My big fat car started to run smoother, a quieter idle and the throttle response become quicker on the foot. However, the advertising that accompanies the different types of spark plugs is potentially misleading, so it's important to recognize the real difference between the spark plugs in question. I didn't replace the spark plugs that were already in the 350 and they're at least 4 or 5 years old. Years ago while playing with a single cam 2L BMW on Webers and much modified, a 4Hp gain at the wheels difference was achieved with Splitfire plugs over new standard NGKs. i was jsut at autozone and saw these cool looking spark paugs. Incoming search terms: Do Spark Plugs Make A Difference,Do Expensive Spark Plugs Make A Difference,Are More Expensive Spark Plugs Better,Cheap Spark Plugs Vs Expensive,Are Expensive Spark Plugs Worth It. Copper core spark plugs are still the most commonly seen, however, and many people agree that they are the best. Do after market spark plugs make any difference to anthing?? Does it make a big difference in efficiency or are they all more or less the same for normal use. 02-03-2005, 11:47 PM. Iv heard of these irridium things or whatever they are, but was just wondering what difference, if any theyll have on a 1.3 Yaris? But for engine power to be generated from this mixture, it needs to be ignited by an electric current. Changing spark plugs could be a good idea when… 1. Xrrider280. Favorite Answer. Voltage builds in a ramp regardless of how the spark is generated. Spark plugs are responsible for producing […] When most people shop for spark plugs, they assume that all spark plugs are the same. No more delay in response! Your car’s engine basically runs on a series of miniature, contained explosions. The car is a 1.6L and is a low powered ordinary passenger car. ID88. It doesn't seem to me like it has the power it should. Well, manufacturers do try to push for the newest tech iridium spark plugs because they’re more expensive. they were $7.99 each and the box said increase horsepower, so … Engine Tests. Spark plugs serve a very important purpose for the internal combustion engine. So which is the best? If so what kind of spark plugs would be best for improving MPG / Fuel Efficiency on my 95 Ford Escort Wagon? There are brands of spark plugs that claim to add performance such as better MPG and even more HP. A single plug may be designed for several different engines, necessitating a … Because it's the little things that can make a big difference when it comes to performance—including your spark plugs Learn why it’s important to keep this part of your car in great working order and when to change spark plugs by watching for these bad spark plug symptoms. This advantage occurs because there is a faster response to your throttle operations. Spark plugs themselves are one of the most inexpensive components on a car. If I put iridium spark plugs, will it make a difference? You’ll be able to feel the difference immediately, especially if you have put some miles on your older plugs. Additionally, check the exterior condition of all spark plugs. I'm curious. An automobile is rarely silent about its problems. Automobile vehicles use spark plugs to ignite the air-fuel mixture inside the cylinder for the purpose of combustion. do expensive spark plugs make a difference in engine performance? Specially the watertight direct NGK spark plug connectors do make a difference, even if water comes in during a river crossing. While the concept of a spark plug is simple, they are required for your car to function reliably under extreme conditions. How often should I replace my spark plugs? Last, spark plugs – as the name implies – create a spark in the engine to ignite the fuel and air mixture. 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