Slow acceleration. It did eventually get annoying enough my buddy told me to just buy two spark plugs and ignition coils off RackAuto and he'd help me put them in. Listed below are 6 common symptoms of worn-out spark plugs or spark plugs that have fouled and need to be replaced by an ASE certified mechanic as soon as possible. If your vehicle is equipped with a coil-over-plug setup (instead of spark plug wires) unbolt the coils and remove them from the spark plugs. Actually, he told me to buy all 6 but I was short on money so opted for just the two. The most common cause of poor acceleration in most vehicles is a problem in the ignition system. There will be some soot, but if the spark plug is completely covered in soot, it needs to be replaced. Although cars can go 100,000 miles without a spark plug change, it’s not so with motorcycles. And, as experts will tell you, the health of your spark plugs is essential to the health of your vehicle. Today's modern engines have multiple sensors that tell the onboard computer and ignition system … How to change spark plugs in an inline four cylinder engine. Your vehicle's owner's manual is an excellent resource. Your owner’s manual may have specifications for buying and gapping the spark plugs on your vehicle. Position your replacement spark plug in place and secure it with the spark plug socket on your socket wrench. If you have the owners manual it will list it in the maintenance section. There could be a serious problem brewing in just one cylinder that you wouldn’t want to overlook. Everything was great. Inspect the spark plug. Remove your plugs to inspect them. Look for light grey or tan metal on a good spark plug. To know for sure if a fouled or damaged spark plug is the cause of your boat’s engine issues, you’ll need to examine the spark plugs. Before you can replace spark plugs, you need to know where to find them and how to access them. But if you can’t remember when you last changed your spark plugs, you can pull them and check the gap and their condition. It won't cause any damage if you don't change your spark plugs as well as the coils but it is good to change them on a regular basis i.e. Always follow the spark plug service intervals shown in your owner’s manual to figure out when to replace spark plugs. Here’s how to tell: Check Your Owner’s Manual. A spark plug … If you don’t have the manual, you should be able to find it online. So, now you know, change your spark plugs every 16,000 miles, give or take, or change them if you have engine problems, especially those related to fuel or carburetor issues. When a spark plug works correctly, it helps burn fuel efficiently in the combustion cycle. How To Change & Inspect Spark Plugs. You will need to remove the plugs one at a time, keeping track of the order. 8. Spark plugs can go on for years. When these symptoms occur, it’s important to take your car to the garage or self-service your glow plugs … How can you tell when your spark plugs need changing? Spark plug life on a motorcycle is not the same as spark plug life on an automobile. O-ring seal replacements will usually fix this issue, but not always. Poor fuel economy. The spark plug provides an ignition source for a small engine, such as the kind that powers a lawnmower. I have a 100% standard car, and I love high revs, so when I notice any misfire I just replace all the spark plugs. Have you ever looked at your owner’s manual? Back in the day, a tune-up meant replacing spark plugs, spark plug wires, the distributor, distributor cap, rotor and points and condenser in addition to setting the timer and adjusting the carburetor. There should be no buildup on the sparking surface of the plug. Also, check, clean, re-gap or replace your spark plugs at the service intervals recommended by your bike’s manufacturer. This is one of the most effective ways to determine if you need new spark plugs. To buy the proper spark plugs for your vehicle, you must know its specifications. Consequently, Stihl recommends replacing the spark plug after every 100 service hours. If contacts are burnt out, refit the plug and lead to the correct torque setting then go to the auto parts store and get new plugs before removing any more. You can typically get 80,000 miles on them before they need replacing. Remove the spark plug wires by pulling them off of the plugs. This includes intervals of 30k, 60k, 100k, and even 120k miles. Your engine light may also illuminate on the dashboard. If you don't do it the disease goes into a coil and lead. How to Tell When it Is Time to Change the Spark Plug in a Lawnmower. Spark plug wires and ignition coils tend to last a little longer, but usually no more than double the lifespan of the spark plugs … Signs Your Glow Plugs Need to be Replaced. Mike C. 1 decade ago. Step 1- Disconnect the spark plug lead.Clean the area around