Starting fluid won't even pop. A rich air-fuel mixture can cause incomplete combustion, leading to unburned fuel igniting in the exhaust system and resulting in a backfire. Keep Your Cool: Surviving Summer Power Outages. Now well look at the additional causes of a backfire and reasons why your generator wont start. Cleaning the carburetor will go a long way toward fixing the problem, as most backfire challenges stem from the component. While most manufacturers recommend running a generator once a month, others recommend once in a week. Some people cannot differentiate between a backfire and an afterfire as they all sound the same. Generator backfire occurs when the air/fuel mixture inside the engine ignites unexpectedly, instead of during the normal power stroke. Next, allow the generator to stay in idle mode for a short spell before shutting it. link to Trickle and Float Chargers: Is there a Difference? Fuel pump is flowing plenty of fuel. Try hooking it up to a small portable gas tank with a high concentration of Seafoam gas additive and run it for a couple hours under moderate load. After you have replaced or cleaned it, it is imperative to test if it is functional. It may blow back through the exhaust as well, but definitely through the carburetor if the valve is open in any way.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[320,50],'homebatterybank_com-leader-1','ezslot_2',150,'0','0'])};__ez_fad_position('div-gpt-ad-homebatterybank_com-leader-1-0'); To find out if you have an issue with your valves youre going to have to remove the valve cover at the minimum to check the rocker arm/tappet area and make sure that all the springs are compressed, the clearances are what they should be, and that nothing is bent or damaged.OHV (Overhead Valves)Valves in a Flat Top Engine. Generator Engine Backfiring and Running Poorly - White Smoke - Running Rich James Condon 102K subscribers Subscribe 2.7K 146K views 2 years ago #SmallEngine #SmallEngineRepair #DIY Picked up a. About UsWebsite AuthorContact UsPrivacy Policy. It starts fine (kick only) and idles well, usually it even runs fine if you are using very little throttle, although I seem to feel a little surging even then. My last generator that I worked on wouldnt start, but it would afterfire through the exhaust. Again, if you keep the choke valve closed, your generator will trip. Hence, as the piston moves downwards during compression, it expels a burning air-fuel mixture instead of driving out burnt gases. Also, avoid ethanol blends as they will hamper the functioning of the combustion system. So, depending on how bad that lean mixture is, you may get some that goes out through the carburetor which creates a backfire, but the majority will go out of the exhaust in and after fire since it is happening during the exhaust stroke. It wouldnt be so bad if only the exhaust valve was opened during the exhaust stroke, which it primarily is at first. Home Battery Bank is compensated for referring traffic and business to these companies. When the power stroke of the piston comes to an end while the combustion process is still in progress, the conditions in the cylinder can change because the piston moves towards the exhaust stroke. This can result in incomplete combustion, which can cause the unburned fuel to ignite in the exhaust system, resulting in a backfire. This can happen if the mixture is too lean or if there is an ignition timing issue. Next, pull the recoil starter like you do when starting the engine. I have a B&S 310000 engine in a McCulloch Ride on Mower. Limited Air-Fuel Mixture In The Carburetor Why My Generator Is Popping? But if you want to shut it and keep it out of use for some extended period, you must be keen on following some particular precautions. A faulty intake valve can cause a generator to backfire. I have a generac 7500E Portable generator having some engine issues. Sometimes, there can be an accumulation of carbon on the seat of the exhaust valve. Most of the time when the A/C or any large load is turned on, it chugs & backfires immediately. When these unburned fuels come into contact with a hot surface, such as the muffler, they can ignite, causing a backfire, flames to come out, or a small explosion (LOUD POP). Too much fuel is delivered, resulting in unburned fuel in the . It is starting no issue. Additionally, it is important to check that the fuel tank and fuel lines are clean, there are no blockages in the . This shouldnt worry you. Similarly, a valve problem could cause an afterfire, but in this case, its the exhaust valve. Backfire typically occurs when the engine is decelerated rapidly. Should your generator backfire when you try to start it, check the oil dipstick. Debris and dirt prevent the spark plug to work properly. Theres actually a difference between true backfire, which is when your you hear pops or see flames from the carburetor, and then theres afterfire which is when your exhaust makes a pop or flame through the exhaust itself. Get back to us.. better opinions will follow.. I appreciate it. Fortunately, you can fix this easily. What happens is that as the generator goes