If they are within a couple of 1/1000ths they should be fine. The slightest difference in the part number could be a large difference in gap distance. I think you need to be careful when you buy spark plugs. I found my previous information on another manufacturer's website. I think there is misinformation even from the manufacturers. So, if you are going to gap them, only adjust the ground electrode. I can tell you nobody gaps the plugs, though. The manufacturer of your vehicle, the company that produced the aftermarket products you've used and/or your mechanic are all additional sources of gapping information if you've modified your vehicle. If you have any questions, please contact the NGK Sparkplugs Tech Staff: However, when you add a high power ignition system (such as those offered by MSD, Crane, Nology) you can open the gap from. As an example, when you raise compression or add forced induction (a turbo system, nitrous or supercharger kit) you must reduce the gap (about. The gap should be adjusted by only moving the ground electrode.Īnother consideration that should be taken into account is the extent of any modifications that you may have made to the engine. If adjusting the gap on fine wire or precious metal plugs such as platinum or iridium be very careful not to apply any pressure or prying force to the fine wire center electrode or insulator as they can be damaged. It is always best to check the gap against the manufacturer's specifications. The incorrect plug gap for your engine can contribute to a high rate of misfires, loss of power, plug fouling, poor fuel economy, and accelerated plug wear. Although the NGK factory will set the gap to a pre-selected setting, this may not be the right gap for your particular engine. A spark plug part number might fit hundreds of different engines from many different manufacturers. Q: Do I need to set the "gap" when installing a new set of plugs?Ī: Maybe. If you're diagnosing an issue on your own, you have to be willing to get the tools and put in the time to solve it. If you REALLY screw up a new plug is only $10, but screwing up is how you learn. Checking the gap is easy, you literally just use the same technique as the video above and don't press on the center electrode. If need be you can just unhook the whole frame holding the ignition wires and pull the coils with the plugs still attached. The caps can be replaced easily ($14/ea on Amazon, cheaper on eBay), and make sure you're using the correct technique to remove them. I spent $6 for the "fancy" one with 8 wire gauges and 12 blade gauges from Advance ( HERE). It can cause a case of the herky jerky, not to the extent to which you're describing but it's probably not helping things either. Unless you're heavily modded or something you don't run the risk of damage or anything, but you won't be getting the best performance out of your car when you decide to flog it either. Misfires are the main effect, which affects the gas mileage.
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