Case 2. Spark plug is passive component with 3 basic functions. 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. Just wondering what everyone's thoughts are on my plugs. 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). There are three basic diagnostic criteria for spark plugs: good, fouled and overheated. 0000002281 00000 n Burned plug: Blisters on insulator tip, melted electrodes, burned stuff. serious performance problems. Look at end of the spark plug that was in the cylinder and examine it. This causes a misfire, a loss of power and fuel economy, and an increase in tailpipe hydrocarbon (HC) emissions. 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. Dry and Wet Fouling. Worn plug: Severely eroded or worn electrodes: Plug has been in there too long On a new spark plug, it starts out white. 0000006804 00000 n 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. 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. 0000003177 00000 n 11 Good. Follow these instructions on how to remove a spark plug. Make sure the engine has the correct spark plugs and they’re gapped correctly. 0000049558 00000 n There also are 18mm plugs, seen only rarely in motorcycle applications despite the advantage they bring to two-stroke engines. Diagnosis 2. �\�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 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 .�": 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 Worn Symptoms: Rounded electrodes … Sooted — Carbon-fouled Insulator nose, electrodes and spark-plug shell covered with shiny soot or carbon residues. 13 Real Good. Normal spark plug 188 0 obj <>stream Case 4. This might seem silly and really elementary, but seemingly big problems are sometimes caused by the simplest failures. Just needed some text that was readable. Spark Plug Visual Diagnosis. However, the greyish tan/white colour indicates that the plug is the correct heat range 0 %PDF-1.6 %���� 0000003132 00000 n 1x Champion Spark Plug KC11PYP. 0000005665 00000 n 0000002678 00000 n Nice, grey-brown deposits, lightly coated core nose. When a spark plug becomes fouled for any reason, the spark plug will fail to fire and ignite the air/fuel mixture. 3 Carbon Fouled. If you see black deposits on the electrode or insulator of your spark plug, you have a carbon build-up – or carbon fouled plug. 96 0 obj <>stream Loss of power when running at high speed or under high load Piston breakdown. 7 0 obj <> endobj 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 … 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. No Start Diagnostic Chart. NORMAL Recommendation: Correct heat range of spark plug is being used. Its service life is normally between 60,000 and 80,000 kilometres – 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. Back in the day, cars had a lot of ignition parts that today don’t even exist. 0000005205 00000 n 0000024073 00000 n 0000006480 00000 n Spark Plug Diagnostic Chart. 0000005258 00000 n Misfiring only when running at high speed or when accelerating suddenly. 0000000998 00000 n 2. 14 The Best. So, a few of the symptoms indicated by your spark plug color have simple fixes. How to Read Spark Plugs to Diagnose Engine Troubles . 0000008958 00000 n 0000003212 00000 n Recommendations: When new spark plugs are installed, replace with plugs of the same heat range. Any white or light tan blisters with a bubbling look to them can … As a result, giving you a fairly good idea of how well your engine is performing. Valve train problems. 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. by Pat Goss. Remedy: Adjust A/F mixture and choke device, check air filter. 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. 0000006558 00000 n 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. see Model Specific Auto Repair Manual for diagnostic Checks; Engine Trouble Codes; IAC - Idle Control Valve; Common No Start Senarios. endstream endobj startxref 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] 0000002254 00000 n For standard use, the NGK B7HS short thread plugs and B9ES long thread plugs are recommended. 0000001759 00000 n 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. 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. 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. 6 Cold or Rich But OK. 7 Cold or Rich But OK. 8 Cold or Rich But OK. 9 Good. 0000011651 00000 n RECOMMENDATIONS 1. 5 Too Cold. But no matter how exotic or mundane, all cars still use spark plugs. Check for white or tan blisters. 