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