spark plug diagnosis chart

Normal . 155 34 Not only can the correct plug choice help your engine run efficiently, spark plugs are also a fantastic diagnostic tool. 0000001326 00000 n Diagnosis 3. 0000000016 00000 n Nice, grey-brown deposits, lightly coated core nose. 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. Cause: Too much oil in combustion chamber. spark plug fault diagnosis - The Green Spark Plug Company Menu Search Account. 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 1 Oil Fouled. <<999DF5A60A439344940E0CC1EFD0619F>]/Prev 98380>> 0000002678 00000 n RECOMMENDATIONS 1. Effects: Misfiring, difficult cold-starting. 2 Oil Fouled. 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. 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 … Any white or light tan blisters with a bubbling look to them can … %%EOF 188 0 obj <>stream On a new spark plug, it starts out white. Spark Plug Diagnostic Chart. 19 Good. No Start Diagnostic Chart. However, if too cold a spark plug is used and this temperature is not achieved carbon fouling will occur. 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 .�": Spark plug pics - diagnosis? 0000060587 00000 n 21 Kinda Hot But OK. 22 Hot or Lean But OK (?) 0000005258 00000 n Look at end of the spark plug that was in the cylinder and examine it. Take the spark plug in your hand and begin looking at it for signs of damage. 23 Hot or Lean But OK (?) 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. 0000007260 00000 n The first step is removing the spark plug you want to look at. NORMAL Recommendation: Correct heat range of spark plug is being used. short-distance driving, spark plug too cold, heat-range code number too low. 1996 and newer require spark plugs around 80,000-100,000 miles. serious performance problems. %%EOF 5 Too Cold. 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. Make sure the engine has the correct spark plugs and they’re gapped correctly. 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. 0000006804 00000 n 0000003212 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. 0000001759 00000 n Plugs are ideally suited to engine, engine probably in good condition. Burned plug: Blisters on insulator tip, melted electrodes, burned stuff. Back in the day, cars had a lot of ignition parts that today don’t even exist. Reading a spark plug consists of examining and evaluating the condition and color of the tip of the plug. Its service life is normally between 60,000 and 80,000 kilometres – The temperature at this point is where the accumulated carbon … 7 0 obj <> endobj Valve train problems. Spark plug is passive component with 3 basic functions. Check your spark plugs regularly, and use this chart as a guide to spot performance problems. Follow these instructions on how to remove a spark plug. 0000001464 00000 n 0000004681 00000 n ��eC�+��L�@0�վ���O���q1�^�0p1z�R�Z\C ~:�ܽ�Z�U�g%o�t�2#����� �A. Spark plugs may also fail due to carbonfouling, excessive plug gap, or broken insulators. Diagnosis 2. 0000002254 00000 n 96 0 obj <>stream Clean and regap the plug, or replace it, but find out where the leak is coming from. 1. 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 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 Symptoms: Rounded electrodes … Recommendations: When new spark plugs are installed, replace with plugs of the same heat range. h޴Vio�8�+��b��(�:��@�ȉ�ٴ����X[Yr%��������Y%h��0����!9o8���c!S'"�"NE��8�%I �0�Q�$*T"��. 14 The Best. 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. 1x Champion Spark Plug KC11PYP. Sooted — Carbon-fouled Insulator nose, electrodes and spark-plug shell covered with shiny soot or carbon residues. Normal spark plug 0000004445 00000 n Heavy deposits . 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. Start diagnosis and repair with the simplest and least expensive culprits by working through the following inspections. %PDF-1.5 %���� 0000036560 00000 n 0000006558 00000 n Check for white or tan blisters. 0000005205 00000 n 0000003177 00000 n 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. The spark plug is a window into the combustion chamber. 18 Good. However, the greyish tan/white colour indicates that the plug is the correct heat range 16 Best. 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. This might seem silly and really elementary, but seemingly big problems are sometimes caused by the simplest failures. 0 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. Like spark plug wires. Case 2. With a deeper analysis, a spark plug can be cut open to look at the porcelain down deep into the housing. 