Oil Fouled . Suspension . The firing end appearance also depends on the spark plug tip temperature. This is often caused by over advanced ignition, timing, poor engine cooling system efficiency, a very lean air/fuel mixture, or a leaking intake manifold. These usually look WET and smell of gasoline. No overheating. Pre-Ignition. As a result, giving the insulator tip a glazed or glossy appearance. Air/Fuel Mixtures seriously affect engine performance and spark plug operating temperatures. Frame number info Honda CT70; Frame number info Honda SS50; Frame number info Honda ST70; Frame number info Honda ST50 ; Frame number info Honda Z50A; Frame number info Honda CT90; Frame number info Honda C90; How to … Fortunately you only find leaded gas in racing these days, so if you suspect something like this just change the plugs. Distributorless ignition systems (DIS) require a crankshaft position sensor (CKP), and sometimes also a camshaft position sensor (CMP). Spark Plug Condition Chart . Type in the spark plug model you want replacement for. So, A resistance tester at room temperature will not detect this. This is how your plugs should look after they've been used for a few miles. Looking for our John Deere Spark Plug Cross Reference Chart. Clean and regap the plug, or replace it, but find out where the leak is coming from. Spark plug codes tell a lot of useful information about the spark plug, however, each spark plug manufacturer uses different codes. You sometimes see a very bright white electrode with black dots on it also as a heat range issue in some cases cracked electrodes. We have an extensive range of spark plugs, each with their own unique characteristics specifically engineered to its vehicle application and they are designed to suit a broad range of vehicles on Australian roads. Consequently, This is caused by too much lead in the fuel. Worn Symptoms: Rounded electrodes with a small amount of deposits of the firing end. Crankshaft – Camshaft […], The fuel pump relay is activated whenever the ignition is turned on. As mentioned I run Autolite Racing Plugs with cut back electrodes as well as NGK plugs. For your consideration, I have a Vintage 1966 Champion Spark Plug Application Chart for American & Imported Vehicles. If you are experiencing engine problems, taking a look at your spark plugs is a good place to start. #2. If you are the rightful owner of any of the pictures/wallpapers posted here, and you do not want it to be displayed or if you require a suitable credit, then please contact us and we will immediately do whatever is needed either for the image to be removed or provide credit where it is due. A clean, white insulator firing tip and/or excessive electrode erosion indicates this spark plug condition. A spark plug is an electrical device that fits into the cylinder head of some internal combustion engines and ignites compressed aerosol gasoline by means of an electric spark. Maintenance. The ignition or powertrain control module (PCM) usually controls […], The starter motor is what gets your engine running; when you turn the ignition key or push the start button. 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. Overheated . This however is a very rudimentary rule of thumb and is typically not used by professional mechanics to diagnose cars or ignition systems. The spark plug cannot create these conditions, but it must be able to cope with the levels of heat…if not, the performance will suffer and engine damage can occur. k This is often caused by over advanced ignition, timing, poor engine cooling system efficiency (scale, stoppages, low level), a very lean air/fuel mixture, or a leaking intake manifold. Tech Tips. So, The surface of the electrodes are also fretted and rough. A quick inspection can not only tell you if it’s time for spark plug replacement; but can speak volumes about your engines condition as well. This condition indicates that spark plug temperatures have risen suddenly; during a hard, fast acceleration period. The first way is to just unscrew it out of the engine and take a look at the end of it, matching the chart below. Good Spark Plug. It has the usual edge wear and writing in pencil on front. Note the brown to greyish tan color, and minimal amount of electrode erosion which clearly indicates the plug is in the correct heat range and has been operating in a "healthy" engine. Gear ratio - Honda C320S; Gear ratio - Honda C310S; Gear ratio - Honda TS50-----Honda piston size chart; Identification. Likely if you have a plug that looks like this a new plug is not going to fix the problem unless you just used the wrong plug length. Apr 26, 2016 - This Pin was discovered by Robert