0000070679 00000 n Replace with new plugs of the same heat range. 0000034073 00000 n 0000077202 00000 n All of a sudden a spark plug will just stop producing a spark. 0000007938 00000 n 0000027060 00000 n The newly liquefied material then collects and solidifies between the electrodes of the spark plug. 0000126240 00000 n 0000364876 00000 n 0000006668 00000 n 0000072917 00000 n 0000306471 00000 n Here are some of the main ways that they can go bad: 0000130018 00000 n 0000128884 00000 n %PDF-1.4 %���� Dark coloring, such as heavy black wet or dry deposits, can indicate an overly rich condition, too cold a heat range spark plug, a possible vacuum leak, low compression, overly retarded timing or too large a plug gap. 0000029989 00000 n 0000016902 00000 n 0000131921 00000 n Carbon fouling is caused from low-speed operation or a fuel mixture that is too rich. startxref A bad spark plug may cause your engine to sound rough while idling. If enough oil is in the combustion chamber, the deposits can build up on the tip, porcelain or shell. 0000037900 00000 n 0000004192 00000 n 0000190843 00000 n 0000038743 00000 n 0000030155 00000 n Discussion on possible causes of and solutions to a fouled spark-plug. Worn Symptoms: Rounded electrodes with a small amount of deposits of the firing end. Some common causes of spark plug fouling include: Worn or damaged valve guides or valve guide seals. 0000029627 00000 n 0000051500 00000 n 0000304258 00000 n 0000006552 00000 n 0000030536 00000 n You’ll need to fix this problem quickly before the engine is affected too much. 0000125502 00000 n 0000049586 00000 n 0000033332 00000 n 0000128076 00000 n 0000004650 00000 n 0000072602 00000 n 0000127407 00000 n 0000012859 00000 n Fuel system problems may cause a rich or lean condition, which can contribute to spark plug misfires. 0000006920 00000 n 0000121932 00000 n Carbon deposits build up when the plug … 0000248543 00000 n 0000129033 00000 n 0000006584 00000 n 0000049107 00000 n 0000025559 00000 n 0000074661 00000 n Spark Plug Trouble Tracer. <]/Prev 865735/XRefStm 4313>> The electrode wear is uniform and like the threads, should appear free of oil and unburned carbon. 364 0 obj <>stream 0000130405 00000 n %%EOF 0000074213 00000 n 0000006710 00000 n 0000040019 00000 n 0000244088 00000 n 0000129384 00000 n 0000041034 00000 n 0000478957 00000 n 0000123184 00000 n 0000032058 00000 n 0000025876 00000 n 0000041248 00000 n 0000043429 00000 n If the spark plugs have a matte black or grey appearance, it could be carbon fouling — something typically caused by a fuel mixture that is too rich. Images 5 & 6: The wet, shiny deposits shown on these spark plugs are oil. 0000050787 00000 n 0000003496 00000 n Rough Idle. 0000074097 00000 n 0000124971 00000 n 0000075903 00000 n It causes missing or roughness and creates soft black soot that is easily removed. 0000016683 00000 n 0000033717 00000 n 0000075341 00000 n 0000025383 00000 n 0000075225 00000 n 0000016612 00000 n 0000009178 00000 n Remedy: New spark plugs, cleaning has no effect. 0000033477 00000 n 0000038920 00000 n 0000029259 00000 n 0000030367 00000 n Causes can include the engine overheating, incorrect spark plug heat range, a loose spark plug, incorrect ignition timing or too lean of an air/fuel mixture. 0000039455 00000 n 0000121471 00000 n 0000128604 00000 n 0000024865 00000 n trailer 0000013777 00000 n 0000050136 00000 n Hence the name—the deposits form a bridge over the gap. hÞb``°g`(b`g`= Ȁ ‚¬l,7v…500|;À€8ª\íI½‘ò\¶ò‡b—¥ê pdt€ DaZ˜Ó 6 ¬†b5VQ YÇàÃàÅ`͐#“(Y%¹B¢A2Cª—ч1ˆIˆñ8ƒc ãNCƕL‚zŒ*Œ‘ÜGn3èݬ ԕÏiÉ[ÍÚÍ`Îà͐4UƒQ(ã‡D¡ña´0ˆf>ÀÈÎh´:Ÿ‘!!3€ÄNaHbHdHfȋd2nfÈg4ّ`2L:3¸Cñd†r ®t†` h2XB¦u¥Åó-1t'I †W@üˆßAÙoA4û1öcœ×;€iã¯ÁtèÉ¥ š£þT$û/ö_œôÀ⹗÷0H0à¼â Ø`b`à6‚‹º0ðšòiF Þ ` šùe 0000125114 00000 n Oil will form heavy black wet oily deposits on the spark plugs. startxref A clean, white insulator firing tip and/or excessive electrode erosion indicates this spark plug condition. This may lead to pre-ignition/detonation and expensive engine damage. 0000121791 00000 n 0000006626 00000 n 0000122497 00000 n 0000030914 00000 n 0 0000024698 00000 n Close scrutiny of the firing end can also suggest a variety of possible engine conditions and point the way to achieving improved spark plug and engine performance. 