spark plug diagnosis chart

%%EOF Misfiring only when running at high speed or when accelerating suddenly. 0000001759 00000 n by Pat Goss. 12 Good. Make sure the engine has the correct spark plugs and they’re gapped correctly. 96 0 obj <>stream 13 Real Good. Also, the main advantage to checking out your spark plug color; is for a quick diagnostic tool. 6 Cold or Rich But OK. 7 Cold or Rich But OK. 8 Cold or Rich But OK. 9 Good. Look at end of the spark plug that was in the cylinder and examine it. Sooted — Carbon-fouled Insulator nose, electrodes and spark-plug shell covered with shiny soot or carbon residues. The first step is removing the spark plug you want to look at. Bad plugs can cause overheating, rough running, power loss and even engine failure. Trouble other than with the engine. Take the spark plug in your hand and begin looking at it for signs of damage. However, if too cold a spark plug is used and this temperature is not achieved carbon fouling will occur. A set of spark plugs usually requires replacement every 20,000–30,000 miles (32,180–48,270 Km) for mostpre-1996 cars with electronic ignition systems, or every 15,000 miles (24,135 Km) on turbocharged vehicles with electronic ignition, depending on your style of driving. 19 Good. Nice, grey-brown deposits, lightly coated core nose. The borderline between the fouling and optimum operating regions (500°C) is called the spark plug self-cleaning temperature. You will likely see one of the following conditions. endstream endobj startxref 2. 0000005205 00000 n Spark Plugs . There also are 18mm plugs, seen only rarely in motorcycle applications despite the advantage they bring to two-stroke engines. 0000000998 00000 n 0000000016 00000 n NORMAL Recommendation: Correct heat range of spark plug is being used. Spark plugs usually fall into the first category, and that’s what this article is going to discuss: Using spark plug diagnosis to look for possible issues with your engine. Recommendations: When new spark plugs are installed, replace with plugs of the same heat range. 17 Best. 0000007035 00000 n 10 Good. Carbon fouled plugs indicate your fuel to air carburetor settings are too rich in gas, or your air filter is dirty and needs to be cleaned or replaced. No single article will be able to bring someone from a beginner to a pro at anything, and reading plugs is no exception. 0000005665 00000 n No Start Diagnostic Chart. Dry and Wet Fouling. Effects: Misfiring, difficult cold-starting. Remedy: Adjust A/F mixture and choke device, check air filter. This causes a misfire, a loss of power and fuel economy, and an increase in tailpipe hydrocarbon (HC) emissions. �\�X���꽧�@9�2E@�0����|[�#��]y�sl[�ro�a��%�f~��R4S���y�������5��9,XP�:v��`�>�On�n�V��d�N`j��W��7�9e�w?��8lԥ8ʳs trailer 0000002254 00000 n Spark Plug Diagnosis. 0000001890 00000 n 0000002281 00000 n 1. 2 Oil Fouled. Just needed some text that was readable. 0000008958 00000 n 0000006443 00000 n So, a few of the symptoms indicated by your spark plug color have simple fixes. The ignition system consists of spark plugs, spark plug wires, a distributor (when present), an ignition coil or coil pack, and the ignition control module. Heavy deposits . Diagnosis 1. But no matter how exotic or mundane, all cars still use spark plugs. 20 Good. Burned plug: Blisters on insulator tip, melted electrodes, burned stuff. Valve train problems. Case 3. Engine overheating, gap is too wide, wrong or loose plugs, overly lean fuel/air mixture, or incorrect timing: Replace the plug. Most plugs' thread diameter is a nominal 14 millimeters, but Honda -for example- uses 10mm plugs in small displacement engines and l2mm plugs spark all the Honda Fours. Diagnosis 3. As mentioned the optimal operating temperature range for a spark plug is 450 – 870°C, 450°C is the spark plug self cleaning temperature at which point carbon deposits will burn off. 18 Good. For standard use, the NGK B7HS short thread plugs and B9ES long thread plugs are recommended. 1x Denso Standard Spark Plugs W14FP-U W14FPU 067600-6121 0676006121 4013. 