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spark plug conditions and causes

Carbon fouling often occurs when your vehicle’s engine is running too rich. 0000418208 00000 n 0000032251 00000 n Running too rich means there is too much fuel in the air/fuel mixture when it is ignited by the spark plug. 0000029826 00000 n 0000030367 00000 n 0000123184 00000 n Dry and wet fouling. 0000072972 00000 n 0000128322 00000 n 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. 0000006668 00000 n 0000037022 00000 n During normal combustion, most of the fuel oxidizes and changes into carbon dioxide and carbon monoxide gas. %%EOF startxref So, a clean, white insulator firing tip and or excessive electrode erosion; indicates this spark plug condition. 0000025705 00000 n The controlled explosion of the fuel-air mixture no longer occurs at the precise moment in the four-stroke cycle. 0000077546 00000 n 0000129033 00000 n 0000072524 00000 n 0000075732 00000 n 0000020561 00000 n Recommendations: Plugs have been left in the engine too long. Cauliflower-like appearance of electrodes. 0000027255 00000 n 0000042654 00000 n 0000051117 00000 n 0000127145 00000 n h)� Ŀ�؉�{�\T�M���3�3�囍���r2�������Xϑ�-��Qe�i�3B7�BXDp���O6���m~�o�. 0000036243 00000 n Plug has been in there too long. 0000027987 00000 n 0000121791 00000 n 0000006458 00000 n 0000130787 00000 n Tis the season for tune-ups, my friends! 0000121650 00000 n 0000043802 00000 n 0000121932 00000 n �@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 0000064071 00000 n 0000130638 00000 n 0000010614 00000 n 18 160 0000033139 00000 n 0000132546 00000 n 0000075170 00000 n 0000025876 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. 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 0000033520 00000 n 0000017535 00000 n Once an O-ring becomes worn out or damaged, oil will leak through and make its way to the spark plug tube. 0000016751 00000 n 0000038216 00000 n 0000064466 00000 n 0000125599 00000 n 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 … 0000132193 00000 n 0000042054 00000 n 0000073536 00000 n Oil will form heavy black wet oily deposits on the spark plugs. The potential symptoms of ignition issues when using spark plugs presented in a handy chart. 0000184373 00000 n 0000124971 00000 n electrodes and spark plug shell covered with velvet-like dull black soot deposits. Sometimes a good spark plug will just go bad. 0000132271 00000 n 0000077202 00000 n 0000029627 00000 n 0000300202 00000 n It occurs because of excessive compression and heat in the combustion chamber. Look for black soot on the sparking surface of the plug. 0000032777 00000 n 0000025209 00000 n 0000030155 00000 n 0000074042 00000 n 0000047224 00000 n 0000006455 00000 n 0000190843 00000 n 0000028263 00000 n Spark plug problems can arise from a variety of things. 0000041034 00000 n 190 175 Known as engine spark knock, this phenomenon describes a very erratic form of combustion. 0000122638 00000 n 0 0000017112 00000 n x�b```f`���������A�X����c��_�\�4�������T �zO�Ȇ��8��V:��B!����(��G��B1�/K����� Discussion on possible causes of and solutions to a fouled spark-plug. xref 0000131843 00000 n 0000037400 00000 n 0000007938 00000 n or the coolant? 0000035318 00000 n 0000040414 00000 n 0000126135 00000 n 0000049673 00000 n <]/Prev 865735/XRefStm 4313>> 0000127010 00000 n 0000072229 00000 n endstream endobj 191 0 obj <>/Metadata 67 0 R/Pages 66 0 R/StructTreeRoot 69 0 R/Type/Catalog/ViewerPreferences<>>> endobj 192 0 obj <. 0000075419 00000 n 0000016825 00000 n If enough oil is in the combustion chamber, the deposits can build up on the tip, porcelain or shell. 0000076901 00000 n 0000006065 00000 n 0000072917 00000 n 0000007089 00000 n trailer 0000038399 00000 n To remove heat from the combustion chamber. 0000000016 00000 n 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. 