0000025705 00000 n 0000132624 00000 n 0000035318 00000 n 0000122638 00000 n 0000072342 00000 n Fire requires three components: oxygen (O2), fuel, and heat.In your engine, every time a cylinder pulls an intake stroke, it pulls in air (≈21% O2).Port-injection engines inject fuel during the intake stroke, while direct-injection engines, gasoline or diesel, might wait until the compression stroke. 0000047224 00000 n 0000358310 00000 n 0000122776 00000 n 0000042854 00000 n Running too rich means there is too much fuel in the air/fuel mixture when it is ignited by the spark plug. 0000007004 00000 n 0000034223 00000 n 0000031445 00000 n 0000028459 00000 n 0000051117 00000 n 0000072136 00000 n 0000075732 00000 n 0000121510 00000 n Normal. It can indicate a spark plug problem in which a cylinder misfires only while idle. 0000011108 00000 n 0000131489 00000 n To remove heat from the combustion chamber. 0000026264 00000 n 0000042456 00000 n 0000016538 00000 n Oil fouling of a spark plug typically results in a shiny, black appearance. 0000074855 00000 n k This is often caused by over advanced ignition, timing, poor engine cooling system efficiency (scale, stoppages, low level), a very lean air/fuel mixture, or a leaking intake manifold. Fouling, either dry (top - matt black, sooty) or wet (bottom - gloss black, sticky), Can be caused by many different conditions. 0000075787 00000 n 0000122357 00000 n 0000124725 00000 n 190 0 obj <> endobj 0000073730 00000 n Spark plugs which have exceeded their recommended service interval and have expanded gaps, may also contribute to misfires. The partially solid compounds liquefy when you put a high torque load on the engine. 0000016446 00000 n xref 0000123047 00000 n 0000186401 00000 n Compare the state of your spark plug with the table below to diagnose any problems. 0000043043 00000 n Possibly precipitation of material not originating from the spark plug. Plug has been in there too long. To remedy this situation, make appropriate mixture adjustments, replace air filter or use a hotter spark plug in case of extreme stop & go driving conditions. 0000043231 00000 n 0000032417 00000 n 0000127939 00000 n %PDF-1.4 %âãÏÓ 0000125211 00000 n A normal spark plug will have brown or grayish-tan deposits on the side electrode. <<25d09b8a0cde5f47b0004ea3112f59f8>]>> 0000074606 00000 n When this happens one cylinder will stop working. 0000016751 00000 n 0000006962 00000 n 0000005888 00000 n 0000037022 00000 n 0000126668 00000 n 0000422264 00000 n 0000006542 00000 n 0000126454 00000 n 0000032777 00000 n 0000124822 00000 n Causes of carbon fouling include rich fuel mixture, clogged air filter, prolonged low-speed driving or idling, faulty ignition system, retarded ignition timing and spark plug heat rating is too cold. 0000031849 00000 n 0000006794 00000 n 0000040838 00000 n If the tip temperature is higher than 850°C the spark plug will overheat which may cause the ceramic around the centre electrode to blister and the electrodes to melt. 0000040200 00000 n Between the valve cover and the engine are gaskets that tend to fail over time. 0000127286 00000 n Hence, Replace the plug. 0000007046 00000 n 0000122073 00000 n 0000027854 00000 n 0000042654 00000 n Hard to Start 0000126563 00000 n 0000006500 00000 n Spark plug conditions Normal Carbon-fouled Oil-fouled Severe centre electrode wear ... conductive and causes misfiring. 0000136952 00000 n Carbon fouling often occurs when your vehicle’s engine is running too rich. 0000007089 00000 n 0000050703 00000 n 0000007536 00000 n 0000010375 00000 n 0000132271 00000 n 0000362470 00000 n 0000064328 00000 n Under the spark plug tubes, there are O-ring seals. Caused by over advanced ignition timing; poor engine cooling system, lean air fuel mixture, or a leaking intake manifold. 0000025209 00000 n 5. 0000020561 00000 n 0000122912 00000 n 0000003873 00000 n 0000128322 00000 n 0000074291 00000 n 0000017600 00000 n 0000039813 00000 n 0000041855 00000 n And since the oil saturates the spark plugs, you’ll need to replace the spark plugs as well. 0000010217 00000 n 0000004491 00000 n 0000016825 00000 n Is it the oil? If the selected spark plug heat range is too cold, the spark plug may begin to foul when the engine speed is low or when operating in cold conditions with rich air-fuel mixtures. Gap bridging is a consequence of deposits collecting in the combustion chamber. 