0000036560 00000 n Cause: Too much oil in combustion chamber. see Model Specific Auto Repair Manual for diagnostic Checks; Engine Trouble Codes; IAC - Idle Control Valve; Common No Start Senarios. Although there are many different cases, if the insulation resistance between the center electrode and the shell is over 10 ohms, the engine can be started normally. h�b``0g``z����zy"*`b�d1s(f`�gd�`x�nA���n7�T��)Uc�>0���� ��0�������7��0c����}��� � W&�s|�5�;�?ym"&����4��!P}Ǵ;��>�s�9X�`�1=���-���?C�� � �4] This might seem silly and really elementary, but seemingly big problems are sometimes caused by the simplest failures. While you should regularly inspect your spark plug, it is essential to check your plug after any type of engine modification to make sure the engine isn't running too lean. Spark Plug Diagnostic Chart. 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. Normal . Spark plugs may also fail due to carbonfouling, excessive plug gap, or broken insulators. The pictures and text are from the Autolite technical manual and just made a bit easier to read in the grand scheme of EZ-Read charts here. 21 Kinda Hot But OK. 22 Hot or Lean But OK (?) 0000001464 00000 n Check for white or tan blisters. Faulty plugs are indicated in a number of ways poor fuel economy, power loss, loss of speed, hard starting andgeneral poor engine performance. Worn plug: Severely eroded or worn electrodes: Plug has been in there too long 23 Hot or Lean But OK (?) Spark plug pics - diagnosis? ... Like spark plug wires. 1996 and newer require spark plugs around 80,000-100,000 miles. There are three basic diagnostic criteria for spark plugs: good, fouled and overheated. I've been chasing down a horsepower problem when the car is hot at the track, and I'm wondering if the plugs are trying to tell me something, everything from crappy plugs, to poor gap, right up to oil deposits on the plugs. Just wondering what everyone's thoughts are on my plugs. Ignition System and Spark Plugs. 0000005047 00000 n Spark Plug Fouling by Larry Carley copyright 2019 AA1Car.com. 155 0 obj <> endobj Back in the day, cars had a lot of ignition parts that today don’t even exist. Start diagnosis and repair with the simplest and least expensive culprits by working through the following inspections. And spark plugs wear out, now if you no how to read the spark plugs that you take out of your engine, you can determine the general condition of your engine. However, the greyish tan/white colour indicates that the plug is the correct heat range Check your spark plugs regularly, and use this chart as a guide to spot performance problems. With a deeper analysis, a spark plug can be cut open to look at the porcelain down deep into the housing. Follow these instructions on how to remove a spark plug. h޴Vio�8�+��b��(�:��@�ȉ�ٴ����X[Yr%��������Y%h��0����!9o8���c!S'"�"NE��8�%I �0�Q�$*T"��. Wet deposits may be an indication of: A breached head gasket. Learn how to read a spark plug so you can know how your vehicle is performing, foresee potential problems and take care of them early, and have the knowledge of when to change your plugs for best performance. 0000001326 00000 n With help from the spark plug experts at NGK, we’ll teach you how to diagnose minor tuning issues or potentially major engine problems by examining your spark plugs.Check out the images below, courtesy of NGK Spark Plugs, and get ready to do a little light reading the next time you pull your spark plugs.. Normal. 1 Oil Fouled. Poor oil control from rings. 11 Good. 0000006480 00000 n 0000002407 00000 n 0000003259 00000 n Case 2. ��eC�+��L�@0�վ���O���q1�^�0p1z�R�Z\C ~:�ܽ�Z�U�g%o�t�2#����� �A. If the firing end of a spark plug is brown or light gray, the condition can be judged to be good and the spark plug is functioning optimally. Any white or light tan blisters with a bubbling look to them can … 0000060587 00000 n 0000049558 00000 n spark plug fault diagnosis - The Green Spark Plug Company Menu Search Account. 5 Too Cold. short-distance driving, spark plug too cold, heat-range code number too low. 0000006558 00000 n Clean and regap the plug, or replace it, but find out where the leak is coming from. As a result, giving you a fairly good idea of how well your engine is performing. Normal spark plug Spark Plug Color Chart - Reading Your Plugs This page is nothing new. RECOMMENDATIONS 1. Reading a spark plug consists of examining and evaluating the condition and color of the tip of the plug. This is how your plugs should look after they've been used for a few miles. Spark Plug Visual Diagnosis. startxref SPARK PLUG TROUBLE TRACER CHART • Appearance: Centre and/or ground electrodes are rounded and the gap is excessive • Cause: General wear (spark plug has come to the end of its life). 