Iridium plug replacements?
Race Director
Joined: Apr 2007
Posts: 11,150
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From: South Western Ontario
It's quite common to read that a plug should be finger tight and then tightened a 1/16 turn for a taper seat or a 1/2 turn for a gasket seat. So, yes, just make sure the tapered seat is touching the head and go 1/16 turn and you'll be fine.
Thread Starter
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Joined: Oct 2016
Posts: 95
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From: San Francisco CA
Thanks!
Thread Starter
Advanced
Joined: Oct 2016
Posts: 95
Likes: 6
From: San Francisco CA
Not to swerve out of lane here, but I am currently fighting with AC-Delco after purchasing 8 iridium plugs for my C5. I sent the rebate form in expecting to get $24 bucks. AC-D sent me a check for 3 dollars. I have sent them two emails that has so far gone unanswered. Buyer beware when it comes to their rebate program.
Good luck
Team Owner
Joined: Oct 1999
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From: Guinness Its whats for B'fast JAWGA
CI 3-4-5-9 Veteran
Bought it a couple years ago with 26K miles and doubt either of the previous owners ever changed the plugs as they were probably thinking in terms of milage (rated up to 100K) and didn't consider age. Personally I would never leave plugs in for 18 years and certainly won't in future.
Picked up a small pack of anti-sieze and will put a tiny film of on threads.
So looks like the plan (after days of trying to figure it out) is:
Gap em to .040
Slight film of antiseize on plug threads.
Torque to 11lbs or finger tight and 1/16th in turn on wrench.
Hope the change out doesn't take as long as figuring out best way to do what I thought was going to be straight forward and simple process. ;-)
Thanks to all for input and help.
Love this site!
Picked up a small pack of anti-sieze and will put a tiny film of on threads.
So looks like the plan (after days of trying to figure it out) is:
Gap em to .040
Slight film of antiseize on plug threads.
Torque to 11lbs or finger tight and 1/16th in turn on wrench.
Hope the change out doesn't take as long as figuring out best way to do what I thought was going to be straight forward and simple process. ;-)
Thanks to all for input and help.
Love this site!
The other side of that is if you are tuning in a car and changing plugs more often, do not put antiseize on at every plug change as it will build up on the cylinder head.`For the guys that don't put loads of miles between plug changes, many have turned good #s on standard copper NGK TR5s. I am running one of their Iridiums in my '01 2500HD 6.0 (LQ4).
Last edited by 93Polo; Sep 29, 2018 at 10:17 AM.
