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