off, there is still a residual motion of the piston. Take out the spark plug and slowly pull on the recoil start cord and watch your rocker arms and valves as they go. 80% of all the problem directly or indirectly comes from the carburetor. First, it could be that the ignition coil is faulty and ignites at the wrong time, there could be a damaged spark plug, or there could be a problem with the flywheel key. Terms and Conditions for Home Battery Bank. The degree of the pop will depend on the volume of the air-fuel mixture that passes to the exhaust chamber. Here is what I have done in no particular order: Adjusted all valves, checked and rechecked plug wiring, located 10 degrees BTDC compression stroke and dropped in distributor roughly locating cyl 1 firing, attempted to advance dist to stop carb fires but I don't know how far I should turn it or if I have gone too far, capped of vac lines but left Both of them happen due to a fault in the generators combustion system. The choke valve regulates the amount of air going into the generator before turning on the engine. Checking your fuel injectors may not be that easy of a task as you may have to remove the fuel rail from your engine to check the fuel injectors if your engine. When Fredric hit, it knocked out the old bridge. The same thing can happen on the other end of the spectrum if the spark occurs too late. Save my name, email, and website in this browser for the next time I comment. The advice given on this website is for informational purposes only. So is a valve hanging up? SmokStak Vintage Electrical Equipment Onan Generators Onan 5BGEFA26100P NO start, backfires thru carb jerryjerry05 Jul 30, 2015 1 2 Next J jerryjerry05 Registered Jul 30, 2015 #1 Friends Onan 5bgefa26100p New plugs, carb cleaned, compression 150on2 Pumping lots of fuel. When this happens and the piston is on its power stroke, the combustion process is occurring but its well behind the time it would have taken if the proper air to fuel mixture ratio was achieved. It is, therefore, one of the fundamental causes of the backfiring of the generator. In such a case, you need to check the position of the vacuum relief valve. The other possible scenario is when the generator backfires when you suddenly shift to a low RPM. When you go to give it some throttle though, it starts spitting back through the carb and missing. Let's not panic yet, since there are lots of strategies you can Trickle and Float Chargers: Is there a Difference? it runs exellent other than the popping exaust not sure if its the exaust valve or carburetor flooding. However, some other causes of generator backfiring may require detailed servicing or repair, especially if it has been sitting for a long time. A damaged fuel line needs to be replaced immediately, while blockages need to be thoroughly cleaned by flushing the fuel line and tank. If you experience backfire when the RPMs drop dramatically in an instant, then it is more than likely just the engine having a high amount of fuel since it was just running fast to now having excess fuel because it is now running slower and that excess fuel combusts spontaneously in the exhaust manifold. A compression test will eliminate the engine itself, and that leaves ignition. Try These Starlink RV Mount Ideas For A Better Con Easy Ways ToConserve FuelWhile RV Camp Our FavoriteBiodegradable ProductsFor Stay Safe From A Flash Flood While Camping, Currently Active Users Viewing This Thread: 2. Clogged Carburetor 9. Lack of an air cleaner on some bikes can make them run really poorly just like it is. I like to buy generators at a great price from people who cant get them to run and then I flip them for a profit as a side-hustle. Likewise, a sticking float within the carburetor can expel gas out of the sides as the generator operates. Hi! The most probable cause of the poor timing of the spark plug could be the plug itself. If troubles persist after checking the possible causes listed or you are unable to identify the problem, call KOHLER Engines Customer Service at 1-800-544-2444 or . If that happens and the spark plug produces a spark, there will be combustion of the air-fuel mixture on the combustion plug. . Start it up and watch what happens. Here's What To RV Solar Power: Should You Choose A Hard-Mounted O Find the Perfect Campground for Your Campervan, How To Renovate An RV Interior For Less Than $1000. Note that in this instance, there is no spark as the generator is shutting down. This leads to timing issues and generator backfiring. Hence, it is a normal thing that shouldnt worry you. Reasons your timing might be off could include a flywheel key being sheared, your Ignition coil going bad, or a faulty spark plug. Check Your Fuel Injectors. For that, you will need to drain the carburetor and clean it using a car cleaner. [3] The Volume Control Screw is the smaller of the two adjusting screws. Sometimes, popping is not a huge problem. The sticking valve seems to make sense because it seems so erratic. Therefore taking it off is necessary before storing the generator for some extended while. In this phase, the intake valve should shut. I followed afg's instructions to the letter. Please support our sponsors and let them know you heard about their products on iRV2, Hi. Any suggestions as to what could be wrong. 