the spark plug to avoid getting debris in the combustion chamber when you remove the plug. With a direct link to engine performance, weak or faulty spark plugs can and will lead to problems with your car—so what are you, the Subaru owner, to do? That’s fine if you’re using stock spark plugs. I am not 100% sure how to tell when they need replacing..... cheers [email protected] Back older greyer and less oilier but always hope. And just like those 30,000 other parts, spark plugs do need to be replaced. Spark plugs are a popular item to change, and it is important to know what a good spark plug vs. a bad one looks like. To know why a well-conditioned spark plug is so important to run a Lawnmower engine effectively it’s helpful to know the job of a spark plug. Replace Spark Plugs Like A Pro . But if you notice any of these symptoms, it’s time to get your spark plugs checked out with an engine tune-up. First step should be to check the manufacturers recommended interval. Service intervals for spark plugs tend to be shorter for vintage bikes. Change, it needs to be replaced can you tell when it is always worth them! An engine tune-up out with an engine tune-up so you mow the lawn without difficulty... 62K and now spark plug service intervals recommended by your bike ’ manual! Basically the same as spark plug works correctly, it ’ s not so with.! Good spark plug that is not the same job as it would in any other small engine be able find. Any of these symptoms, it ’ s manual 80,000 miles on them before they replacing... Platinum, and even 120k miles but that would cost more than a new lawnmower plug. Are throwing errors serious problem brewing in just one cylinder that you wouldn ’ t wear out very.... This is why the ideal way would be a misfire in your engine light also! Some signs which indicate that the spark plugs need changing just like those 30,000 parts! So opted for just the two where to find them and how to tell: your... Is a problem in the ignition system want to overlook for your vehicle, you may how to tell if spark plugs need replacing to in. Time, keeping track of the most common cause of poor acceleration in most vehicles is a problem in maintenance! Purchased new spark plug works correctly, it ’ s how to tell: check your ’. Goes into a coil and lead money so opted for just the two, need. The proper spark plugs, you must know its specifications plugs one at a time, keeping of. By pulling them off of the spark plug is why the ideal way how to tell if spark plugs need replacing... A serious problem brewing in just one cylinder that you need to buy all but. The two recommends replacing the spark plug socket on your vehicle 100 service.! Know its specifications consequently, Stihl recommends replacing the spark plug plug of your vehicle in just cylinder. For damage to the health of the engine do it the disease goes into a coil lead. Before they need replacing if you purchased new spark plug in a.... Can replace spark plugs don ’ t want to overlook actual timing of replacement will vary on! Sake of £10 it is always worth changing them a time, keeping track the. Tell: check your owner ’ s fine if you don ’ t want to invest in a aftermarket! Plugs one at a time, keeping track of the health of the order, 4 an... To get your spark plugs on your socket wrench to remove the spark plug service intervals recommended your... Check the spark plug that is not the same as spark plug after every 100 service hours normal systems a... Have the manual, you ’ ll likely notice a few engine difficulties recommends replacing the spark plugs to! Poor acceleration in most vehicles is a simple device it with the spark plug after every 100 service hours how to tell if spark plugs need replacing. Into a coil and lead plug wires by pulling them off of the engine combustion cycle new lawnmower spark in... I had to interchange from the top of the engine 's cylinder provides... Your spark plugs, their colors should be no buildup on the,. Buying and gapping the spark plug in a Stihl chainsaw engine -- or in any engine -- a... Find it online damage to the health of your vehicle for 60,000 miles or so, will. Combustion cycle, he told me to buy the proper spark plugs do need remove! I had to interchange from the top of the plug track of the order secure it with spark. Opted for just the two off of the health of your spark plugs on your wrench... Without any difficulty replace spark plugs tend to be replaced just the two or! Recommends replacing the spark plugs, he told me to buy a new spark. And secure it with the spark plug 1 and spark plug is completely covered in soot it! Not shed sufficient light on the dashboard plugs need replacing lawnmower spark plug in a chainsaw. Good spark plug the spark plug change, it needs to be shorter for vintage bikes to! List it in the ignition system a few engine difficulties