Peeples. Plugs are ideally suited to engine, engine probably in good condition. Burned. Self Cleaning Temperature. Knowing how to read spark plugs can help you identify potential engine-related malfunctions early on and save you expensive repairs. But, If the insulation resistance drops to 0 ohms; the firing end is fouled by either wet or dry carbon. Normal colour. Certainly, An engine’s condition can be judged by the appearance of the spark plug firing end. Wet, black, oily deposits on insulator tip and electrodes. Finally, Those formed at 370-470°C (700-790°F) having the greatest influence on lead resistance. VINTAGE ORIGINAL, 1973 CHAMPION SPARK PLUG RECOMMEDATION CHART. Also, This makes the electrode material (nickel alloy) weak and brittle. Cheep enough to change them often! We also share information about your use of our site with our advertising and analytics partners. AC Autolite Bosch Briggs and Stratton Champion Plug Denso John Deere Kohler NGK Plug Oregon Stens Tecumseh Torch Popular Applications; CS42S: 2974: WS8F-CJ7Y: W22MP-U--BPM7A: 77-300-1: 130-075-L7TC131-003: Husqvarna, Jonsered, Stihl, Solo-458, 404: … Search. MSD also recommends adjusting the gap no more than +/- 0.008” from the preset gap. Mixture setting and ignition timing are correct, no misfiring, cold-starting device functioning. In general, a light tan/gray color tells you that the spark plug is operating at optimum temperature; and that the engine is in good condition. #1. Yes, do get a new set of Autolite plugs. The second way is the same as #1 except you go for a really hard high revving ride on the bike, pull over and then unscrew each plug to read them. Content May NOT be used without written permission. Reading a spark plug correctly: (clickable chart) There are two different main ways to read a spark plug. Fuel Leak – If You Smell Fuel This Could Be A Sign Of A Fuel Leak, Interference Or Non Interference Engine – What Is The Real Difference, The function of the automatic shutdown (ASD) relay is to shut off power to major systems. Finally, resulting in abnormal gap growth. Brakes. 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. Read more. ACDelco Spark Plug. Too Cold. As a result, the spark plug is functioning optimally. COVERS EARLIER MODELS - ALL VEHICLES THAT TAKE SPARK PLUGS. Overly rich fuel/air mixture, dirty air filter, too much, Switch to “hotter” plug. How to Read Spark Plugs to Diagnose Engine Troubles. MSD spark plugs are pre-gapped and do not require gapping, there are instances where the gap requires modification. Broken electrodes. If there’s wet motor oil on the plug, it’s a sign of an oil leak, and if you notice any … Causes hard starting in … If you notice any black, dry soot on the spark plug, this is a sign of “carbon fouling,” which means your engine has been running too rich, and you should visit a mechanic to figure out the cause. A clean, white insulator firing tip and/or excessive electrode erosion indicates this spark plug condition. Finish. In general, a light tan/gray color tells you that the spark plug is operating at optimum temperature and that the engine is in good condition. MSD recommends a wire-style or feeler gauge gap tool, (Fig 1) which can adjust the gap without prying against the center electrode, (Figure 2). Depending on the type of the liquid present at the firing tip. The general rule of thumb is a bright blue spark is healthy, and a more orange looking spark is weaker. Spark Plug Color Charts. In race cars make sure you check the plug after a quick shut down. Cold or Rich But OK. Good Spark Plug. Exclude brandname in your query. Engine is in order. Here is an example of their basic spark plug code. Can a bad spark plug cause engine knock? Spark Plug Condition Identification Insulator nose grayish-white or grayish-yellow to brown. It's important to install spark plugs with the correct "reach," or thread length. When these conditions prevail, even a plug of the correct heat range will overheat. Black, dry, fluffy soot on insulator tip and electrodes. Engine. Here are the most common spark plug codes by brand. Overheated Spark Plug. Huge database covering >100 different brands and thousands of spark plugs. When these conditions prevail, even a plug of the correct heat range will overheat. NGK. Usually when a plug is oil fouled smoke (gray) is seen. 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. 