU H4 type.

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