The spark plugs have 3 races on them, car was running great, and 3 of them look absolutely perfect and brand new.. NGK SPARK PLUG’s Technical Service team recently became aware of cases where customers bought CR9EIX NGK spark plugs on the internet, which proved to be fake products. Photo 1: Broken ground electrode. Surface discharge plugs may be required in high compression applications or with high energy ignition systems. E3's DiamondFIRE design features an open section at the top of the ground electrode, combining the benefits of additional sharp electrode edges with a cut-back electrode design. You can try adding a tr-9 plug to the car. Also known as an inverted v-tip, tapered v-profile, trimmed side, v-trimmed or wedge shaped ground electrode, all trimmed designs have the same purpose: to reduce quenching and shadowing by reducing the surface area between the electrodes which could hinder the growth of the flame nucleus. The angle electrode design exposes more of the flame kernel to the air/fuel mixture, improving combustion and reducing quenching. The steel pin (ignition pin) enclosed in a gas-tight fit within the conductive glass melt, A spark plug (sometimes, ... Other variations include using a recessed central electrode surrounded by the spark plug thread, which effectively becomes the ground electrode (see "surface-discharge spark plug", below). For instance when an 8k is maxed rev usually is taken to 75 even if the o2 comes on and you run it too hard. Oversized electrodes are designed to withstand higher thermal and mechanical shock inherent with high compression motors. The nickel on the sparkplug doesn't melt until 2600 degrees.. This may be for combustion chamber design as in the case of a rotary engine, or a surface gap design as used in leaner air/fuel ratio’s on industrial engines. A smaller electrode also reduces flame quenching. Dry and Wet Fouling. i am a 18 yr old male without a car and no ride to get places. Ones I've seen with only a burnt electrode had the piston melting. The loose plug can definitely burn the electrode off. A smaller electrode also reduces flame quenching. Topic: Melted plug electrode The car is a 93 Honda Accord with the stock 4 cylinder F22A6 motor. my 1991 pontiac grand am le is melting only one spark plug. Hi guys, few days back my car was misfiring badly under full boost and the boost controller is set at 1 bar but once it hits 0.8bar, the car misfires and the boost bounces around 0.8 bar. it also melts the ignition coil cover. This same design reduces quenching, which has a negative effect on the spark. spark plug in any of the cylinder has melted. Read this crucial post to find the real reasons behind the melted car plug. This ground electrode shape allows the spark to be focused between the fine-wire center electrode and projecting platinum ground electrode. Therefore, these plugs are susceptible to fouling in cold applications. Combustion deposits are slight and not heavy enough; to cause any detrimental effect on engine performance. “These spark plugs melted and caused damage to our customers’ engines, which is annoying, costly and avoidable”, says Kai Wilschrei, Manager Technical Services Aftermarket EMEA at NGK SPARK PLUG EUROPE. Cut back ground electrodes decrease the obstruction of the flame kernel to the air/fuel mixture, preventing quenching. Furthermore, indicating the plug is in the correct heat range and has been operating in a “healthy” engine. 6. Surface gap plugs present the flame kernel to the piston (or rotor) more directly, reducing the travel time from the spark to the combustion gases. An electrode for a spark plug as recited in claim 1, wherein, when the slug is melted, a cone-shaped interface is provided between the firing tip and the end surface of the elongated blank metal. Bosch indicates low KV will cause ground electrode damage, aka barely enough spark to fire the plug, additionally they indicate additives can be the cause. 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. However, fundamentally, it is necessary to select a spark plug that matches the … This is the process of diagnosing a code PO302 Cylinder #2 Misfire. We face car issues on a daily basis. Its low profile design is resistant to vibration. Save Share. Check if your vehicle has any lean spike issue. The U-groove cut in the ground electrode gives room for the spark to grow into a larger flame for greater firing energy and more complete combustion. knocking). Caution should be made in selecting a "high performance" plug. Be the first to know about sales and promotions, Standard spark plugs typically feature a traditional ground electrode. Replace with a colder heat range of Autolite spark plug. Its low profile design is resistant to vibration. I pulled the spark plugs on the shore, and the middle cylinder spark plug electrode seemed melted to the center electrode with no gap! Worn electrodes When the spark discharges, it burns off any carbon build-up. Projected square platinum electrode (PSPE) spark plugs apply a square shaped tip of platinum to the end of a shortened ground electrode. You sometimes see a very bright white electrode with black dots on it also as a heat range issue in some cases cracked electrodes. Read this crucial post to find the real reasons behind the melted car plug. Iridium, like platinum, is a precious metal and has extraordinarily superior properties for a spark plug electrode, for example high-temperature withstand, high strength, and … Electrode Gap Metric Conversion Gapping Specifications (Bosch OE Fine Wire Iridium, OE Fine Wire Double Platinum, and OE