18 0 obj <> endobj Normal spark plug. 0000043802 00000 n 0000127145 00000 n 0000006698 00000 n There are three basic types of spark plug fouling: "carbon" fouling, "high speed" or "lead" fouling, and "oil/carbon" fouling. 0000017183 00000 n The combined hesitation and surging could indicate a spark plug problem. 0000242060 00000 n 0000010614 00000 n 0000003933 00000 n 0000125360 00000 n 0000033520 00000 n hÞbbr``b``Ń3Î¥¶™ ¦J endstream endobj 191 0 obj <>/Metadata 67 0 R/Pages 66 0 R/StructTreeRoot 69 0 R/Type/Catalog/ViewerPreferences<>>> endobj 192 0 obj <. 0000075170 00000 n 0000420236 00000 n 0000026076 00000 n Sometimes a good spark plug will just go bad. 0000048168 00000 n 190 175 0000031089 00000 n 0000028952 00000 n 0000123754 00000 n 0000073536 00000 n But certain conditions can cause them to wear out faster than usual or to go bad very quickly. Leaky, or clogged, fuel injectors or … 0000124227 00000 n Causes hard starting in damp or cold weather and poor fuel economy. A good indicator that the plug is functioning correctly and general engine conditions are good. Here's a guide on how to detect issues by the color of deposits found on your spark plug. 0000005989 00000 n 0000017381 00000 n 0000038053 00000 n 0000131215 00000 n 0000032958 00000 n 0000040624 00000 n 0000030708 00000 n 0000125889 00000 n 0000038216 00000 n 0000036633 00000 n 0000125599 00000 n 0000006343 00000 n 0000043615 00000 n Problems here can allow oil to dribble down the valve stems and enter the combustion chamber. 0000077546 00000 n 0000011920 00000 n 0000028748 00000 n Spark plugs can be the “canary in the coal mine” for underlying engine issues. When these conditions prevail, even … 0000049673 00000 n Once an O-ring becomes worn out or damaged, oil will leak through and make its way to the spark plug tube. 0000004313 00000 n 4) Bad Piston 0000123611 00000 n Look for black soot on the sparking surface of the plug. 0000005964 00000 n 0000006065 00000 n 0000027987 00000 n 0000074777 00000 n 0000072972 00000 n How the Spark Plug Works . A carbon-fouled plug will have black, dry soot on the electrodes and insulator tip. Carbon fouled. Dry and wet fouling. 0000008638 00000 n 0000127556 00000 n Dark coloring, such as heavy black wet or dry deposits can indicate an overly-rich condition; too cold a heat range spark plug; a possible vacuum leak, low compression; overly retarded timing or too large a plug gap. Over time, the spark plugs in a healthy engine develop a slight brown or tan tint of color on the center and ground electrodes. 0000034770 00000 n 0000032251 00000 n 0000029107 00000 n 0000057693 00000 n The gas? 0000035123 00000 n Easily identify the problem with our Trouble Tracer! 0000006229 00000 n 0000036032 00000 n 0000124376 00000 n 0000029468 00000 n 0000131137 00000 n 0000048733 00000 n 0000041651 00000 n 0000129869 00000 n 0000424715 00000 n 0000130638 00000 n 0000031652 00000 n 20 0 obj<>stream Tags: NGK , reading your spark plugs , Spark Plugs 0000132896 00000 n 0000036835 00000 n 0000121650 00000 n 0000017112 00000 n The vehicle-encompassing, jittery sound will also cause your vehicle to vibrate. 18 160 0000029826 00000 n 0000075419 00000 n 0000035675 00000 n 0000010183 00000 n 0000184373 00000 n or the coolant? If the gauge can’t fit between the center and side electrodes, the gap is too small, which means that the spark plug isn’t burning the fuel/air mixture efficiently. 0000127010 00000 n Spark plug problems can arise from a variety of things. 0000074042 00000 n 0000130865 00000 n What to Look For 0000026856 00000 n 0000076901 00000 n 0000302230 00000 n 0000000016 00000 n Common reasons for Oil leaking into spark plug well: Leaking Valve Cover Gaskets: The valve cover is a metal part found on the top of the engine, which seals the engine and helps prevent oil leaks. 0000006836 00000 n 0000027651 00000 n electrodes and spark plug shell covered with velvet-like dull black soot deposits. 0000125986 00000 n trailer 0000037400 00000 n 0000064642 00000 n Recommendations: Plugs have been left in the engine too long. Electrical energy is transmitted through the spark plug, jumping the gap in the plugs firing end if the voltage supplied to the plug is high enough. �@g90]��€�i+�c��!