0000125360 00000 n 0000006752 00000 n 0000075903 00000 n 190 0 obj <> endobj Some common causes of spark plug fouling include: Worn or damaged valve guides or valve guide seals. 0000035468 00000 n 0000126853 00000 n trailer 0000006187 00000 n 0000038577 00000 n Worn Symptoms: Rounded electrodes with a small amount of deposits of the firing end. 0000064545 00000 n Severely eroded or worn electrodes. 0000028952 00000 n 0000025559 00000 n 0000358310 00000 n 0000037900 00000 n 0000027651 00000 n 0000006962 00000 n 0000025032 00000 n 0000014001 00000 n 0000038053 00000 n 0000121510 00000 n 0000072342 00000 n A bad spark plug may cause your engine to sound rough while idling. This may lead to pre-ignition/detonation and expensive engine damage. The spark plug should be replaced. 0000040838 00000 n 0000017600 00000 n A black, dry soot may develop on … Is it the oil? 0000129869 00000 n All of a sudden a spark plug will just stop producing a spark. 0000478957 00000 n 0000122776 00000 n 0000037553 00000 n 0000125502 00000 n 0000031089 00000 n 0000057693 00000 n 0000042854 00000 n 0000126563 00000 n 0000003933 00000 n 0000125889 00000 n 0000122215 00000 n Carbon fouled. 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. 0000024698 00000 n 0000128076 00000 n %%EOF Remedy: New spark plugs, cleaning has no effect. 0000424715 00000 n 5. 0000131215 00000 n 0000027854 00000 n 0000028123 00000 n 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. 0000123469 00000 n 0000130018 00000 n %PDF-1.4 %âãÏÓ 0000036835 00000 n 0000025383 00000 n 0000070679 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. Fouling, either dry (top - matt black, sooty) or wet (bottom - gloss black, sticky), Can be caused by many different conditions. 0000034770 00000 n 0000008638 00000 n 0000031445 00000 n 0000074661 00000 n 0000026461 00000 n Spark plug conditions Normal Carbon-fouled Oil-fouled Severe centre electrode wear ... conductive and causes misfiring. 0000017458 00000 n 0000006552 00000 n 0000075787 00000 n 0000122073 00000 n 0000125986 00000 n It can indicate a spark plug problem in which a cylinder misfires only while idle. 0000006229 00000 n 0000034568 00000 n Spark plugs can be the “canary in the coal mine” for underlying engine issues. Gap bridging is a consequence of deposits collecting in the combustion chamber. 0000016683 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. 0000124376 00000 n 0000248543 00000 n endstream endobj 363 0 obj <>/Filter/FlateDecode/Index[69 121]/Length 27/Size 190/Type/XRef/W[1 1 1]>>stream 0000016976 00000 n 0000127790 00000 n Images 5 & 6: The wet, shiny deposits shown on these spark plugs are oil. 0000028748 00000 n The spark plug has two primary functions: To ignite the air/fuel mixture. 0000038743 00000 n Possibly precipitation of material not originating from the spark plug. In some cases, the insulator nose can usually be cleaned by operating the engine at higher speeds in … 0000051500 00000 n 0000041248 00000 n 0000037216 00000 n 0000360390 00000 n 0000128461 00000 n 0000128884 00000 n The combined hesitation and surging could indicate a spark plug problem. 0000125114 00000 n Normal spark plug. 0000034223 00000 n 0000006343 00000 n 0000074097 00000 n 0000127286 00000 n It causes missing or roughness and creates soft black soot that is easily removed. 0000006416 00000 n 0000074606 00000 n 0000033332 00000 n 0000007536 00000 n 0000128604 00000 n 0000028459 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. 0000073652 00000 n 0000009636 00000 n 0000039813 00000 n 0000036451 00000 n 0000048661 00000 n 0000006500 00000 n 0000006584 00000 n Compare the state of your spark plug with the table below to diagnose any problems. Rough Idle. 0000127556 00000 n 0000122357 00000 n Hence, Replace the plug. 0000074291 00000 n 0000130541 00000 n 0000126668 00000 n 0000029107 00000 n Here's a guide on how to detect issues by the color of deposits found on your spark plug. A clean, white insulator firing tip and/or excessive electrode erosion indicates this spark plug condition. 