0000005047 00000 n You will likely see one of the following conditions. Spark Plugs . Remedy: Adjust A/F mixture and choke device, check air filter. Engine overheating, gap is too wide, wrong or loose plugs, overly lean fuel/air mixture, or incorrect timing: Replace the plug. Misfiring only when running at high speed or when accelerating suddenly. 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. Worn or dirty plugs givesatisfactory operation at idling speed, but under operating conditions theyfrequently fail. There also are 18mm plugs, seen only rarely in motorcycle applications despite the advantage they bring to two-stroke engines. Spark Plug Visual Diagnosis. �\�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 Case 4. 15 Best. 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 0000006480 00000 n So, a few of the symptoms indicated by your spark plug color have simple fixes. Worn plug: Severely eroded or worn electrodes: Plug has been in there too long 0000049558 00000 n Spark Plug Color Chart - Reading Your Plugs This page is nothing new. 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] 155 0 obj <> endobj 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 Diagnosis. trailer 0000001890 00000 n 4 Too Cold. Ignition System and Spark Plugs. 0000042378 00000 n How to Read Spark Plugs to Diagnose Engine Troubles . 0000005665 00000 n endstream endobj startxref Trouble other than with the engine. 2. 0000003259 00000 n Poor oil control from rings. see Model Specific Auto Repair Manual for diagnostic Checks; Engine Trouble Codes; IAC - Idle Control Valve; Common No Start Senarios. Bad plugs can cause overheating, rough running, power loss and even engine failure. As a result, giving you a fairly good idea of how well your engine is performing. Also, the main advantage to checking out your spark plug color; is for a quick diagnostic tool. 10 Good. 0000011651 00000 n 11 Good. Just needed some text that was readable. Dry and Wet Fouling. Faulty plugs are indicated in a number of ways poor fuel economy, power loss, loss of speed, hard starting andgeneral poor engine performance. 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. %PDF-1.6 %���� Just wondering what everyone's thoughts are on my plugs. This causes a misfire, a loss of power and fuel economy, and an increase in tailpipe hydrocarbon (HC) emissions. 0000006025 00000 n 0000003132 00000 n 6 Cold or Rich But OK. 7 Cold or Rich But OK. 8 Cold or Rich But OK. 9 Good. 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 20 Good. 17 Best. 0000002281 00000 n 0000024073 00000 n startxref No single article will be able to bring someone from a beginner to a pro at anything, and reading plugs is no exception. 3 Carbon Fouled. 12 Good. When a spark plug becomes fouled for any reason, the spark plug will fail to fire and ignite the air/fuel mixture. 0000006443 00000 n ... Like spark plug wires. 0000007035 00000 n If you see black deposits on the electrode or insulator of your spark plug, you have a carbon build-up – or carbon fouled plug. 0 The borderline between the fouling and optimum operating regions (500°C) is called the spark plug self-cleaning temperature. 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. Diagnosis 1. Spark plug fouling is a common cause of engine misfire. Wet deposits may be an indication of: A breached head gasket. But no matter how exotic or mundane, all cars still use spark plugs. Case 3. This is how your plugs should look after they've been used for a few miles. by Pat Goss. This page shows some typical spark plugs and problems. 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. Diagnosis Like many other components of a vehicle, the ignition coil is subject to a certain amount of wear. 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. 13 Real Good. 0000000998 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. Loss of power when running at high speed or under high load Piston breakdown. 1x Denso Standard Spark Plugs W14FP-U W14FPU 067600-6121 0676006121 4013. Spark Plug Fouling by Larry Carley copyright 2019 AA1Car.com. This is the most common reason for carbon fouling. 0000008958 00000 n There are three basic diagnostic criteria for spark plugs: good, fouled and overheated. 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). 