Fine Wire Platinum Spark Plugs come with gaps pre-set at the factory. Ground electrode variations include angled, cut back, DiamondFIRE, DFE (double fine wire electrode), flat, hybrid, inverted v-tip, low-angled, multi-ground, oversized, PSPE (projected square platinum electrode), semi-surface discharge, shield strap, side discharge, slant, square, surface discharge, surface gap, taper cut, tapered v-profile, trapezoid cut, trimmed side, U-groove, v-trimmed, and wedge shaped. When the insulator becomes clogged with carbon, the ignition voltage jumps over to the side electrodes, enabling the plug to operate even under severe conditions. Thus, if the engine design requires a side discharge plug, more ground electrodes extend plug life. Check if you use an ECU program with no rev limit and the car is running lean. See if the pump is in good condition. Blisters on the insulator tip, melted electrodes, or white deposits are signs of a burned spark plug that is running too hot. Causes can include the engine overheating, incorrect spark plug heat range, a loose spark plug, incorrect ignition timing or too lean of an air/fuel mixture. No power and wants to die. The most common reason that we find is that the spark plug in any of the cylinder has melted. In this case, it might be running rich. ・ As a countermeasure to increased stress on the ground electrode, changing to a spark plug with a small ground electrode is an effective way to handle the problem from the plug side. The defective plugs cause the vehicle to not function. You have tried to replace it twice, and yet the issue continues. Inspect about the kind of shot it has, like 150. A carbon-fouled plug will have black, dry soot on the electrodes and insulator tip. Overheating of the plug causes the center electrode to expand, and this can break the insulation. Replace the plugs if you have to, but check the real reasons behind the issue. The plug electrode did look fractured to me rather than melted though but I guess that could also happen from detonation. Synthetic Oil V/s. Even if you change one of the spark plugs, it does not solve the problem! The defective plugs cause the vehicle to not function. Bosch Super Plus Spark Plugs also have factory-set gaps. Developed for engines that tend towards increased carbon depositing as a result of their design, hybrid spark plugs have a standard ground electrode as well as two smaller ground electrodes on each side. Other manufacturers indicate loose plugs can be the cause due to vibration (NGK), also loose plugs tend to damage plug threads, as the thread is the point of electrical connection and loose plugs would experience intermittent grounding. All designs create a spark along the insulator nose to remove carbon build-up. Most often car owners find that the spark plug in their cars has turned inefficient. Here was the exhaustive list of analysis behind the issue of the melted spark plug. Loose spark plugs pull air into the combustion chamber and lean that cylinder. Now it is running the same as before. A smaller electrode requires less voltage to jump the gap, resulting in fewer misfires, which translates to increased fuel economy and horsepower. If the engine is not performing properly and on removing a spark plug it is found that the electrodes have melted or the porcelain insulation has broken, this could be construed as a spark plug … Once the plug has reach operation temperature and the deposits are removed, it returns to "normal" operation, with the spark jumping between the center and main ground electrode. I then pulled the spark plug and it was melted. U-groove spark plugs are a patented design by Denso to improve ignitability and reduce quenching. The common reasons are many. My ski was running real rough. Erosion at these points creates a larger gap between the center and ground electrodes, causing plug misfire. They have no given heat range as the electrode design prevents the firing tip from overheating, and the insulator is flush with the metal shell to dissipate heat quickly. Pick up some merchandise at: https://lolfit.bigcartel.com 7. Appearance - Ceramic insulator tip appears to have a melted, glazed coating. Ground electrodes come in a variety of shapes and sizes. See Spark Plug Gapping section. These gaps are never to be adjusted.) Check to see if the timing is controlled. If you discover oily deposits that are black on the insulator thread or the electrode it usually indicates oil is leaking past the pistons and into the cylinder of the engine. Standard spark plugs typically feature a traditional ground electrode. Thus the gap remains constant through the plugs entire life. I have a 97 Ford Explorer that has burned the spark plug electrode off which caused rough running. It might have a brown lining on it. Image 18: This damage is from impact, drop or pressure on center electrode. The spark plug should be replaced. The spark plug in detail Electrode Gap EA EA Connector for the spark plug ( The illustra-tion shows an SAE connector , older vehicles are fitted with connectors with M4 threads ). Copyright © 2020 DRIVING LIFE - This site is owned and operated by LIW LLC, a limited liability company headquartered in California, USA. The side electrode design tends to wear faster than a traditional plug. All trimmed designs have the same purpose: to reduce quenching and shadowing by reducing the surface area between the electrodes which could hinder the growth of the flame nucleus. A cut back ground electrode serves a similar function to a taper cut ground, fine wire ground and angled ground electrode. A low angled ground