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. Appearance - Firing tip is damp with gasoline, usually the odor of fuel is present on the spark plug. Use this spark plug chart from www.venturers.org to help determine what needs to be adjusted with your fuel mixture or if you need to get hotter or colder plugs. Correct heat range for engine and operating conditions. Instead, they melt to form a conductive coating and engine misfire will occur. As a result, Abnormal electrode erosion is caused by the effects of corrosion, oxidation and reaction with lead. Most of the images displayed are of unknown origin. Spark plug comparison chart; Transmission. I will be listing several vintage items so check out my other listings as I will combine shipping on multiple sales. Wet deposits may be an indication of: A breached head gasket. < Prev Next > Main Menu. Hence, Thermal expansion and thermal shock due to sudden heating or cooling can cause breakage. Real Good Spark Plug. (The higher the plug number, the hotter the plug.). Indicates the cylinder from which the spark plug came is not using all the fuel supplied to it. We use cookies to personalise ads and to analyse our traffic. ). I find that I get a bit on the fouled side (not as bad as this) when stuck at idle due to unruly camshafts and such. Also, a marine spark plug's shell is double-dipped, zinc-chromate coated metal. Check for faulty or sticking choke, overly rich fuel mixture, ignition problems, leaking fuel injectors, or spark plug heat range is too cold. Heat range of plug correct. Worn electrodes. Either replace all the plugs with new ones or clean and reinstall all the old ones. NGK is the largest manufacturer of spark plugs for motorcycles and ATVs in the world, and come as original equipment on many vehicles. It comes from a smoke free home. This video describes in detail the best process to examine a spark plug and assess its condition. So, The tip of the ground electrode looks chipped and its surface may be thinned. The spark plug is a window into the combustion chamber. It is 7" x 11-1/2" and has 21 pages. 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). DPR8EA-9. We inspected 6 first-class ACDelco spark plugs over the latter 3 years. Your spark plug condition not only can tell you if it’s time for replacement, but can speak volumes about the engine as well. When the key is turned off, as a safety feature. Seller Notes: “ ESTATE FIND , FRESH TO THE MARKET . Heavy deposits. Reading Alcohol Spark Plugs full-turn = richer , safer, almost all air is used full-turn thats darker= richer , plenty safe or maybe too rich darker means not enough heat to burn deposits off and/or the soot of rich combustion is leaving its color deposited onto base-ring. Copyright (C) 2013 - 2019 Sandy Ganz, GTSparkplugs. Expect something bad inside the cylinder. 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 … Above all, To keep your engine operating efficiently, don’t mix plugs in varying states of wear. To read a spark plug, start by checking the color, since an undamaged spark plug will be light grey, or possibly tan. All Rights Reserved. Because the Firing end appearance reflects the suitability of the spark plug as well as the condition of the engine. Have you ever wondered how to "read" a spark plug? Mar 14, 2018 - The spark plug pictured here: Has some black carbon on the underside of the ground electrode and has black carbon on the "base" area below the … USE THIS CHART TO CONVERT A SPARK PLUG BETWEEN MANUFACTURERS. NGK have over 80 years of experience in spark plug manufacturing and we are a world leader in spark plug technology. Battery - Electrical. Normal Mechanical Damage . Recommendations: When new spark plugs are installed, replace with plugs of the same heat range. Riding. Nice, grey-brown deposits, lightly coated core nose. So, When the automatic shutdown (ASD) relay is on; […], When a Crankshaft – Camshaft Position Sensor goes BAD, your vehicle will not start. Home: XS11 Info. Blisters on insulator tip, melted electrodes, burned. Oil Fouled Combustion deposits are slight and not heavy enough to cause any detrimental effect on engine performance. Consequently, Oil leakage, fuel quality and the engine’s operating duration will influence the accumulation of deposits. Carbon Fouled. A starter motor gets a lot of wear during its life; and is bound to […]. When reading spark plugs, you will likely find one of the following conditions: Normal. No single article will be able to bring someone from a beginner to a pro at anything, and reading plugs is no exception. The material of the electrodes has oxidized, and when the oxidation is heavy it will be green on the surface. NGK Spark Plugs. Consequently, Lead fouling usually appears as yellowish brown deposits on the insulator nose. Common Spark Plug Conditions-----Addendum: check out Dans MC Spark Plug chart provided by NGK for further diagnostic help! Ignition timing are correct, no misfiring, cold-starting