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. PM was sent to thread starter of its relocation.Misfires are the main effect, which affects the gas mileage. Moderators Note: The thread "Spark Plug Gap Discrepancy" has been moved to the Engine and Drivetrain Forum for better exposure and replies. PM was sent to thread starter of its relocation. I know too much gap is just as bad as too little gap. 027 there is a clear difference in these gaps here. So what gives here? Should I just install them out of the box? The manual and various websites state the gap to be. He even told me that that's how they do it, the techs just install them right out of the box! He told me that all Toyota plugs are pre-gapped and ready to be installed. I asked in the service department to see what they had to say and one of the service writers flagged down a tech and asked him. I then asked if there were any other Toyota models that called for this same plug and he said yes! So I looked into it and about 5 or so other Toyota vehicles use this plug and the gap ranges go from. The guy said yes they are ready to be installed as they are pre gapped (he didn't have the gap specs there and he told me if I wanted that information to talk to someone in service). Again, I asked if these plugs were pre gapped and what the gap is supposed to be. So, the next day I went back to the dealer, since I had to return the cracked one anyway, I decided to double check on this "pre-gapped" plug. 027 The Tundra owners manual calls for a. While I had the plug there in my hand, I decided to verify it's gap. I went home to install them and of course the first one out of the box was cracked, it was too late to go back and exchange them so I decided to wait till the next day. I bought replacement plugs from the dealer (Denso K20R-U) and I asked if they were pre gapped. Ok I have a question regarding the acutal plug gap for the tundra V8.
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