Plugs
Safety Car
Joined: Sep 2001
Posts: 4,411
Likes: 1
From: Wilmington NC
Originally Posted by harleyvette
Got 50,000 mi. on my 98 c5 is it time for new plugs?
What brand is best and should I change wires?
What brand is best and should I change wires?
The TR55IX NGK irridium plugs are quite good. It used to be that you had to choose between long life and performance, but from my reading, it appears that because of the small size on the iridium profile you get both.
http://www.sparkplugs.com/
Unless you see some physical damage with the plug wires they should be fine. They, usually test around 300 ohms and Chevy says don't replace them unless they go over 700.
Advanced
Joined: Apr 2004
Posts: 82
Likes: 0
From: Ellisville MO
Originally Posted by harleyvette
Got 50,000 mi. on my 98 c5 is it time for new plugs?
What brand is best and should I change wires?
What brand is best and should I change wires?
I went with a MSD wire set and Bosch PlatinumX4 plugs (pre-gapped)and have been pleased with the results.
Watch out for that #7 plug...its a real pain in the *** to get to.
My solution?...a breaker bar, six inch extension and a double -swivel plug socket!
David
Race Director
Joined: May 2001
Posts: 15,318
Likes: 2,066
From: Guelph, Ontario
I just had my 98 dyno tuned, and even with only 33k on the car, the plugs were pretty bad. Autotap showed us it was getting 7 degrees of KR, so I pulled a plug and it looked pretty bad, the gaps were way too high. So I put in fresh plugs and instantly the KR went to zero. The stock plugs just suck. Go with NGK TR55s at a .050 gap and you'll be laughing. Plugs are so super easy to change on the C5 too, it's a half hour job or less. I'll be changing my plugs once per year from now on, maybe even twice per year.
Melting Slicks
Joined: Jan 2003
Posts: 3,251
Likes: 4
Originally Posted by harleyvette
Got 50,000 mi. on my 98 c5 is it time for new plugs?
What brand is best and should I change wires?
What brand is best and should I change wires?
Then I went SC'd. I kept the plugs in case I go back to stock. At $7 per plug and only 5k miles on them, it's worth keeping.
Even tho, in all likihood I'm permanently blown. I can't imagine not having a blower. Yee haa!