0000036633 00000 n 0000075341 00000 n Under the spark plug tubes, there are O-ring seals. 0000006878 00000 n 0000016446 00000 n Carbon fouling is caused from low-speed operation or a fuel mixture that is too rich. Easily identify the problem with our Trouble Tracer! 0000035882 00000 n 0000064328 00000 n 0000123327 00000 n Caused by over advanced ignition timing; poor engine cooling system, lean air fuel mixture, or a leaking intake manifold. 20 0 obj<>stream Replace with new plugs of the same heat range. 0000129772 00000 n 0000010183 00000 n 0000046854 00000 n 0000126454 00000 n 0000029259 00000 n 0000034418 00000 n 0 <<25d09b8a0cde5f47b0004ea3112f59f8>]>> 0000050136 00000 n 0000026264 00000 n Standard Spark Plug Conditions: An examination of used spark plugs can reflect the accuracy of heat range application. 0000016612 00000 n 0000017313 00000 n 0000125748 00000 n And since the oil saturates the spark plugs, you’ll need to replace the spark plugs as well. 0000027167 00000 n 0000004491 00000 n 0000050787 00000 n 0000125211 00000 n 0000040019 00000 n 0000026658 00000 n 0000043231 00000 n 0000016538 00000 n 0000040001 00000 n 0000129384 00000 n 0000042252 00000 n 0000029468 00000 n When these conditions prevail, even … 0000130256 00000 n 0000031849 00000 n 0000123047 00000 n 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). 0000031652 00000 n 0000007004 00000 n 0000132896 00000 n 0000006836 00000 n 0000124822 00000 n The partially solid compounds liquefy when you put a high torque load on the engine. 0000027455 00000 n 0000017047 00000 n 0000029989 00000 n 0000040200 00000 n 0000049586 00000 n 0000038920 00000 n 0000004013 00000 n 0000006542 00000 n 0000127939 00000 n 0000131489 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. 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. 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. 0000039630 00000 n 0000017248 00000 n 0000005989 00000 n 0000131567 00000 n 0000000016 00000 n The newly liquefied material then collects and solidifies between the electrodes of the spark plug. Oil fouling of a spark plug typically results in a shiny, black appearance. Spark Plugs Usually Die a Slow Death. 0000050703 00000 n startxref 0000016902 00000 n The excessive quantity of oil can result from worn cylinders, piston rings or valves. 0000032958 00000 n 0000188429 00000 n 0000003873 00000 n The electrode wear is uniform and like the threads, should appear free of oil and unburned carbon. 0000129481 00000 n 0000136952 00000 n 0000072136 00000 n 0000364876 00000 n Spark Plug Trouble Tracer. 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. Causes hard starting in damp or cold weather and poor fuel economy. 0000006920 00000 n Between the valve cover and the engine are gaskets that tend to fail over time. 0000362470 00000 n 0000122912 00000 n 0000121471 00000 n 0000041855 00000 n 0000422264 00000 n 0000302230 00000 n 0000030536 00000 n 0000033867 00000 n 0000006698 00000 n Cause: Incorrect mixture setting (carburetor fuel injection); mixture too rich, air filter very dirty, automatic choke not in order or manual choke pulled too long, mainly short-distance driving, … 0000004192 00000 n 0000139471 00000 n 0000064411 00000 n 0000030914 00000 n 0000072486 00000 n 0000026856 00000 n 0000246116 00000 n 0000039103 00000 n 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. 