electrode is shorter and closer to the metal shell and center electrode, providing a faster path to transfer heat away from the ground electrode. Most often car owners find that the spark plug in their cars has turned inefficient. The most common reason that we find is that the spark plug in any of the cylinder has melted. Double fine wire electrode (DFE) spark plugs apply a fine wire pin to the ground electrode in addition to a fine wire center electrode. A taper cut ground electrode serves a similar function to a cut back ground, fine wire ground and angled ground electrode. Note 1: The standard spark plug types fitted in high-revving, high-output engines are the multi-electrode type that is not so susceptible to electrode breakage and the type with a sparking portion that does not project very far; be sure to use the authorized spark plugs. Should not use anti-seize on the threads, just proper torques. The fuel solenoid might be sticking closed. From there, the heat is dissipated into the cylinder head and eventually into the cooling system. Carbon fouled. This lowers the spark voltage, secure reliable spark, reduces the quenching effect, and improves ignition performance. If your car came OE with a multi-ground plug, your engine will likely wear through single electrode plugs, especially fine wire plugs, at a rapid rate. The increase of available edge-to-edge surface area encourages a more rapid spark discharge while also reducing quenching and shadowing. Check if your fuel pump is going out. Center electrodes can be melted or eroded by thermal overload due to auto-ignition (i.e. A slant ground electrode is shorter and closer to the metal shell and center electrode, providing a faster path to transfer heat away from the ground electrode. A yellow glaze on the spark plug’s electrode and the tip can inhibit conductivity, keeping the spark from being able to jump the gap. It is important to note that multi-ground does not mean multi-spark, there will still only be one spark at a time. This can be caused by a dirty air filter, excessive driving at low speeds, too rich of a fuel/air mixture or idling your vehicle for too long. Ground electrode variations include, PSPE (projected square platinum electrode). Feeds the ignition voltage to the central electrode. 5. New spark plugs should be installed. Share these very important car plug solutions with your friends. plz help. If you are very mechanically inclined you can try and pinpoint the problem, or take it to a qualified small engine mechanic to diagnose. The electrode tip of a spark plug presents a major source of auto-ignition. Here’s another general car ache! I'd be watching the exhaust like a hawk for any signs of black smoke and listening for any sounds of detonation during the dyno pull. Cars are the lifeline for all of us! When you remove the spark plug from the first cylinder, you may find the following: See if the internal sides of the cap have any scratch. Normal Spark Plug Color. Look at the rotor on the outer edge of the white part. If the auto-ignition/thermal overload is bad enough, you can end up with simultaneous damage to the center electrode and ground electrode(s), and sometimes you end up with soft/spongy/cracked insulator tips (the white part). Complete a test for compression. Cause: Overheating caused by auto-ignition. The aluminum piston melts at only 1250. Next time you see a melted car plug, relax! Check this post and get out of the problem with a smile. Best Engine Air Filters: Our Top Picks in the Market, The issue does not go away even after you install some ngk platinum, after carefully tightening it by hand with some dielectric grease, Cylinder seems fine for a while; however, after being idle, the car stops, See if there is a hole in the piston of the spark plug. A smaller electrode requires less voltage to jump the gap, resulting in fewer misfires, which translates to increased fuel economy and horsepower. Will be checking plugs again soon. LIW LLC is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. True surface discharge or surface gap spark plugs have no side electrode, instead utilizing the entire face of the plug shell as a ground to ignite. Sometimes the end of the plug … What Is The Cause And Solution Of A Melting Spark Plug? Heat can build up rapidly, and if it has no place to go it's going to do its thing on the air/fuel charge. Add your valuable comments below. Examples: 2-ground electrode plug, small ground electrode plug (taper cut), racing plug, surface discharge plug, etc. All trimmed designs have the same purpose: to reduce quenching and shadowing by reducing the surface area between the electrodes which could hinder the growth of the flame nucleus. it has quite a few miles on it and i need to know whats wrong with it. Opened up the spark plugs and were shocked to find that plug #1 and #4 were melted while plugs #2 and #3 is seemingly fine. Double fine wire electrode (DFE) spark plugs apply a fine wire pin to the ground electrode in addition to a fine wire center electrode. Many variations of the surface discharge plug exist, including the semi-surface discharge, intermittent gap, supplementary gap, and surface air gap plug. Spark plug is operating too hot at high speeds. A trapezoid cut ground electrode is a variation of a taper cut ground, which serves a similar function to a cut back ground, fine wire ground and angled ground electrode. Plug was passenger side rear plug. A flat ground electrode is shorter and closer to the metal shell and center electrode, providing a faster path to transfer heat away from the ground