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05 LegacyGT

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  • Location
    Cincinnati, OH
  • Car
    05 LGT 5MT - stage 1
  • Occupation
    College student

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  1. You don't need to use a cooler plug for higher altitude. Your car's ECU reads how much air is going into the engine and supplies the right amount of fuel to maintain the correct air to fuel ratio. So, since the air is thinner, it will supply less fuel, but you don't need a colder plug.
  2. Did mine last night. It really wasn't as difficult as I was expecting it to be. This was my first time changing spark plugs in a car and I was taking my time, so it took me a little over 3 hours from getting all the tools out to starting the car to go for a test drive. It does seem to run a little smoother than it did before. I don't know how long the old plugs had been in there because I just bought my car and didn't get a very detailed service history, but they did look pretty bad so I'm glad I did it. The only problem I ran into was that the clip on the wire harness for cylinder #3 coil pack snapped off when I pushed in on it to unplug it. I just put a zip-tie around it to hold it on and will check back in a couple of days to make sure the zip-tie is holding up to the heat. I highly recommend lubricating the threads on the new plugs because it makes it much easier to thread them in by hand and it's easier to tell when the crush washer is seated against the cylinder head. Thank you Boxer for writing the walkthrough and thank you to everyone else for all the tips!
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