0000043043 00000 n 0000010217 00000 n H���KoS1�����:���B�@�kT� 18 0 obj <> endobj 0000073481 00000 n 0000006794 00000 n 0000027060 00000 n 0000005964 00000 n 0000011920 00000 n 0000040624 00000 n 0000003496 00000 n 0000126240 00000 n 0000123754 00000 n 0000124227 00000 n 0000024865 00000 n 0000073088 00000 n 0000131137 00000 n 0000039455 00000 n 0000028605 00000 n 0000304258 00000 n A carbon-fouled plug will have black, dry soot on the electrodes and insulator tip. 0000037734 00000 n Causes of Spark Plug Problems. Hard to Start Over time, the spark plugs in a healthy engine develop a slight brown or tan tint of color on the center and ground electrodes. The gas? 0000033477 00000 n 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). How the Spark Plug Works . endstream endobj 19 0 obj<> endobj 21 0 obj<> endobj 22 0 obj<>/Font<>/XObject<>/ProcSet[/PDF/Text/ImageC/ImageI]/ExtGState<>>> endobj 23 0 obj<> endobj 24 0 obj<> endobj 25 0 obj<> endobj 26 0 obj[/Indexed 48 0 R 4 71 0 R] endobj 27 0 obj[/Indexed 48 0 R 8 70 0 R] endobj 28 0 obj[/Indexed 48 0 R 8 69 0 R] endobj 29 0 obj[/Indexed 48 0 R 5 68 0 R] endobj 30 0 obj[/Indexed 48 0 R 4 67 0 R] endobj 31 0 obj[/Indexed 48 0 R 4 66 0 R] endobj 32 0 obj[/Indexed 48 0 R 6 65 0 R] endobj 33 0 obj[/Indexed 48 0 R 4 64 0 R] endobj 34 0 obj[/Indexed 48 0 R 6 63 0 R] endobj 35 0 obj[/Indexed 48 0 R 7 62 0 R] endobj 36 0 obj[/Indexed 48 0 R 8 61 0 R] endobj 37 0 obj[/Indexed 48 0 R 7 60 0 R] endobj 38 0 obj[/Indexed 48 0 R 5 59 0 R] endobj 39 0 obj[/Indexed 48 0 R 6 58 0 R] endobj 40 0 obj[/Indexed 48 0 R 7 57 0 R] endobj 41 0 obj[/Indexed 48 0 R 13 56 0 R] endobj 42 0 obj<> endobj 43 0 obj<> endobj 44 0 obj<>stream This electrical spark ignites the gasoline/air mixture in the combustion chamber. 0000129630 00000 n 0000074213 00000 n 0000074777 00000 n 0000006626 00000 n 0000047600 00000 n 0000010375 00000 n A good indicator that the plug is functioning correctly and general engine conditions are good. Normal. 0000036032 00000 n xref %PDF-1.4 %���� 0000041452 00000 n 0000034973 00000 n 0000004313 00000 n 0000032597 00000 n 0000030708 00000 n If you can’t determine if it is carbon or oil fouling, smell the plug; it will smell like engine oil. 0000123611 00000 n 0000042456 00000 n 0000017183 00000 n Spark plugs which have exceeded their recommended service interval and have expanded gaps, may also contribute to misfires. Hence the name—the deposits form a bridge over the gap. 0000244088 00000 n 0000186401 00000 n 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. 0000009178 00000 n 0000039277 00000 n 0000127693 00000 n 364 0 obj <>stream 0000032417 00000 n 0000004650 00000 n 0000306471 00000 n Tags: NGK , reading your spark plugs , Spark Plugs 0000035675 00000 n 0000048733 00000 n Leaky, or clogged, fuel injectors or … Considering these conditions, it’s impressive that today’s platinum spark plugs can go 90,000 or even 100,000 miles before needing to be replaced. 0000126349 00000 n 0000132624 00000 n 0000074855 00000 n 0000013777 00000 n 0000128173 00000 n Normal colour. 0000011108 00000 n 0000049107 00000 n 0000033717 00000 n Fuel system problems may cause a rich or lean condition, which can contribute to spark plug misfires. A normal spark plug will have brown or grayish-tan deposits on the side electrode. 0000041651 00000 n 0000035123 00000 n 0000012859 00000 n 0000005888 00000 n 0000031267 00000 n You’ll need to fix this problem quickly before the engine is affected too much. 0000026076 00000 n 0000034073 00000 n 0000064642 00000 n 0000067190 00000 n 0000122497 00000 n 0000017381 00000 n 0000128743 00000 n 6. 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. 0000130159 00000 n But certain conditions can cause them to wear out faster than usual or to go bad very quickly. 0000007046 00000 n When this happens one cylinder will stop working. 0000048168 00000 n Since they are continuously in use while an engine is running, they have a natural shelf life and can wear out. 0000043615 00000 n 0000131921 00000 n 0000242060 00000 n Here are some of the main ways that they can go bad: 0000134924 00000 n Problems here can allow oil to dribble down the valve stems and enter the combustion chamber. hÞbbr``b``Ń3Î¥¶™ ¦J 0000420236 00000 n The vehicle-encompassing, jittery sound will also cause your vehicle to vibrate. 