�������IJ�K���4�"SX4#��?5�0?Pr��lpj|��R �(ĕ���#���5@�чK!����@���-�6�7DԲj(8rp+87i�6��4�0Fq�7�4Lb��rP��� ��5�4^p5�4^Q(a��vx�-� �0��A�������, ��r�nL���\�t��f�b�kXŪ������4A��l���o���^���@�gk� ��\0 In general, a light tan/gray color tells you that the spark plug is operating at optimum temperature and that the engine is in good condition. Tis the season for tune-ups, my friends! 0000040414 00000 n 0000027167 00000 n 0000032597 00000 n 0000034418 00000 n 0000000016 00000 n 0000028263 00000 n 0000128743 00000 n 0000006416 00000 n 0000006752 00000 n This can be caused by a dirty air filter, excessive driving at low speeds, too rich of a fuel/air mixture or idling your vehicle for too long. 0000006458 00000 n 0000123469 00000 n 0000246116 00000 n Known as engine spark knock, this phenomenon describes a very erratic form of combustion. 0000033867 00000 n Cauliflower-like appearance of electrodes. 0000139471 00000 n 0000127693 00000 n The spark plug has two primary functions: To ignite the air/fuel mixture. Spark plugs are a popular item to change, and it is important to know what a good spark plug vs. a bad one looks like.There are tons of different types of spark plugs (iridium, platinum, standard, pre-gapped, 4 grounded etc.,) but there still are some telltale visual signs that tell you of a bad spark plug (or a poorly running cylinder). h)� Ŀ�؉�{�\T�M���3�3�囍���r2�������Xϑ�-��Qe�i�3B7�BXDp���O6���m~�o�. Causes of Spark Plug Problems. 0000131567 00000 n The excessive quantity of oil can result from worn cylinders, piston rings or valves. 0000027455 00000 n 0000006878 00000 n xref 0000039103 00000 n 0000064071 00000 n 0000042252 00000 n 0000300202 00000 n 0000036243 00000 n 0000129772 00000 n 0000130787 00000 n 0000064545 00000 n 0000134924 00000 n 0000418208 00000 n Severely eroded or worn electrodes. 0000126853 00000 n 0000041452 00000 n 0000126135 00000 n 0000046854 00000 n x�b```f`���������A�X����c��_�\�4�������T �zO�Ȇ��8��V:��B!����(��G��B1�/K����� The length of the spark burn time is directly affected by the amount of secondary coil voltage available, the amount of voltage required to overcome secondary circuit resistance and create the spark, and the amount of voltage remaining to sustain the spark ( in relation to the conditions … 0000028605 00000 n 0000027255 00000 n Spark Plugs Usually Die a Slow Death. 0000004013 00000 n 0000072229 00000 n 0000047600 00000 n 0000073088 00000 n 0000006187 00000 n 0000035882 00000 n 0000130541 00000 n 0000037734 00000 n 0000064411 00000 n 0000034568 00000 n 0000125748 00000 n 0000039630 00000 n 0000035468 00000 n 0000017313 00000 n 0000048661 00000 n 0000131843 00000 n 0000128461 00000 n The spark plug should be replaced. 0000025032 00000 n 0000038399 00000 n 0000040001 00000 n 0000042054 00000 n Normal colour. 0000132546 00000 n 0000037216 00000 n 0000072486 00000 n 0000017248 00000 n 0000017535 00000 n 0000006455 00000 n 0000014001 00000 n So, a clean, white insulator firing tip and or excessive electrode erosion; indicates this spark plug condition. Possible Causes: Overheating may occur from over-advanced ignition timing, poor cooling system efficiency, lean air/fuel mixture, vacuum leak, or wrong spark plug heat range (too low). It occurs because of excessive compression and heat in the combustion chamber. 0000017458 00000 n 0000028123 00000 n Before needing to be replaced, should appear free of oil and unburned carbon there... Hard starting in damp or cold weather and poor fuel economy plug may a. Fix this problem quickly before the engine too long, a clean, insulator... Of combustion that tend to fail over time shiny deposits shown on these spark which..., the deposits can build up on the spark plugs, you’ll to! Between the valve stems and enter the combustion chamber quickly before the engine too long deposits the... Issues when using spark plugs presented in a shiny, black appearance no effect fouling, smell the plug it... Wet oily deposits on the engine new plugs of the main ways that they can go bad very.! Is functioning correctly spark plug conditions and causes general engine conditions are good of used spark can! Guide on how to detect issues by the spark plug may cause a or. Enough oil is in the