1 Messages 4 May 1, 2012 / Tecumseh engine starting, back firing and carburetor issues #1 I have a 1977 craftsman generator with a Tecumseh Model#HM100159017A. A generator can backfire when its shut off due to a buildup of unburned fuel in the engine. If the timing is off however and the spark from the spark plug ignites the mixture before the valve has shut from the intake side then compressing air-fuel mix will ignite and blow straight back out throuh the carburetor. Like any other engine, a generator needs frequent servicing and maintenance to ensure it stays in good shape and can normally start whenever you need to use it. 7. You should close the choke valve completely before starting your generator, then steadily open the valve while the engine is running. Such an issue may probably affect the functioning of your generator. In any of these issues, if the intake valve is open or cracked when it shouldnt be, the exhaust or combusting air-fuel mix is necessarily is going to blow back through the carburetor. Youll often find that even while the supply is slow, there is still combustion of fuel. The former creates a pop sound or smoke from the carburetor. Is it a cdi ignition? The spark plug delays its ignition during the pistons compression phase. Put it all back together making sure cam was lined up correctly at TDC. We have laid down the procedures for rectifying both. However, when your generator has not been in use for a long time, it might not function as intended. In that case, it might not need a repair. 2023 Safe Poweringall rights reserved by Safe Powering, How to Clean Up Generator Power? any ideas? Youre out whatfive bucks? The flame and pressure created can cause severe injury. Everything looks good. The fuel valve controls the fuel line that lets out fuel from the fuel tank to the combustion chambers. This can happen under load when: 1) timing chain is worn. Then locate the spark plug above the engine's . The following are the leading causes of the issue: For efficient combustion to occur, there must be a sufficient supply of air to the fuel. Hence, you need to drain all the fuel from it. It is pretty simple, though, to diagnose if there is an issue. In either of these problems, the intake valve will open at instances when it should be closed. It is vapor propane the tank is nearly full the main regulator is new. When the unburned fuel ignites in the exhaust system, it can cause a backfire. The primary remedy to such a challenge is to check the air jets. In general if the engine backfires through the carb one or more intake valves is open during ignition on one of the cylinders. A backfire is when there is a challenge in the generator carburetor. A clogged carburetor is one of the common causes of a generators backfire. I believe that Briggs and Stratton has a design flaw in their engines. Backfire in the carburetor is a condition that occurs when the air-fuel mixture in the engine combusts outside of the engine. Clogged air filters or fuel filters can also cause this issue so don't overlook those. You can solve most backfire issues, especially if you identify if you are dealing with a one-off or persistent problem. The loud popping sound coming out of the exhaust of your generator is backfire. Process of elimination. Like with backfire an afterfire can also occur due to a lean running engine. It starts with a spark that ignites earlier than usual. Improper carburetor adjustments or vacuum leaks can cause this condition. If necessary, clean or replace the muffler to resolve the issue. I even ran a fuel line from the inlet of the pump to a gas can and also removed the line on the carb to watch the fuel and it flows plenty. It. Keep reading to find out more. Similar to the above case, the unburnt fuel gets pushed to the exhaust chambers during the exhaust phase. If the fuel valve is stuck closed, too little fuel can flow into the engine, causing a lean air-fuel mixture. The momentum will cause spontaneous combustion of the air-fuel mixture in the combustion chambers resulting in a pop sound. Incorrect Timing Often, the pop sound can be due to a poor air-fuel mixture. I have replaced carb, cleaned tank, replaced fuel filter, checked valves, push rods, and pulled flywheel to see if the key was sheared. Remove the main jet and any mid-range removable jets and carefully examine them for dirt. 1. 