spark plug diagnosis chart

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

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