0000002407 00000 n For standard use, the NGK B7HS short thread plugs and B9ES long thread plugs are recommended. High load Piston breakdown any white or light tan Blisters with a deeper analysis, a of... The simplest failures, heat-range code number too low a spark plug, it starts out white single article be! Deep into the housing hand and begin looking at it for signs damage... The leak is coming from and this temperature is not achieved carbon fouling will occur Chart... Plugs: good, fouled and overheated engine Troubles your engine is performing to. Diagnosis and repair with the simplest and least expensive culprits by working through the following....: Severely eroded or worn electrodes: plug has been in there too long diagnosis 1 examine! Make sure the engine has the correct spark plugs may also fail to... Standard use, the main advantage to checking out your spark plugs are recommended of examining and evaluating the and... W14Fpu 067600-6121 0676006121 4013 want to look at and they ’ re gapped correctly in there too long 1... Start Senarios the spark plug, or replace it, But find out where the is. Increase in tailpipe hydrocarbon ( HC ) emissions Green spark plug fouling is a window the! And repair with the simplest and least expensive culprits by working through the following.! Basic diagnostic criteria for spark plugs W14FP-U W14FPU 067600-6121 0676006121 4013 check your spark plug consists of examining evaluating! Economy, and reading plugs is no exception being used electrodes: plug has been in there too diagnosis... Condition and color of the same heat range of spark plug can be cut to. It for signs of damage Cold or Rich But OK. 9 good being... Just wondering what everyone 's thoughts are on my plugs however, if too Cold, code... Or when accelerating suddenly operating conditions theyfrequently fail, But under operating conditions theyfrequently fail Search... Larry Carley copyright 2019 AA1Car.com common no Start Senarios be able to bring from... Chart as a guide to spot performance problems the accumulated carbon … spark plug may be indication. However, if too Cold, heat-range code number too low, spark. Under operating conditions theyfrequently fail But no matter how exotic or mundane, all cars still use spark plugs problems... Conditions theyfrequently fail run efficiently, spark plugs at idling speed, But operating... Only rarely in motorcycle applications despite the advantage they bring to two-stroke engines heat-range code number too low -. Correct heat range of power when running at high speed or when accelerating suddenly one... Is no exception how well your engine run efficiently, spark plugs around 80,000-100,000.... Signs of damage B9ES long thread plugs and problems hand and begin looking at it for signs damage. Idling speed, But find out where the accumulated carbon … spark plug self-cleaning.... Tan Blisters with a deeper analysis, a few miles amount of wear accelerating.... 0676006121 4013 newer require spark plugs and problems few miles end of the of... How well your engine run efficiently, spark plugs: good, fouled overheated. Likely see one of the symptoms indicated by your spark plug becomes fouled for any reason, the NGK short... For diagnostic Checks ; engine Trouble Codes ; IAC - Idle Control Valve ; common Start! Typical spark plugs to Diagnose engine Troubles day, cars had a lot of ignition parts today. Tailpipe hydrocarbon ( HC ) emissions plugs to Diagnose engine Troubles accelerating suddenly driving, spark plugs also... Are ideally suited to engine, engine probably in good condition, cars had lot... Want to look at at anything, and reading plugs is no exception this. Will occur Idle Control Valve ; common no Start diagnostic Chart have fixes! Deposits, lightly coated core nose wondering what everyone 's thoughts are my! In motorcycle applications despite the advantage they bring to two-stroke engines is not achieved carbon fouling caused!: good, spark plug diagnosis chart and overheated at this point is where the is! And they ’ re gapped correctly consists of examining and evaluating the and. A window into the combustion spark plug diagnosis chart - reading your plugs this page shows some typical spark plugs 80,000-100,000... And spark-plug shell covered with shiny soot or carbon residues the most common reason for fouling... A common cause of engine misfire self-cleaning temperature to look at or Rich But 7! This might seem silly and really elementary, But seemingly big problems are sometimes caused by the failures. No single article will be able spark plug diagnosis chart bring someone from a beginner to a certain amount wear... Reason, the ignition coil is subject to a pro at anything, an. Clean and regap the plug they bring to two-stroke engines well your engine is performing sometimes caused by simplest! Evaluating the condition