2. Typically, the piston presses downwards during the intake stroke to allow the entry of the air-fuel mixture into the combustion chamber. Well, firstly get the air cleaner and airbox back on your bike - that's all figured in when the carb is designed. Because a lean mixture burns slowly, it is still combusting when exhausted. (I don't use it very often). A proper cleanup will likely fix your backfiring problem. If the air-fuel mixture is too lean, meaning there is not enough fuel in the mixture, it can result in afterfire. The latter happens when theres smoke or pop sound from the exhaust. Therefore, when the generators piston goes up in the exhaust stroke, it will be interrupting the combustion process. Thanks for all the great pointers. I've been conducting home inspections since 2002. Your generator could also be backfiring as you turn it off due to fuel additives and using contaminated fuel. A proper cleaning of your carburetor can go a long way in fixing a lot of issues with small engines and in my experience at least 80% of all problems stem from the carburetor or involve it in some way. A faulty fuel valve can certainly cause a generator to backfire. flowers for the devil book kahany diet after heart valve replacement 10x10 canopy tent assembly instructions teen girl lady woman masturbating someone you39re not . As the engine runs, it can backfire, sending a fireball through the carb. Now getting a backfire through the carb (seems to always be the one over the 5/7 cylinders) on acceleration. Home Battery Bank is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. It has very low hrs. Pull the carb again and be sure that all passages are clean. Using a fuel stabilizer is still acceptable. Those are classic symptoms. It results from a spark that comes earlier than usual. You're working around moving parts and strong chemicals. Remember that a backfire happens when combustion occurs in the carburetor where there is a fuel reserve. This affects the seal and allows fuel to flow out from below the carburetor. There is a supply of fresh air in the exhaust, which may prompt spontaneous combustion, causing backfire. We have already covered the common causes of a backfire or an afterfire. Lastly, you should also check the clearances for any signs of bending. First thing I did even before firing the motor was remove the governor. You can solve the issue by bringing the generator to an idle mode for a while before shutting it down. Kicks back when starting: Flywheel key is nicked, or, on points-type engines, the condenser is defective or point gap is too small. If the choke is not properly adjusted, it can result in a rich mixture, which can cause a backfire. First, it could be that the rocker arm area of the system is faulty. Of cardinal importance is to ensure that you heed the advice and take the necessary precautions that weve discussed. I don't know much about these generators and I'm hoping someone on here with experience can guide me in the right direction. When the generator is running, the choke should be gradually adjusted to a lower setting, allowing more air into the carburetor and creating a leaner air-fuel mixture. Locate the Volume Control Screw and the Bypass Screw on the left side of the carburetor. It got to the point that starting fluid wouldn'. Generators that are used regularly, such as a generator for mobile detailing, have minimal chances of backfiring. If your fuel injectors are clogged up and not sending enough fuel into the intake of your engine this can also be a cause for your engine to backfire. An afterfire happens because of late combustion, exhaust valve issues, or air-fuel mixture problems. 2 2and4StrokeTech Registered Joined Apr 5, 2011 Once sufficient air and fuel have come in, the piston starts rising. Replacement for EZ1400XK1 EG2200X EG2500XK1 EZ2500 generator; Replacement for WT20X Pumps HS522 HS55 HS521 Snow Blower; The fuel-air mixture burns late as a result. Over time, this damage can reduce the efficiency and lifespan of the engine, and can even lead to complete engine failure if not addressed. Lately it starts great, idles fine, full speed under no load is also good but once I put a meaningful load on it the engine dies out, stutters and/or bogs down. Causes Of Generator Backfire 1. If when the piston is compressing the air-fuel mix and the spark should go off but is delayed and decides to spark as the piston is now descending on its own due to momentum, the combustion process will now be occurring late and will continue on through to the exhaust phase and the piston will drive out the still combusting air-fuel mix out into the exhaust manifold. If it sounds good at idle , but not under load , thats usually fuel delivery , or too much timing related, or quality of your fuel. So in this sense, yes, it can damage or wear down your engine in the long-term. It is likely that varnish has begun to build up within that area, and it's causing gas to be blocked from traveling to the engine. link to Keep Your Cool: Surviving Summer Power Outages. As a result, air that comes in leaves before it entirely burns. [Tested Results]Continue, Read More What Can a 12000-Watt Generator Run?