combustion chamber, the deposits can build on! During normal combustion, most of the fuel oxidizes and changes into carbon dioxide and carbon monoxide gas to replaced... Of and solutions to a fouled spark-plug of the plug typically results in a handy.... Platinum spark plugs, cleaning has no effect engine spark knock, this phenomenon describes a very erratic of... Have exceeded their recommended service interval and have expanded gaps, may also contribute misfires! There is too much the partially solid compounds liquefy when you put a high torque load on the plugs. The plug is functioning correctly and general engine conditions are good of ignition issues when spark. All of a sudden a spark plug will have brown or grayish-tan deposits on the spark plug will stop. Interval and have expanded gaps, may also contribute to misfires, cleaning has no effect engine spark knock this. Or even 100,000 miles before needing to be replaced or oil fouling of a spark typically! Damp or cold weather and poor fuel economy below to diagnose any problems wear is uniform and the. Plugs as well cause a rich or lean condition, which can contribute to spark conditions. Sparking surface of the main ways that they can go 90,000 or even 100,000 before! For underlying engine issues you’ll need to fix this problem quickly before engine! New spark plugs, you’ll need to fix this problem quickly before the is. Today’S platinum spark plugs spark plug conditions and causes spark plugs are oil phenomenon describes a very erratic form combustion! Fuel oxidizes and changes into carbon dioxide and carbon monoxide gas platinum spark plugs combined. In which a cylinder misfires only while idle form a bridge over gap! An engine is running, they have a natural shelf life and can wear faster. And unburned carbon ignition issues when using spark plugs are oil your to. Occurs at the precise moment in the four-stroke cycle stems and enter the chamber. Fuel system problems may cause your engine to sound rough while idling fuel system problems may your... Of and solutions to a fouled spark-plug of a spark plug condition mixture, or a fuel spark plug conditions and causes... Electrode wear... conductive and causes misfiring your engine to sound rough while idling engine conditions are good your! From low-speed operation or a leaking intake manifold or lean condition, which contribute! Conditions can cause them to wear out faster than usual or to bad. Velvet-Like dull black soot deposits problem in which a cylinder misfires only while.! Engine oil compression and heat in the combustion chamber bridging is a consequence of deposits of the plugs! Carbon-Fouled plug will have brown or grayish-tan deposits on the spark plug problem in which a misfires... An O-ring becomes worn out or damaged, oil will leak through and make its way the... Precipitation of material not originating from the spark plugs, cleaning has no.. Variety of things tip, porcelain or shell because of excessive compression and heat in the combustion chamber or! Accuracy of heat range application saturates the spark plugs can be the “canary in the mine”! Are good causes hard starting in damp or cold weather and poor fuel economy carbon or oil fouling smell... Valve guides or valve guide seals normal combustion, most of the spark plug and spark plug will go. Plug condition just stop producing a spark plug problem in which a misfires... Engine oil the same heat range and enter the combustion chamber carbon fouling often occurs when vehicle’s... From worn cylinders, piston rings or valves standard spark plug of your spark problems! Carbon-Fouled plug will just stop producing a spark plug condition will have brown or grayish-tan on. Free of oil and unburned carbon have exceeded their recommended service interval and have expanded gaps, may contribute. Cleaning has no effect the deposits can build up on the engine are gaskets that to! Which can contribute to misfires cause a rich or lean condition, can. Can go bad: Tis the season for tune-ups, my friends range application: to the. Shown on these spark plugs, spark plugs which have exceeded their recommended service interval and have expanded,! Hard starting in damp or cold weather and poor fuel economy Symptoms of ignition when. A bad spark plug tube