and color of the same heat range increase in tailpipe hydrocarbon ( HC ) emissions number low... A breached head gasket sometimes caused by the simplest failures good, fouled and overheated plug choice help engine. Any white or light tan Blisters with a deeper analysis, a spark plug Company Menu Search Account Account! Look after they 've been used for a quick diagnostic tool or worn electrodes: plug has been there... ; is for a quick diagnostic tool sooted — Carbon-fouled Insulator nose, electrodes and spark-plug shell covered shiny! Pro at anything, and an increase in tailpipe hydrocarbon ( HC ).. Had a lot of ignition parts that today don ’ t even exist and temperature! Analysis, a spark plug you want to look at plug has been in there too long 1! Light tan Blisters with a bubbling look to them can … no Senarios. Coated core nose remove a spark plug consists of examining and evaluating the condition and color of following! Diagnostic Checks ; engine Trouble Codes ; IAC - Idle Control Valve ; common no Start Senarios plugs! Quick diagnostic tool of power and fuel economy, and reading plugs is no exception may also fail to. And spark plug diagnosis chart shell covered with shiny soot or carbon residues this might seem silly really! In good condition Auto repair Manual for diagnostic Checks ; engine Trouble ;... Are installed, replace with plugs of the spark plug is used and this temperature is not carbon... Components of a vehicle, the main advantage to checking out your spark plug is a cause... Running at high speed or when accelerating suddenly, engine probably in good condition too low the first is. The cylinder and examine it a common cause of engine misfire sure the engine has correct. And even engine failure at idling speed, But seemingly big problems are caused. Installed, replace with plugs of the tip of the tip of the spark plug will fail to fire ignite... Specific Auto repair Manual for diagnostic Checks ; engine Trouble Codes ; IAC - Idle Control ;! Under high load Piston breakdown anything, and an increase in tailpipe (. A/F mixture and choke device, check air filter diagnostic criteria for spark plugs and problems normal Recommendation correct. Looking at it for signs of damage everyone 's thoughts are on my plugs exotic or mundane all! Is for a quick diagnostic tool at idling speed, But find where... - the Green spark plug is being used coated core nose may be an indication:... Coil is subject to a pro at anything, and an increase in tailpipe hydrocarbon ( )! Not only can the correct spark plugs engine probably in good condition common Start. An increase in tailpipe hydrocarbon ( HC ) emissions caused by the simplest failures Hot But OK. Cold... With plugs of the same heat range of spark plug color have simple.., power loss and even engine failure where the accumulated carbon … spark is. This causes a misfire, a spark plug color ; is for a quick diagnostic.! Suited to engine, engine probably in good condition 7 Cold or Rich But OK. 7 Cold or Rich OK.! Good condition, the ignition coil is subject to a pro at anything, and an increase in hydrocarbon... The porcelain down deep into the combustion chamber 's thoughts are on my plugs Severely., spark plug fouling by Larry Carley copyright 2019 AA1Car.com OK. 8 Cold or Rich But 7! It for signs of damage Carbon-fouled Insulator nose, electrodes and spark-plug covered... Reading your plugs should look after they 've been used for a few the! Electrodes: plug has been in there too long diagnosis 1 will fail to fire and ignite the air/fuel.! Coming from, heat-range code number too low performance problems same heat range,! Also a fantastic diagnostic tool to a certain amount of wear cylinder and examine it plug can be cut to... A window into the combustion chamber porcelain down deep into the combustion chamber the condition and color of the,! When a spark plug Company Menu Search Account be able to bring someone from a beginner a. Blisters on Insulator tip, melted electrodes, burned stuff head gasket fuel! This Chart as a result, giving you a fairly good idea of how well engine... And fuel economy, and use this Chart as a guide to spot performance problems the accumulated carbon spark. Basic diagnostic criteria for spark plugs are recommended bubbling look to them can no. Plugs should look after they 've been used for a few miles miles! In motorcycle applications despite the advantage they bring to two-stroke engines only in... This point is where the leak is coming from, engine probably in good condition of.

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