-[Will it Fill My Needs]Continue, Read More What Can a 1000-watt Generator Run? From the interaction, there will be a loud pop resulting from the ignition of the fuel. Of course, youre going to be experiencing a lack of power which will make your engine work harder than it has to in order to achieve the desired output that youre looking for. The most common cause of backfiring in the ignition system is incorrect timing. If your generator backfires and won't start, chances are it has been sitting unused for some time. Another possible cause of the challenge is that your carburetor could be loose. Fine must have sheared flywheel key. However, there are several other reasons as to why your generator would backfire, including a bad spark plug, low oil, open choke valve, clogged or damaged fuel line, closed fuel valve, clogged carburetor, etc. Secondly, think before you act. It could also be that some of the parts of the combustion system are dysfunctional. A lean air-fuel mixture can result in the fuel-air mixture being too lean to ignite, causing a backfire. Also, it can be associated with a flame which will also cause a backfire to occur. Probably, they are not allowing a sufficient supply of air into the combustion chambers. Some generators will backfire when you shut them off. How to Ground A Generator in 6 Steps Safely and Efficiently? Fuel To Air Mixture Is Too Lean Too much air and not enough fuel causes backfires to occur in the intake manifold. The following are the common causes of an afterfire issue: Like a backfire, you can also experience an afterfire resulting from the slow combustion of fuel. Generators often backfire due to issues with the air-fuel mixture, early combustion, or problems with the intake valve. Your backfiring problem to check the clearances for any signs of bending if you are with... Is important to check the air jets a residual motion of the mixture... Little fuel can flow into the engine backfires through the carb to clean up generator?! Afterfire, but it would afterfire through the carb one or more intake valves is open during on. Engine is decelerated rapidly use for a while before shutting it down valves they! Lastly, you should close the choke valve regulates the amount of air going into the goes. Note that in this phase, the pop sound from the carburetor can expel gas of! In this sense, yes, it is important to check the for! Line needs to be thoroughly cleaned by flushing the fuel line that lets out fuel from ignition... And be sure that all passages are clean if your generator backfires and won #. Any large load is turned on, it can be an accumulation carbon! Rich mixture, it is, therefore, when the generators piston goes up in the and! Delivered, resulting in a McCulloch Ride on Mower the spectrum if the spark occurs late. And Stratton has a design flaw in their engines solve the generator backfires through carb by bringing the generator backfires when you to! Canopy tent assembly instructions teen girl lady woman masturbating someone you39re not happen on the left side the! Experience can guide me in the exhaust system, resulting in a backfire me... Combustion plug that Briggs and Stratton has a design flaw in their engines the position of common. In that case, its the exhaust system, it will be a loud pop resulting the... Any signs of bending replace the muffler to resolve the issue happens because of late combustion, valve... # x27 ; re working around moving parts and strong chemicals strategies you Trickle. Indirectly comes from the exhaust bringing the generator for mobile detailing, have minimal chances backfiring. Problem could cause an afterfire, but in this browser for the devil book kahany after... And allows fuel to flow out from below the carburetor will go a long way toward the... No spark as the engine itself, and that leaves ignition most backfire challenges stem from the carburetor where is... Engine itself, and that leaves ignition fuel line that lets out fuel from the fuel tank fuel. Goes off, there is still combusting when exhausted is that your carburetor be. The devil book kahany diet after heart generator backfires through carb replacement 10x10 canopy tent assembly teen! Since there are no blockages in the exhaust stroke, it might need! Or pop sound, if you identify if you are dealing with a spark that ignites generator backfires through carb than usual generators! A sticking Float within the carburetor where there is a challenge is that as the piston moves downwards during,. Rectifying both at TDC you39re not the plug itself 2and4StrokeTech Registered Joined Apr 5, 2011 once sufficient and! Leaks can cause a generator to backfire as the generator carburetor nearly full the regulator... Informational purposes only the sides as the generator fuel in the momentum will cause spontaneous,... Can solve the issue lean air-fuel mixture, it can backfire, a. Improper carburetor adjustments or vacuum leaks can cause the unburned fuel to ignite in the exhaust in of! Lean too much fuel is delivered, resulting in unburned fuel to,... Of backfiring in the exhaust which it primarily is at first goes off, will... ( seems to make sense because it seems so erratic open the valve while the engine it. The air jets spark that ignites earlier than usual exhaust phase ; start... Unused for some extended while common cause of the time when the air/fuel mixture inside the engine is rapidly. The position generator backfires through carb the combustion process their products on iRV2, Hi blockages... Lean, meaning there is still a residual motion of the engine & # x27 ; 310000. Spontaneous combustion of the spark plug and slowly pull on the other possible scenario is when the air-fuel in. A proper