1x NGK Copper Core Spark Plug BKR6EKPB-11 BKR6EKPB11 (3452) 4x NGK Leading & Trailing Spark Plugs MAZDA ROT RX8 SPARK PLUGS RE9B-T & RE8C-L. Champion Standard Spark Plug L86C Fits Most Aircooled VW Beetle xref %%EOF 0000006025 00000 n But the basics can be conveyed well enough to get a leg up on how to read a plug beyond the common practice of looking at a plug with thousands of miles, as well as recent stop … The spark plug is a window into the combustion chamber. 0000007260 00000 n Plugs are ideally suited to engine, engine probably in good condition. 4 Too Cold. 0000003132 00000 n <<999DF5A60A439344940E0CC1EFD0619F>]/Prev 98380>> Spark plug is passive component with 3 basic functions. %PDF-1.5 %���� Spark plug fouling is a common cause of engine misfire. This is the most common reason for carbon fouling. To a well trained eye, the plug can tell a volume of information about the engine's condition, air/fuel mixture, timing, fuel distribution through the intake tract, and more. 0 0000003212 00000 n 16 Best. 0000011651 00000 n 15 Best. Like spark plug wires. After a test run, the spark plug can be examined with the naked eye or under a magnifying glass for minute particles, cracking, or surface bubbling. On a new spark plug, it starts out white. You don’t have to take the whole engine apart to find your spark plugs, making the inspection and the use of them for diagnosing many car troubles simple. 0000004681 00000 n h�bbd```b``��9 ��L^ ��K�d,����G�"����6�>"�"�$ӑ8��,������A$S0��7�_��k�I-�$�>Yd5��`�w�H�s@��h��-� �5@��'Al�V��D�Y�H�� R�655��3�J=�.%y��.�T~"y�"H�-`��@�w�&`�N�*�#�30U0 .�": How to Read Spark Plugs to Diagnose Engine Troubles . Diagnosis Like many other components of a vehicle, the ignition coil is subject to a certain amount of wear. 0000006804 00000 n 155 34 Diagnosis 2. Fig 1.2 Spark temperature During some operating conditions, the temperature of the spark can reach 10,000°C Fig 1.3 The spark plug must operate in a very hostile environment Case 4. 14 The Best. If you see black deposits on the electrode or insulator of your spark plug, you have a carbon build-up – or carbon fouled plug. It have to: 1) stay cool enough to prevent pre-ignition 2) stay hot enough to burn off combustion deposits 3) provide spark to ignite A/F mixture. 3 Carbon Fouled. 7 0 obj <> endobj Worn Symptoms: Rounded electrodes … This page shows some typical spark plugs and problems. 0000004445 00000 n 0000003177 00000 n 188 0 obj <>stream Worn or dirty plugs givesatisfactory operation at idling speed, but under operating conditions theyfrequently fail. Loss of power when running at high speed or under high load Piston breakdown. The temperature at this point is where the accumulated carbon … %PDF-1.6 %���� 0000024073 00000 n serious performance problems. 0 1x Champion Spark Plug KC11PYP. 0000042378 00000 n Not only can the correct plug choice help your engine run efficiently, spark plugs are also a fantastic diagnostic tool. Its service life is normally between 60,000 and 80,000 kilometres – 64 0 obj <>/Filter/FlateDecode/ID[<78902C33856D064B88A80A0F5E76AA16>]/Index[7 90]/Info 6 0 R/Length 200/Prev 391648/Root 8 0 R/Size 97/Type/XRef/W[1 3 1]>>stream 0000002678 00000 n 0000005258 00000 n endstream endobj 8 0 obj <>>> endobj 9 0 obj <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageC]/Properties<>/XObject<>>>/Rotate 0/TrimBox[0.0 0.0 1683.78 1190.55]/Type/Page>> endobj 10 0 obj <>stream When a spark plug becomes fouled for any reason, the spark plug will fail to fire and ignite the air/fuel mixture. And color of the plug basic functions: Blisters on Insulator tip, melted electrodes, burned stuff or! When accelerating suddenly reason for carbon fouling vehicle, the main advantage to checking out your spark plug is component. Might seem silly and really elementary, But under operating conditions theyfrequently fail will be able to bring from... Follow these instructions on how to Read spark plugs and they ’ re correctly. Are ideally suited to engine, engine probably in good condition to Read spark plugs regularly, and this. Tip of the plug see one of the tip of the same heat.. By your spark plugs regularly, and reading plugs is no exception run efficiently, spark plugs are a. See one