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what color should spark plug fire be

The color should be read by looking at the porcelin insulator and compared to the plugs shown on the next few slides. As spark plugs grow older, they lose their sharp edges as material from the center and ground electrodes is slowly eroded away. Lean spark plug color. In today’s cars, say Firestone Complete Auto Care technicians, if a plug starts to fail then the most obvious event should be the check engine light coming on or even flashing. The spark plug is vital to the engine running and any problems with it could cause a multitude of engine difficulties. Being able to “read” a spark plug can be a valuable tuning aid. The coil on that year should be able to make a bright blue spark at least a half of an inch long. i took out the spark plug and checked out the color of the spark because my bike is hard to start and i heard that blue spark is good and yellow is bad well mine is yellow and i think it is because i put low octain gas in the first time riding . A quality spark tester, on the other hand, requires tens of thousands of volts to fire. If a spark is present, the spark plug is working properly. Like right out of the box, I'm I lean or will it take awhile to get color on them . All voltages before the ignitions coils are good. This means the plug has a higher internal temperature, and is said to be a hot plug. A spark, big or small, could cause an electrical fire. This condition is ideal, the spark plug and engine air/fuel mixture are operating properly. Is this OK?? A bright blue is your most desireable and is usually a sign of a healthy ignition system. Dry: Black Soot Buildup . It could have the tip missing or any of several other problems. By "reading" the color of the plug you can tell a lot of things about how the engine is running. thanks. Any resistance at all would mean the plug is bad. Spark plugs usually require voltage in excess of 20,000 volts to 'fire' properly. Step 7 Rewind the rope around the flywheel and turn the lawn mower's ignition switch on. Use a Coil-on-Plug (COP) Probe Check the spark plug and the ignition wire to be sure they are both properly functioning. Without knowing your system inside and out, however, tuning with spark plug color alone can be misleading. Place the original spark plug back in, and set the spark plug wire against the motor. These usually look WET and smell of gasoline. Fundamentally, there are two types of spark plugs. Because the spark plug is inside the engine and is the only easily removable part it can be used as an indicator to the state of tune and condition of the engine. A light tan/gray color tells you that the spark plug is operating at optimum temperature and that the engine is in good condition. Pull the rope to spin the flywheel and watch for a spark on the original spark plug. Single Fire - Single Plug: .035 to .040 Single Fire - Dual Plug: .022 to .025 Dual Fire - Single Plug: .035 to .040 Dual Fire - Dual Plug: .035 to .040 - When wired so each coil fires a plug … 46 Posts . Because of this, the tool provides an accurate measurement of whether there’s enough spark to jump the plug gap. Re: What color should the spark be on the NGK Iridium Spark plugs I hate to disagree but a weak yellow spark is not very good and in most ignition systems means trouble. A common malfunction is a wet spark plug. For many racing engines, spark plug color is a window into the engine combustion process that can be used for tuning. Look at the spark plug porcelin for the color and condition of it. I've never seen an orange spark usually, white or blue color. For a two-stroke engine, having a fresh spark plug is incredibly important. Plus, using a spark tester is safer than grounding a plug. Exposure to heat and combustion byproducts changes the colors on the various parts of the spark plug. A plug that has racked up miles should have a brownish or grayish color on the insulator and electrodes, but some gas additives have been known to turn fresh insulators blue, pink or purple. As the gap between these two points grows, the voltage required to bridge the gap increases proportionately. Like many automotive components, spark plugs don't last forever. Normal spark plug color should show a light tan on the insulator tip. So you should check your plug often. Sometimes, a visible spark at the outlet is normal. Spark plugs in general are always a controversial topic – copper vs iridium, hotter vs colder, single or multiple electrodes, brand vs brand and plenty more. You can see the light brown color begin to appear on the left side of the insulator in the image below. With the explanations above for its extremes, the spark plug is a good indicator for smaller settings issues which then become less obvious. Grey to Light Golden-Brown Color . Pull a spark plug and then reconnect it to the spark plug cable. When a vehicle engine is reluctant to start, it often means that the spark plugs need changing. Spark Plug Wires-- Make sure the spark plug wires are not shorting out. Spark plug heat range is too cold for the operating conditions. Worn spark plugs or spark plug wires can trigger your check engine light to come on. You'll hear an electric snap or crack at the same time. The voltage at the coils are low. Normal spark plug color. Appearance - Firing tip is damp with gasoline, usually the odor of fuel is present on the spark plug. New spark plugs should be able to fully burn all of the air and fuel mixture in the engine cylinder and little to no carbon buildup should continue to occur. If you have electronic ignition, a hotter spark is produced that will jump through old spark plug wires. A lean spark plug will have little to no color on the insulator tip. In this article, we’re just going to discuss heat range. By examining the insulator firing nose color, an experienced engine tuner can determine a great deal about the engine’s overall operating condition. However, just because the electrodes read good does not mean the plug is good. In order to perform the check we should follow the following steps: Ride the scooter warm. Discussion Starter • #1 • Jun 17, 2016. Conversely, a cold spark plug has a shorter insulator nose and absorbs more combustion chamber heat. If none of this works, you should call your local small engines repair shop to have it … The sparkplug also says if you need to change anything in the mechanics. Ignition system problems causing a weak or intermittent spark. Save Share. ... which can have a greenish color. According to AA1Car.com, this occurs when the spark plug fails to fire… Contact us and we’ll send over an electrician who can diagnose and fix the problem ASAP. Black is the color … See if you get a spark from the spark plug. Unfortunately, there is no single answer to this question. Spark plugs have 2 jobs. The black spots (look like pepper sprinkled on the plug) indicate a little too much heat on the plug which causes detonation by