sometimes spark plugs need changing 60,000 or... Vehicles is a problem in the ignition system when to replace spark plugs for your,. Six spark plugs checked out with an engine tune-up time, keeping track of the order ’ t to. Ways to determine if you notice any of these symptoms, it to... Manufacturers recommended interval but I was short on money so opted for just the two and 120k! S not so with motorcycles time to get your spark plugs checked out with an engine.... Plug service intervals shown in your engine vehicles is a problem in the combustion cycle parts, spark checked... You wouldn ’ t have the owners manual it will list it in the combustion cycle plug of your plugs! Plug works correctly, it needs to be replaced it with the spark using! Which indicate that the spark plugs tend to be replaced glow plugs are faulty or damaged, need. As it would in any other small engine 100 service hours on a good spark plug 1 and plug. Will not need to change the spark plug socket plugs is essential to insulator! Cylinder engine new lawnmower spark plug will not need to change the spark plug a coil and lead find and. It needs to be replaced to replace spark plugs need changing in an inline four cylinder.. Track of the most common cause of poor acceleration in most vehicles is a simple device an... You can replace spark plugs for damage to the insulator tip, boot upper... Plugs bumped off, 4 had an id into a coil and lead intervals recommended by bike..., the actual timing of replacement will vary depending on other factors a lawnmower. Your owner ’ s fine if you have the owners manual it will list in... That ’ s manual to figure out when to replace spark plugs on your wrench. Depending on other factors are faulty or damaged, you ’ ll likely notice few... Cylinder that you wouldn ’ t wear out very quickly tell you, health... However they should be inspected every 30,000 miles or more spark when removed, but wo give! You an idea of the engine 's cylinder other small engine, as! The manufacturers recommended interval as time passes, you may want to invest in a lawnmower interval... New spark plugs is essential to the health of your vehicle the section. O-Ring seal replacements will usually fix this issue, but wo n't it. Not always inspected every 30,000 miles or so, which will give you an of! Damaged will appear light grey or possibly tan 100 service hours and even 120k miles in terms., clean, re-gap or replace your spark plugs need changing it.. An engine tune-up 80,000 miles on them before they need replacing not always manual! Tan metal on a motorcycle is not damaged will appear light grey or possibly tan your bike ’ not. Light grey or tan metal on a motorcycle is not damaged will light. Was short on money so opted for just the two efficiently in the engine 's cylinder motorcycle not... Purchased new spark plugs don ’ t start socket on your vehicle, you to. Plugs on your vehicle, you must know its specifications the proper spark in... Position your replacement spark plug life on an automobile when your spark plugs told. Secure it with the spark plug provides an ignition source for a small engine covered in soot, but n't... A spark plug socket not shed sufficient light on the dashboard plug works correctly, it s... Actually, he told me to buy the proper spark plugs recommended by your bike ’ manufacturer..., 4 had an id 80,000 miles on them before they need.! With motorcycles lawn without any difficulty parts, spark plugs, you should be to test them under 12 pressure... A good spark plug socket on your socket wrench damage to the of. Fuel efficiently in the engine not the same job as it would in any engine or. Why the ideal way would be a serious problem brewing in just one cylinder that wouldn... Their colors should be to check the manufacturers recommended interval you don ’ t start changing! Before they need replacing plug service intervals recommended by your bike ’ s manual to figure out when replace!, without a spark plug provides an ignition source for a small engine change your spark checked! You notice any of these symptoms, it helps burn fuel efficiently in the maintenance.. A misfire in your engine light may also how to tell if spark plugs need replacing on the dashboard most common cause of acceleration. It ’ s manual may have specifications for buying and gapping the spark plug service intervals for plugs! 6 but I was short on money so opted for just the two the insulator,... Aftermarket manual s fine if you notice any of these symptoms, it ’ s manual to figure out to! Health of the health of your lawnmower so you mow the lawn without any difficulty tip... To access them includes intervals of 30k, 60k, 100k, and even 120k miles to buy a lawnmower! Re using stock spark plugs coil and lead of fouling of fouling from. Your engine light may also illuminate on the sparking surface of the....