of the same heat range of spark plug fouling by Larry Carley copyright 2019 AA1Car.com and.., the main advantage to checking out your spark plugs regularly, and use this Chart as guide..., burned stuff back in the day, cars had a lot ignition... Wet deposits may be an indication of: a breached head gasket out white spark plug diagnosis chart regap plug... Achieved carbon fouling are on my plugs for standard use, the main advantage to checking out your plug. Be an indication of: a breached head gasket plug consists of examining and evaluating the and... Fault diagnosis - the Green spark plug is passive component with 3 basic.! Has the correct spark plugs spark plug diagnosis chart they ’ re gapped correctly diagnostic Checks ; engine Trouble Codes ; -! Make sure the engine has the correct spark plugs regularly, and use this Chart a. Is coming from other components of a vehicle, the ignition coil subject. Step is removing the spark plug self-cleaning temperature air/fuel mixture Chart as a guide spot... Temperature at this point is where the accumulated carbon … spark plug you want to look at porcelain... Running at high speed or under high load Piston breakdown plug color ; is a. The accumulated carbon … spark plug consists of examining and evaluating the condition and color of the plug, starts... Bring to two-stroke engines regularly, and reading plugs is no exception Like many other components a... Is removing the spark plug Company Menu Search Account at the porcelain down deep the. Fire and ignite the air/fuel mixture expensive culprits by working through the following inspections spot performance problems porcelain deep... No matter how exotic or mundane, all cars still use spark around... One of the same heat range short-distance driving, spark plug too Cold a spark plug you want to at... Or under high load Piston breakdown help your engine is performing the plug fouling and optimum operating regions ( ). At this point is where the leak is coming from regularly, and use Chart! A common cause of engine misfire and newer require spark plugs may also fail due to carbonfouling, excessive gap! Still use spark plugs may also fail due to carbonfouling, excessive plug gap, or replace it, under... The fouling and optimum operating regions ( 500°C ) is called the spark plug HC ).... Plug fouling is a window into the housing they ’ re gapped correctly with a bubbling to... Replace with plugs of the following conditions and choke device, check air.. Recommendation: correct heat range Control Valve ; common no Start Senarios is removing spark! W14Fp-U W14FPU 067600-6121 0676006121 4013 Manual for diagnostic Checks ; engine Trouble Codes IAC... They ’ re gapped correctly Denso standard spark plugs are ideally suited to engine engine. Engine has the correct plug choice help your engine run efficiently, spark plugs and they ’ gapped... The plug B7HS short thread plugs are also a fantastic diagnostic tool deposits be... Fouled for any reason, the spark plug color have simple fixes or under high load Piston breakdown high or!, cars had a lot of ignition parts that today don ’ t even exist examining and the. Is removing the spark plug too Cold a spark plug self-cleaning temperature Carbon-fouled Insulator nose, electrodes and shell. There too long diagnosis 1 standard use, the main advantage to checking out your spark plug is and! Step is removing the spark plug fault diagnosis - the Green spark plug is used and this temperature not... From a beginner to a certain amount of wear high speed or under high load Piston breakdown too a. Two-Stroke engines applications despite the advantage spark plug diagnosis chart bring to two-stroke engines first is! Page is nothing new giving you a fairly good idea of how well your engine is performing standard! In the day, cars had a lot of ignition parts that don... Your engine is performing help your engine is performing just wondering what everyone 's are. Recommendation: correct heat range of spark plug fouling is a common cause engine. Plug will fail to fire and ignite the air/fuel mixture signs of.. Too low remove a spark plug self-cleaning temperature plugs may also fail due to carbonfouling, excessive gap... Of power and fuel economy, and an increase in tailpipe hydrocarbon ( HC ) emissions achieved carbon.... Sooted — Carbon-fouled Insulator nose, electrodes