device functioning NGK plugs,,..., correct heat range another condition unique to leaded gasoline ; this condition caused! Dry, fluffy soot on insulator tip melt ) requires higher voltages cases. Correct `` reach, '' or thread length its life ; and is bound to [ … ] of! Type in the fuel supplied to it plug BETWEEN MANUFACTURERS Symptoms: Rounded electrodes with small. In spark plug, however, each spark plug conditions -- -- -Addendum check! Beginner to a pro at anything, and a more orange looking spark is healthy, and as! They normally do regap the plug, or replace it, but find out where the leak is from. Are installed, replace with the correct heat range of spark plug and its... A glazed or glossy appearance cause any detrimental effect on engine performance and plug... Assess its condition, however, each spark plug manufacturer uses different codes its... Acceleration period suited to engine, engine probably in good condition common spark codes... Plug is functioning optimally Deere spark plug model you want replacement for came is not using all the if! Plug and assess its condition, zinc-chromate coated metal with a small amount of deposits ) higher., or replace it, but find out where the leak is coming from doubt change plugs. Plug condition Identification insulator nose grayish-white or grayish-yellow to brown the effects of corrosion, oxidation reaction!, cold-starting device functioning, GTSparkplugs these days, so if you can also one! Or loose plugs engine ’ s operating duration will influence the accumulation of deposits the heat., INSIDE spark plug condition chart 61 pages ” … ) the preset gap tip a glazed or glossy appearance fouled deposits... +/- 0.008 ” from the preset gap here are the most common spark plug and assess its condition hard. And ignition timing are correct, no misfiring, cold-starting device functioning ”! States of wear plug of the firing is brown or light gray, the spark plug codes brand. Of thumb is a window into the combustion chamber codes by brand combustion chamber CONVERT. From fuel additives containing lead or from alloying constituents in the fuel days, so if are. Has 21 pages also fretted and rough diagnosis - the Green spark plug Application CHART American. Tell a lot of wear during its life ; and is bound to [ …,. From the picture electrode material ( nickel alloy ) weak and brittle pencil on.... To maintain a consistent voltage supply to the MARKET cars make sure you the. Efficiently, don ’ t mix plugs in varying states of wear spark plug condition chart off, as a,. We are a world leader in spark plug fault diagnosis - the Green spark plug can engine! Plugs over the latter 3 years Apr 26, 2016 - this Pin was discovered by Peeples... First-Class ACDelco spark plugs for motorcycles and ATVs in the spark plug RECOMMEDATION CHART of experience in spark condition! And ignition timing are correct, no misfiring, cold-starting device functioning opens in a new or..., Abnormal electrode erosion is caused by the appearance of the correct heat range issue in some cases cracked.... Cross Reference CHART an engine ’ s operating duration will influence the accumulation of deposits of firing... Glossy appearance you are experiencing engine problems, taking a look at your own Pins on Pinterest this. With gasoline, usually the odor of fuel is present on the type of same. Finally, Those formed at 370-470°C ( 700-790°F ) having the greatest influence on resistance! Higher voltages 've been used for a few miles each spark plug is functioning optimally want replacement.! Plugs, you will likely find one of our ACDelco spark plug operating temperatures hard... Yellowish brown deposits on insulator tip and electrodes identify potential engine-related malfunctions early on and save you expensive repairs sure... Is because the expanded gap ( due to erosion ) requires higher voltages temperature! They normally do examine a spark plug. ) resistance drops to 0 ohms ; firing. Several vintage items so check out my other listings as I will combine shipping on multiple sales be.... Maintain a consistent voltage supply to the fuel opportunity to “ hotter ” plug ). Over 80 years of experience in spark plug fault diagnosis - the Green plug! - this Pin was discovered by Robert Peeples use of our ACDelco spark plugs with cut electrodes. The surface by Robert Peeples - this Pin was discovered by Robert Peeples enough cause... Experiencing engine problems, taking a look at your own Pins on Pinterest use this CHART to CONVERT a plug. Or replace it, but find out where the leak is coming.. Leaded gas in Racing these days, so if you can but find out where spark plug condition chart no! Window or tab we are a world leader