0000001326 00000 n 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. <<999DF5A60A439344940E0CC1EFD0619F>]/Prev 98380>> Clean and regap the plug, or replace it, but find out where the leak is coming from. This page shows some typical spark plugs and problems. 21 Kinda Hot But OK. 22 Hot or Lean But OK (?) 17 Best. 1x Denso Standard Spark Plugs W14FP-U W14FPU 067600-6121 0676006121 4013. 2 Oil Fouled. No single article will be able to bring someone from a beginner to a pro at anything, and reading plugs is no exception. ... Like spark plug wires. You will likely see one of the following conditions. 19 Good. 4 Too Cold. 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. 0000007260 00000 n 0000006443 00000 n However, if too cold a spark plug is used and this temperature is not achieved carbon fouling will occur. Reading a spark plug consists of examining and evaluating the condition and color of the tip of the plug. Case 3. Worn or dirty plugs givesatisfactory operation at idling speed, but under operating conditions theyfrequently fail. trailer Trouble other than with the engine. Bad plugs can cause overheating, rough running, power loss and even engine failure. 1 Oil Fouled. Like spark plug wires. The spark plug is a window into the combustion chamber. 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. 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 %%EOF %%EOF Spark plug fouling is a common cause of engine misfire. 20 Good. Engine overheating, gap is too wide, wrong or loose plugs, overly lean fuel/air mixture, or incorrect timing: Replace the plug. 0000004445 00000 n 0000007035 00000 n short-distance driving, spark plug too cold, heat-range code number too low. The temperature at this point is where the accumulated carbon … %PDF-1.5 %���� 0000006025 00000 n Take the spark plug in your hand and begin looking at it for signs of damage. 18 Good. 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 h޴Vio�8�+��b��(�:��@�ȉ�ٴ����X[Yr%��������Y%h��0����!9o8���c!S'"�"NE��8�%I �0�Q�$*T"��. Check your spark plugs regularly, and use this chart as a guide to spot performance problems. Spark Plug Color Chart - Reading Your Plugs This page is nothing new. ��eC�+��L�@0�վ���O���q1�^�0p1z�R�Z\C ~:�ܽ�Z�U�g%o�t�2#����� �A. Cause: Too much oil in combustion chamber. 0000001890 00000 n Effects: Misfiring, difficult cold-starting. 155 34 Heavy deposits . startxref 15 Best. The first step is removing the spark plug you want to look at. Diagnosis Like many other components of a vehicle, the ignition coil is subject to a certain amount of wear. Spark Plug Diagnosis. 0000060587 00000 n Start diagnosis and repair with the simplest and least expensive culprits by working through the following inspections. 23 Hot or Lean But OK (?) 10 Good. spark plug fault diagnosis - The Green Spark Plug Company Menu Search Account. Faulty plugs are indicated in a number of ways poor fuel economy, power loss, loss of speed, hard starting andgeneral poor engine performance. Poor oil control from rings. With a deeper analysis, a spark plug can be cut open to look at the porcelain down deep into the housing. 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. 16 Best. 0000042378 00000 n Ignition System and Spark Plugs. 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. Normal . 1996 and newer require spark plugs around 80,000-100,000 miles. Spark Plugs . 0000002407 00000 n 0000036560 00000 n Diagnosis 3. Diagnosis 1. Also, the main advantage to checking out your spark plug color; is for a quick diagnostic tool. 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. This is how your plugs should look after they've been used for a few miles. 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 Plugs are ideally suited to engine, engine probably in good condition. 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. 0000004681 00000 n Not only can the correct plug choice help your engine run efficiently, spark plugs are also a fantastic diagnostic tool. 0 Spark plugs may also fail due to carbonfouling, excessive plug gap, or broken insulators. This is the most common reason for carbon fouling. 0000001464 00000 n 0000003259 00000 n 155 0 obj <> endobj 0000000016 00000 n Wet deposits may be an indication of: A breached head gasket. The borderline between the fouling and optimum operating regions (500°C) is called the spark plug self-cleaning temperature. 12 Good. xref Spark plug pics - diagnosis? 0000005047 00000 n Spark Plug Fouling by Larry Carley copyright 2019 AA1Car.com. 1. Regularly, and use this Chart as a guide to spot performance problems bring. 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