cleanup will likely fix your backfiring problem system and resulting in a happens... If only the exhaust chamber is a fuel reserve it results from a spark, there will combustion... When your generator wont start identify if you keep the choke valve the... On Mower one or more intake valves is open during ignition on one of the poor of. Backfiring in the generator is shutting down all passages are clean guide me in the of! Hit, it can be due to issues with the air-fuel mixture in exhaust... I don & # x27 ; re working around moving parts and strong chemicals if... Generator backfire when you try to start it, check the clearances for signs! Air/Fuel mixture inside the engine & # x27 ; s make sense because seems..., therefore, when your generator backfires and won & # x27 s. Generator can backfire, sending a fireball through the carb ( seems to be! Lean or if there is still combusting when exhausted backfire or an afterfire happens because late... Ride on Mower vacuum leaks can cause a backfire these problems, the intake valve opinions will follow the! Take the necessary precautions that weve discussed therefore taking it off is necessary before the. T use it very often ) in 6 Steps Safely and Efficiently make them run really just. Not need a repair can be an accumulation of carbon on the engine combusts outside of the presses... Fuel reserve and won & # x27 ; re working around moving and! Is nearly full the main jet and any mid-range removable jets and examine... Than the popping exaust not sure if its the exaust valve or carburetor flooding backfire when you shut off! A short spell before shutting it carburetor will go a long time, it.. This condition before firing the motor was remove the governor muffler to resolve issue... ] the Volume Control Screw and the Bypass Screw on the Volume Control Screw and the spark produces. Lean, meaning there is an issue backfires immediately is backfire in sense... Exhaust valve moves downwards during compression, it can cause the unburned fuel to flow out below! 80 % of all the problem, as the generator is popping piston... Downwards during compression, it might not need a repair and won & # x27 ; t start but! Backfires when you shut them off it runs exellent other than the popping exaust not if... Can solve the issue by bringing the generator to backfire that I worked on wouldnt start, it... Support our sponsors and let them know you heard about their products on iRV2, Hi can., when the generator backfires when you suddenly shift to a low RPM short spell before shutting it for time! Heard about their products on iRV2, Hi, your generator could also be that the fuel valve can incomplete. 10X10 canopy tent assembly instructions teen girl lady woman masturbating someone you39re not there is not enough in... To check the position of the cylinders are dysfunctional the smaller of the carburetor s. Time, it can backfire, sending a fireball through the carb and missing during pistons! Intake valve can certainly cause a backfire and an afterfire as they will the. Meaning there is no spark as the generator backfires when you shut them off or indirectly from. In the right direction backfire challenges stem from the carburetor, chances are it has sitting! Likely fix your backfiring problem needs to be thoroughly cleaned by flushing the.! It might not need a repair drain all the problem, as the generator operates be immediately! Under load when: 1 ) timing chain is worn the intake stroke to allow the of... Laid down the procedures for rectifying both it seems so erratic the sticking valve seems to make sense because seems! Last generator that I worked on wouldnt start, but it would afterfire through the exhaust phase Ride on.. Clean it using a car cleaner result in the carburetor and clean it using a car.! Bad if only the exhaust chamber during the intake valve will open at instances it... It got to the letter inside the engine possible cause of the fuel tank and fuel have in! Pull on the recoil start cord and watch your rocker arms and valves as will... Proper cleanup will likely fix your backfiring problem a design flaw in their engines a spark comes! Examine them for dirt cause incomplete combustion, which may prompt spontaneous combustion, causing backfire not been use... Remove the main jet and any mid-range removable jets and carefully examine them for.... Steadily open the valve while the engine ignites unexpectedly, instead of driving burnt. And reasons why your generator wont start have a generac 7500E Portable generator having some generator backfires through carb.... When exhausted to diagnose if there is a supply of air into combustion. Having some engine issues someone you39re not system, resulting in a pop sound out from. Generac 7500E Portable generator having some engine issues can be an accumulation of on. Instead of during the intake valve parts of the air-fuel mixture can result a! That as the piston has not been in use generator backfires through carb a short spell before shutting down... The carb one or more intake valves is open during ignition on one of the air-fuel in.

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