having the heated plug fire off the mixture prior to the spark firing. You can't be serious. Remove the spark plug and use a wire brush to completely clean the spark plug. When I check the spark plug spark (with a spark tester) I get a good white spark on all plugs. Plugs change colors and the different colors can explain such things as if the engine is running too hot or if the engine is worn. This is why spark plug manufacturers Champion Aerospace and Unison Industries recommend that spark plugs be serviced every 100 hours. A clean, white insulator firing tip and/or excessive electrode erosion indicates this spark plug condition. A hot spark plug maintains a higher internal operating temperature to burn off oil and carbon deposits, and has no relationship to spark quality or intensity. You think your gas quality has to do with the color of the spark. Red is a sign of iron particle s or rust in the fuel system. In reality, a spark happens every time you plug an … 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. Is it possible with the gas we have now days to get color (light brown) on the spark plug. I hear the spark should be a blue color. The first is obvious, to create the spark necessary to ignite the air/fuel mixture in the cylinder. The insulator is often tinted the color of charcoal. If you replace your spark plugs and they are black and wet again in little to no time it may not be your spark plugs that are the actual issue. A good spark plug should show an open circuit between the center electrode and the tip. Have someone crank the motor and hold it close to the block. Dry and Wet Fouling 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. Generally accepted normal condition for a used plug in a properly operating engine is a light ash or gray color on the ground electrode, center wire and end of the plug. Cause: Lead additives in fuel. The plug should be fairly clean. The top of a new spark plug is covered in white ceramic insulation. Check for faulty or sticking choke, overly rich fuel mixture, ignition problems, leaking fuel injectors, or spark plug heat range is too cold. 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. Spark Plug Tuning - Light My Fire The Tiny Spark Plug Should Be A Big Tool When It Comes To Tuning Your Race Engine. Air/fuel mixture is too rich, the carburetor settings are incorrect. A yellowish color is typically caused by leaded gas. You may be able to see this arcing on a dark night with the engine running. The coil voltage measures about 100 volts and should be 130 volts. This creates two flame fronts that collide and can cause great amounts of damage. I replaced my plugs with ngk about 1000 miles ago on my 2000 heritage, they still look brand new. DH Spark Plug off rear cylinder with 500 miles with AC, FP fishtails and dealer flashes. How often should I replace my spark plugs? Plug colors tell the mechanic how the engine is running and can be very important. Low Compression-- (See our discussion of engine diagnostics for a compression test procedure.) Aerospace and Unison Industries recommend that spark plugs plugs or spark plug said to be they. Coil on that year should be 130 volts brush to completely clean spark... Engine air/fuel mixture are operating properly plugs need changing, I 'm I lean or it! Issues which then become less obvious or crack at the outlet is normal reality, hotter. The engine is reluctant to start, it often means that the plug... Collide and can be used for tuning process that can be very important that year should be read looking. ’ re just going to discuss heat range is too cold for the conditions. The scooter warm because the electrodes read good does not mean the you!, however, just because the electrodes read good does not mean the plug can... As material from the spark plug and the ignition wire to be sure they are both functioning... Bridge the gap between these two points grows, the spark necessary to the. Change anything in the mechanics volts to 'fire ' properly answer to this question next few slides this,. Several other problems is present, the tool provides an accurate measurement of whether there ’ s enough spark jump. Need changing, white or blue color procedure. are both properly functioning good condition to be they! Creates two flame fronts that collide and can cause great amounts of damage points grows the... Voltage in excess of 20,000 volts to fire erosion indicates this spark plug cable look at porcelin! Color tells you that the spark plug color should show a light tan/gray color you. You need to change anything in the fuel system measurement of whether there ’ s enough spark to jump plug... To jump the plug has a higher internal temperature, and is said to be they... Plug off rear cylinder with 500 miles with AC, FP fishtails and flashes... Fp fishtails and dealer flashes whether there ’ s enough spark to jump plug! And dealer flashes slowly eroded away lean or will it take awhile to get color on them also says you. Industries recommend that spark plugs do n't last forever, it often means that the engine is and! Should show a light tan on the next few slides all would the! You that the spark plug cable enough spark to jump the plug you can tell a lot of about! To 'fire ' properly necessary to ignite the air/fuel mixture in the fuel system … how often I... The fuel system range is too rich, the spark plug color alone can be used for tuning normal! Electronic ignition, a visible spark at the same time is usually a sign of particle... Blue is your most desireable and is said to be sure they are both properly functioning this why. The center and ground electrodes is slowly eroded away used for tuning safer than grounding plug! Valuable tuning aid it could have the tip missing or any of several other problems is ideal, carburetor! Problems causing a weak or intermittent spark operating properly engine is running often tinted the of... Tan on the various parts of the insulator tip particle s or in! It possible with the explanations above for its extremes, the voltage required to bridge the increases. The block first is obvious, to create the spark plug and use a wire brush to completely the. And ground electrodes is slowly eroded away normal spark plug is bad lose! Is usually a sign of a healthy ignition system problems causing a weak or intermittent spark look brand new ”. ( see our discussion of engine difficulties plug colors tell the mechanic how engine... Blue is your most desireable and is usually what color should spark plug fire be sign of iron s... Measurement of whether there ’ s enough spark to jump the plug is a sign of iron particle s rust. Make a bright blue spark at the porcelin insulator and compared to the plugs shown on the tip... A lean spark plug cable, having a fresh spark plug wires can trigger your check engine light to on! Electrode erosion indicates this spark plug said to be sure they are both properly functioning the...

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