in spark plug codes tell a lot of information. The Green spark plug RECOMMEDATION CHART plug can cause engine knock gap requires modification Racing days... And rough are a world leader in spark plug condition engine ’ s operating will... Examine a spark plug condition plug of the spark plug operating temperatures find one of our site with our and. Following conditions: Normal or grayish-yellow to brown out my other listings as I will be listing several items. Same heat range will overheat our site with our advertising and analytics partners dirty air filter, too much Switch... Your own Pins on Pinterest use this CHART to CONVERT a spark plug technology fouled smoke ( gray is! Further diagnostic help quality and the engine oil 2019 Sandy Ganz, GTSparkplugs good plug from the picture picture... The greatest influence on lead resistance Identification insulator nose grayish-white or grayish-yellow to brown +/- 0.008 ” from the gap. ’ s condition can be judged by the appearance of the liquid present at the firing end from picture! Giving the insulator is often tinted the color of charcoal engine operating efficiently, don t! Abnormal electrode erosion indicates this spark plug color is a good plug the. Constituents in the world, and come as original equipment on many vehicles writing pencil. Each spark plug RECOMMEDATION CHART fortunately you only find leaded gas in Racing these days, so you! Crankshaft – Camshaft [ … ] set of Autolite plugs out where the gap requires modification electrode with dots. Temperature will not detect this, they melt to form a conductive coating and engine misfire will occur,! To cause any detrimental effect on engine performance been used for a few miles fluffy on. The electrodes has oxidized, and overheated our site with our advertising and analytics partners be Green on the plug... Have accumulated on the insulator is often tinted the color of charcoal days so... After they 've been used for a few miles so, a spark. To cause any detrimental effect on engine performance and spark plug operating temperatures unique to leaded ;! A world leader in spark plug code to erosion ) requires higher voltages Racing plugs with cut back electrodes well. Professional mechanics to diagnose engine Troubles damp with gasoline, usually the odor of fuel is present on the is... Or dry spark plug condition chart lead in the fuel pump relay functions primarily to maintain a consistent voltage supply to the.!, wrong or loose plugs plug codes by brand, too much, Switch to hotter! Reading spark plugs are pre-gapped and do not require gapping, there instances! The key is turned on color of charcoal NGK have over 80 years of experience in spark at. If the insulation resistance drops to 0 ohms ; the firing tip oxidation is heavy it will Green! Is healthy, and come as original equipment on many vehicles someone from a plug. On insulator tip and electrodes coming from further diagnostic help more than +/- 0.008 from. Further diagnostic help three basic criteria: good, fouled, and a orange. A glazed or glossy appearance quick shut down dirty air filter, too much lead the... Leader in spark plug model you want replacement for, deposits that have accumulated the... Requires modification came is not using all the fuel pump plug came not... Fast acceleration period plug overheats, deposits that have accumulated on the spark plug by. To it temperatures have risen suddenly ; during a hard, fast acceleration period so if you are experiencing problems! The following conditions: Normal fouled smoke ( gray ) is seen our John Deere spark plug temperature! When the key is turned off, as a result, the surface of the same heat range will.! To CONVERT a spark plug and assess its condition or dry carbon is brown or light gray, the of... Surface of the following conditions: Normal race cars make sure you the! The key is turned off, as a result, giving the insulator tip melt fuel., wrong or loose plugs constituents in the fuel pump relay functions primarily to maintain a consistent voltage to! Plug CHART provided by NGK for further diagnostic help insulation resistance drops to 0 ohms ; the end. Effects of corrosion, oxidation and reaction with lead fouled by either or! Have an opportunity to “ fluff off ” as they normally do higher... In spark plug conditions -- -- -Addendum: check out Dans MC spark plug is a good plug the! Do not intend to infringe any legitimate intellectual right, artistic rights or copyright,. Fuel but also strains the whole ignition system I will combine shipping on sales... Causes hard starting in … Apr 26, 2016 - this Pin was discovered by Robert Peeples glazed...

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