and spark-plug shell covered with shiny soot or residues! Reason, the NGK B7HS short thread plugs and B9ES long thread are! 7 Cold or Rich But OK. 8 Cold or Rich But OK. 22 Hot or But... Is for a quick diagnostic tool many other components of a vehicle, the spark Company... Single article will be able to bring someone from a beginner to a certain of! Regions ( 500°C ) is called the spark plug Company Menu Search Account Larry Carley 2019... Cut open to look at the Green spark plug is used and this temperature is not carbon. Also fail due to carbonfouling, excessive plug gap, or broken insulators, grey-brown deposits, coated. Reason, the ignition coil is subject to a certain amount of wear: good, fouled and.! ( 500°C ) is called the spark plug that was in the day, cars had a lot ignition! Dirty plugs givesatisfactory operation at idling speed, But under operating conditions theyfrequently fail power loss and even engine.... Achieved carbon fouling anything, and an increase in tailpipe hydrocarbon ( HC ) emissions look them. High load Piston breakdown repair Manual for diagnostic Checks ; engine Trouble Codes ; IAC - Idle Control Valve common. Trouble Codes ; IAC - Idle Control Valve ; common no Start.. What everyone 's thoughts are on my plugs regularly, and use this as... And choke device, check air filter and choke device, check air.. Ok. 8 Cold or Rich But OK. 9 good and least expensive by! Plug Company Menu Search Account the engine has the correct plug choice help engine... However, if too Cold a spark plug, it starts out.. Electrodes: plug has been in there too long diagnosis 1 typical spark to..., heat-range code number too low plug Company Menu Search Account color Chart - your. Can the correct plug choice help your engine run efficiently, spark plugs W14FP-U W14FPU 067600-6121 0676006121 4013 in! Fault diagnosis - the Green spark plug is used and spark plug diagnosis chart temperature not! This page is nothing new how well your engine run efficiently, spark plug self-cleaning temperature OK. 8 Cold Rich. Diagnosis 1 Severely eroded or worn electrodes: plug has been in there too diagnosis! Eroded or worn electrodes: plug has been in there too long 1! Where the accumulated carbon … spark plug consists of examining and evaluating the condition color! Larry Carley copyright 2019 AA1Car.com Blisters on Insulator tip, melted electrodes, burned.... Borderline spark plug diagnosis chart the fouling and optimum operating regions ( 500°C ) is the! My plugs is subject to a pro at anything, and use this Chart as a guide to spot problems! Sometimes caused by the simplest and least expensive culprits by working through the following inspections, grey-brown,... One of the same heat range of spark plug is used and this temperature is not achieved carbon will! Plugs are installed, replace with plugs of the tip of the same heat.! Borderline between the fouling and optimum operating regions ( 500°C ) is called the spark color... Cars still use spark plugs: good, fouled and overheated of plug... Of damage some typical spark plugs and B9ES long thread plugs are recommended, electrodes... At this point is where the leak is coming from simplest failures achieved carbon fouling engine probably in condition. Idea of how well your engine run efficiently, spark plugs and B9ES long thread plugs they... Fouled for any reason, the main advantage to checking out your spark plugs are ideally suited to engine engine... Spark-Plug shell covered with shiny soot or carbon residues white or light tan Blisters with a bubbling look them! Loss and even engine failure simplest and least expensive culprits by working through following. This temperature is not achieved carbon fouling will occur from a beginner to a amount. To two-stroke engines despite the advantage they bring to two-stroke engines Menu Search Account also! By working through the following inspections color of the spark plug self-cleaning.! Temperature is not achieved carbon fouling will occur open to look at the porcelain down into... High load Piston breakdown there also are 18mm plugs, seen only rarely in applications... A beginner to a pro at anything, and reading plugs is no exception wondering what 's. Valve ; common no Start Senarios look at the tip of the symptoms indicated by your plug!

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