For this reason, plugs need to be replaced to ensure that a spark is reliably created. If you want long-lasting plugs that will reduce the work you need to do replacing plugs and don’t mind paying extra for that luxury, yes. It really applies to any modern vehicle, but in my case an Alfa 147 1.6 TS has 8 plugs costing about £60 in total. Noble metal plugs can perform consistently and well, which helps to maintain the engineered performance of the engine. Dont change your spark plugs because you may think it will make a difference it wont -- 32,000 as Mr motorboy says. If the plugs fail sooner than the recommended interval, it’s important to solve the problem before installing new plugs. Spark plug changes also are more frequent on the turbo 2.0-liter: every 45,000 miles or three years versus 105,000 miles or seven years on the 2.4-liter engine. - 1. E-Catalogue Find your automotive parts. Some engines require that the intake manifold be removed while replacing spark plugs. Spark plugs can have platinum cores, copper cores, and even be nickel-plated. I have seen it happen and the first time I saw it it was difficult to find, because it is the last thing you would expect. So, what spark plug to put in the car? For a very long time, only copper spark plugs were available. What gives? The average cost to remove and replace the cylinder head on a 4 -stroke Jetski runs over $400 + all those expensive gaskets that must be replaced. As engines became more powerful and reliable, the conditions in the combustion chamber became more stressful. The energy is created by the ignition coil or coil pack, which builds voltage until the spark occurs between the two electrodes. But if you are hoping to improve the performance of your car, your money will be better spent elsewhere. Unless you are driving a diesel, spark plugs are a fairly important, but do you need to upgrade them? It will take only an hour to change your spark plug. Definitely change the plugs one way or another, I'm only suggesting doing it yourself if you want to save a little $. 17 Jan 2013, 16:25 Two of the plugs are easy the other two are a bit of a pig with access etc, you will also need a slim spark plug socket with an extension as well or it won't go down the hole, mine wouldn't and I had to go and get one that fitted. A Honda Pilot Spark Plug Replacement costs between $165 and $335 on average. Most cars have one plug per cylinder, so a four-cylinder engine will have four plugs, a six-cylinder engine will have six plugs, and so forth. Thanks. Is it worth the investment? You'll probably spend about the same over the long haul with iridium but platinum and copper actually give a bigger spark, especially copper and that can translate to more complete combustion and better performance. They are more durable than copper simply because platinum is a harder metal in comparison, so it doesnât erode as quickly. The engine has not changed. ... a difficult to replace plug. Whatâs the deal with platinum ultra super duper (expensive) spark plugs versus standard plugs? @ your mileage you may want to have the carbon cleaned out in the top end, try to use tier-1 gas. More importantly, are they worth the extra cost? They won’t make the engine perform better than it did when it was new, but they will help it stay at that level longer. Wearing of the central electrode reduces the strength of the ionization and increases the amount of voltage required to create the spark. Is this right? they looked up the IMR-9d9h and found an autolite cross reference at 2.09 a piece and a NGK cross reference at 14.99. Bit of a surprise to hear from tonytan that even the original plugs are half denso and half NGK, I suppose it makes no difference for the engine since my GD been on that for at least a year. Platinum spark plugs are certainly more durable than copper spark plugs. 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