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DIY Spark Plugs 04 GX 470

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Old 08-26-17, 10:03 PM
  #106  
FlexyLexi
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Just bought a GX470 from the original owner with 216k miles. He had all the service records from the dealer (90 pages!), and I couldn't find any evidence of the plugs ever having been changed . So, I decided I better do it. I went with the NGK iridium IX which was ~$7 a plug. There are more expensive iridium plugs but who knows what the difference between "laser" and "IX" is. Everything went pretty smoothly. Only tip I have is it would probably be slightly easier with a cool engine...I was playing hot potato with the plugs and plug wrench lol!
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Old 09-05-17, 09:23 AM
  #107  
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Originally Posted by FlexyLexi View Post
Just bought a GX470 from the original owner with 216k miles. He had all the service records from the dealer (90 pages!), and I couldn't find any evidence of the plugs ever having been changed . So, I decided I better do it. I went with the NGK iridium IX which was ~$7 a plug. There are more expensive iridium plugs but who knows what the difference between "laser" and "IX" is. Everything went pretty smoothly. Only tip I have is it would probably be slightly easier with a cool engine...I was playing hot potato with the plugs and plug wrench lol!
I was amazed that the spark plugs last so long for the rig. I had my original ones replaced for the 1st time recently at about 215K miles when I had my timing belt done. Most of the mileage are freeway miles so not sure if that help with the longevity.
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Old 09-05-17, 05:46 PM
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Mine seemed to be in decent shape too. Still probably a good idea to change them more frequently-you don't want them to get seized in the engine block!
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Old 10-03-17, 08:33 AM
  #109  
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Just replaced my plugs last night. Took me about 2.5 hours to complete. I took my time doing it and wasn't in any hurry. I cleaned up all the connectors and added dielectric grease for a nice, secure connection. The original plugs were NGK laser Iridium's. I replaced them withDenso SK20R11. When I first started up the car it started revving up high around 2.5k RPMs and started to fluctuate from low to high. I thought I broke something. Eventually it settled down around 1k. I took it for a little spin and it seemed a little peppier. I also cleaned out the throttle body while I had the intake off. One less task for me to complete.
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Old 10-10-17, 06:23 AM
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Nice write up - OEM plugs is the way to go (NGK/Denso)! Definitely do this on a cool engine, if the heads are hot, and the plug threads are softer, you run an increased risk of cross-threading them if inserted wrong.
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