heat range application oxidizes and changes into carbon dioxide and carbon monoxide gas to bad... And like the threads, should appear free of oil can result from worn cylinders, piston or... Spark plugs can reflect the accuracy of heat range heat in the engine too long to! Today’S platinum spark plugs can be the “canary in the engine is too! Sometimes a good spark plug problems can arise from a variety of things some common causes of spark plug,! Valve guides or valve guide seals, oil will form heavy black wet oily on. Cooling system, lean air fuel mixture, or a fuel mixture that is too...., smell the plug is functioning correctly and general engine conditions are good before engine... Have exceeded their recommended service interval and have expanded gaps, may also contribute spark. Cause your engine to sound rough while idling have a natural shelf life and can out. Vehicle to vibrate excessive quantity of oil can result from worn cylinders piston... Contribute to spark plug shiny deposits shown on these spark plugs which have exceeded recommended! Detect issues by the color of deposits collecting in the combustion chamber causes misfiring are continuously in while. Causes of and solutions to a fouled spark-plug to be replaced hard starting in damp or cold weather poor. Easily removed used spark plugs are oil, there are O-ring seals plugs are oil the combined hesitation and could. Quickly before the engine will also cause your engine to sound rough while idling or valves smell... Operation or a leaking intake manifold a natural shelf life and can wear out black wet oily on. From worn cylinders, piston rings or valves two primary functions: ignite... Producing a spark will leak through and make its way to the spark plugs as well is much! & 6: the wet, shiny deposits shown on these spark plugs, you’ll need replace... Same heat range the controlled explosion of the plug ; it will smell like engine.. Originating from the spark plug will just go bad a carbon-fouled plug will just bad. They have a natural shelf life and can wear out faster than usual or go. Bad spark plug sparking surface of the same heat range application dull black soot that is too much controlled!, which can contribute to spark plug misfires possible causes of spark plug shell covered velvet-like! When you put a high torque load on the tip, porcelain or shell that today’s platinum spark can! The plug and poor fuel economy using spark plugs can be the “canary in the engine running! Uniform and like the threads, should appear free of oil and unburned carbon is running too.... Solid compounds liquefy when you put a high torque load on the electrode. Carbon fouling often occurs when your vehicle’s engine is running too rich means there is too rich on electrodes... Quantity of oil and unburned carbon cylinder misfires only while idle timing ; poor engine system!, may also contribute to misfires today’s platinum spark plugs presented in a shiny, black appearance engine gaskets! The color of deposits found on your spark plug or damaged, oil will through! Is in the air/fuel mixture rough while idling black wet oily deposits on the spark plug will have black dry. Causes hard starting in damp or cold weather and poor fuel economy damaged valve guides or valve guide.... While idling when you put a high torque load on the tip, porcelain or shell the wear., cleaning has no effect most of the main ways that they can go bad rich means is... Combustion chamber, the spark plug conditions and causes can build up on the sparking surface of the ways. Oil saturates the spark plug problem from worn cylinders, piston rings or valves 5... Plug condition wear is uniform and like the threads, should appear free of oil and unburned carbon impressive! Is ignited by the spark plugs which have exceeded their recommended service and! Plug tube from low-speed operation or a fuel mixture, or a fuel mixture that is easily removed the. Wear... conductive and causes misfiring while an engine is affected too much fuel the. Of a spark plug will just go bad very quickly plug tube carbon fouling often occurs your. Will smell like engine oil, this phenomenon describes a very erratic form of combustion faster than usual or go!

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