electrode. Insulator tip blistered, spongy and soft. Reducing the electrode size on a standard nickel plug would result in a drastically shortened life span, so smaller electrodes require exotic metals such as platinum or iridium to maintain (and at times surpass), the longevity of a traditional spark plug. Side discharge ground electrodes move the ground electrode to the side of the center electrode, reducing the obstruction of the flame kernel to the air/fuel mixture, preventing quenching, and presenting the flame kernel to the piston (or rotor) more directly, reducing the travel time from the spark to the combustion gases. In an electrode for a spark plug, an elongated blank metal is made of a nickel-based alloy and including a front surface. The common reasons are many. Multi-Ground plugs are offered in 2, 3 and 4 ground electrode designs. ... Could have been a bad sparkplug but I've never seen a plug that bad. In a semi-surface discharge design, the voltage path skims across the surface of the insulator. See the Hall of Shame for one Here, let us analyze common issues and find their solutions too. If you doubt that the plugs are too heated, then that's the reason for the issue. Some engine designs require the spark plugs have the ground electrode placed to the side of the center electrode rather than below as on a traditional plug. I think I discovered why spark plug #3 melted... Want to help support my build? You might even take a few degrees out from the timing. Install new spark plugs. An angled ground electrode serves a similar function to a cut back ground, fine wire ground and taper cut ground electrode. Engine is OK. Heat range The wide gap improves ignition capability and is less sensitive to gap growth. Note: The brown to greyish tan color and minimal amount of electrode erosion. For instance, due to ignition being too far advanced, combustion deposits in the combustion chamber, defective values, defective ignition distributor, poor-quality fuel. Clean it by spraying your spark plug with brake cleaner, letting it soak for about 10 minutes, then wiping it with a clean cloth. An electrode for a spark plug as recited in claim 2, wherein the slug is in the form of pellet or powder. Spark Plug Condition Identification Melted deposits on center electrode. You could try to richen it up and add some TR7s. remember that the wide band only picks up the integrated O2 ratio of the cylinders, A few cylinders can make a tough vacuum signal, The manifold design can rob other cylinders off the much-required, Do check your cars static compression ratio, a 150-hp shot seen in one system is totally different from the others, Pull out the plugs and inspect them carefully, The car might be either running on lean, or has too much ignition advance, or both together, Or the fuel filter is obstructed, or fuel pump is defective, Place the timing back to about 20 degrees, Replace the plugs if you have to, but check the rea, Most Common and Visible Issues, Top 10 Hidden Crucial Reasons. A smaller electrode requires less voltage to jump the gap, resulting in fewer misfires, which translates to increased fuel economy and horsepower. Additionally the concave cut in the ground electrode promotes even gap growth. If the plug has been used for too long, the insulator nose can be cracked by deposits between the center electrode and the insulator and from corrosion of the center electrode. Its low profile design is resistant to vibration. A normal spark plug will have brown or grayish-tan deposits on the side electrode. They are also used in rotary engines as they present a flush face to the combustion chamber, eliminating interference with an electrode tip and exposing the spark to the entire air/fuel mixture for improved combustion. Normal spark plug. Replace the plugs and try again. How To Solve 2000 Dodge Dakota Transmission Problems? Here, let us analyze common issues and find their solutions too. A smaller electrode also reduces flame quenching. Mineral Oil – Which Option Will You Choose? E3 has taken multiple spark plug design features, such as cut back ground electrodes, sharp edges and surface gaps, and combined them to create a new ground electrode design. A thin square pad of platinum is welded to some ground electrodes to ensure durability. 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. When you are running a ported head, for instance, it may have a 5.7 head or not. Spark plug conditions Normal Carbon-fouled Oil-fouled Severe centre electrode wear Heavy lead deposits Ash-fouling Partially melted centre electrode Melted centre electrode Melted electrodes Ferrocene Severe ground electrode wear Cracking of insulator nose Insulator nose from gray-white/gray-yellow to fawn brown colour. Spark Plug with Oil Deposits – Besthomegear.com. Photo Credit: http://forums.vwvortex.com/showthread.php?6965882-my-engine-melting-the-spark-plugs-2E-engine, Photo Credit: http://www.thesamba.com/vw/forum/viewtopic.php?t=362566. Autolite uses a one-piece ground shield strap design on their HT (High-Thread) plug for improved heat transfer. 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( taper cut ), racing plug, surface discharge plugs may required... Alloy and including a front surface find that the spark plug is in the form of pellet or.! In high compression applications or with high compression motors kind of shot it has, like 150 the center.. Are susceptible to fouling in cold applications and eventually into the melted spark plug electrode chamber lean. And lean that cylinder glass melt, My ski was running real rough OK. heat range Autolite...