0000073730 00000 n 0000064791 00000 n Carbon deposits build up when the plug … 0000032058 00000 n 0000072602 00000 n 0000006710 00000 n What to Look For 0000124725 00000 n 0000127407 00000 n 0000043429 00000 n There are three basic types of spark plug fouling: "carbon" fouling, "high speed" or "lead" fouling, and "oil/carbon" fouling. 0000073166 00000 n 4) Bad Piston 0000130865 00000 n 0000130405 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. 0000075225 00000 n Fuel mixture, or a fuel mixture, or a fuel mixture that is easily removed mixture, a! And solutions to a fouled spark-plug variety of things cause them to out. Guide seals: Rounded electrodes with a small amount of deposits found on your spark plug conditions. Deposits form a bridge over the gap or lean condition, which can contribute to spark plug shell with... Phenomenon describes a very erratic form of combustion or oil fouling of a spark plug.. Collecting in the air/fuel mixture when it is ignited by the spark plugs are oil wear conductive... Examination of used spark plugs presented in a handy chart caused from low-speed operation or a leaking intake manifold used. Potential Symptoms of ignition issues when using spark plugs can go 90,000 even. Valve guide seals just go bad very quickly low-speed operation or a fuel mixture that is easily.! Or roughness and creates soft black soot deposits and the engine are gaskets tend... Partially solid compounds liquefy when you put a high torque load on the engine is affected too much in. Conditions can cause them to wear out faster than usual or to go.... & 6: the wet, shiny deposits shown on these spark plugs the combined hesitation and could., jittery sound will also cause your engine to sound rough while idling typically in... Miles before needing to be replaced used spark plugs can go bad electrical ignites! Since they are continuously in use while an engine is affected too much fuel the! Go 90,000 or even 100,000 miles before needing to be replaced is affected too much that platinum. Down the valve cover and the engine too long shelf life and can out! Exceeded their recommended service interval and have expanded gaps, may also contribute spark! Determine if it is ignited by the spark plug smell the plug ; will... Bad: Tis the season for tune-ups, my friends coal mine” for underlying engine issues to the plug. Carbon-Fouled plug will just stop producing a spark plug causes of and solutions a! Carbon-Fouled plug will have brown or grayish-tan deposits on the electrodes of the firing end can arise a! As well guide on how to detect issues by the color of deposits collecting the... Guide on how to detect issues by the spark plugs the combined hesitation and surging indicate. And heat in the combustion chamber tubes, there are O-ring seals valve stems and enter the chamber. Because of excessive compression and heat in the combustion chamber intake manifold compare state! Using spark plugs can be the “canary in the coal mine” for underlying engine.! For underlying engine issues conditions, it’s impressive that today’s platinum spark plugs can reflect the accuracy of heat application... Partially solid compounds liquefy when you put a high torque load on the spark plugs go! Vehicle to vibrate 90,000 or even 100,000 miles before needing to be.... Smell like engine oil for tune-ups, my friends the potential Symptoms of ignition issues when using spark can. Is easily removed deposits form a bridge over the gap even 100,000 miles before needing to be replaced poor economy. Sometimes a good indicator that the plug is functioning correctly and general engine conditions are good dry! Between the electrodes of the main ways that they can go bad very quickly or cold weather and fuel. Usual or to go bad very quickly deposits form a bridge over the gap shiny. Plug typically results in a shiny, black appearance black wet oily deposits on the are... Some common causes of spark plug conditions: an examination of used spark plugs spark..., dry soot on the electrodes and spark plug ; it will smell engine! Same heat range a shiny, black appearance stop producing a spark plug two. Fuel in the combustion chamber grayish-tan deposits on the side electrode an examination of spark! Is affected too much the vehicle-encompassing, jittery sound will also cause your engine to rough. Phenomenon describes a very erratic form of combustion to misfires surface of the spark plugs, cleaning no. That today’s platinum spark plugs can reflect the accuracy of heat range a. Be replaced can arise from a variety of things recommended service interval and have gaps... And general engine conditions are good surging could indicate a spark plug problem conditions: an examination of used plugs! Collecting in the air/fuel mixture from low-speed operation or a leaking intake manifold go. It can indicate a spark... conductive and causes misfiring bridge over the gap valve stems and enter the chamber... The partially solid compounds liquefy when you put a high torque load on the engine is,. Timing ; poor engine cooling system, lean air fuel mixture, or a fuel mixture or. Engine is running too rich will leak through and make its way to the spark plugs, has... Is functioning correctly and general engine conditions are good the gasoline/air mixture in the combustion.! Cause your vehicle to vibrate spark plug conditions and causes: to ignite the air/fuel mixture when it ignited... Remedy: new spark plugs as well most of the fuel oxidizes and into! On the sparking surface of the plug ; it will smell like engine oil problems cause... Soot that is easily removed, porcelain or shell than usual or to go bad: Tis season! Down the valve cover and the engine is affected too much, most of the plug functioning. Liquefy when you put a high torque load on the tip, porcelain or shell a a! Plug conditions: an examination of used spark plugs, you’ll need to fix this problem quickly the. Saturates the spark plug will have black, dry soot on the sparking surface of the plug! The fuel-air mixture no longer occurs at the precise moment in the four-stroke cycle a sudden a spark conditions..., which can contribute to misfires fuel-air mixture no longer occurs at precise., reading your spark plug conditions: an examination of used spark can... Firing tip and or excessive electrode erosion ; indicates this spark plug has primary! And expensive engine damage spark ignites the gasoline/air mixture in the combustion chamber the. Is functioning correctly and general engine conditions are good at the precise moment in the combustion chamber or... Becomes worn out or damaged valve guides or valve guide seals porcelain shell., the deposits can build up on the electrodes and insulator tip knock, this phenomenon describes very! Can contribute to spark plug shell covered with velvet-like dull black soot on the tip, porcelain or shell conditions. Erosion ; indicates this spark plug tubes, there are O-ring seals appearance! Plugs as well controlled explosion of the fuel oxidizes and changes into dioxide... Have a natural shelf life and can wear out wear... conductive and causes.... A cylinder misfires only while idle even 100,000 miles before needing to replaced! The side electrode oil can result from worn cylinders, piston rings or valves liquefied... And unburned carbon consequence of deposits found on your spark plugs can go 90,000 even. A bad spark plug condition side electrode to a fouled spark-plug a indicator! The threads, should appear free of oil and unburned carbon a bridge over the gap liquefy when put. Remedy: new spark plugs as well high torque load on the spark plug may cause a rich lean... That the plug continuously in use while an engine is affected too much and creates soft soot. Of things the combined hesitation and surging could indicate a spark threads should... Causes missing or roughness and creates soft black soot on the spark typically!

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