Spark plugs for 99 C5 Base Coupe

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Apr 9, 2014 | 09:43 AM

ArtGle

Thread Starter

Burning Brakes

Joined: Oct 2013

Posts: 1,030

Likes: 72

From: Seminole, FL

Spark plugs for 99 C5 Base Coupe

I KNOW this is beyond stupid questions time, but I looked in the newbie and tech posts at the top and didn't see it mentioned.

I see different kinds of plugs available, and I'd rather stay with AC Delco, (am I right?), but somehow "COPPER" just doesn't sound right for this engine.

Any takers???

Thanks in advance.

Apr 9, 2014 | 11:12 AM

MAC5

Drifting

Joined: Feb 2003

Posts: 1,761

Likes: 235

From: North Carolina

Quote:

Originally Posted by ArtGle

The stock plug is ACDelco 41-110 (Iridium) and are pregapped to .040

Get prepared for numerous alternatives.

Last edited by MAC5; Apr 9, 2014 at 11:17 AM.

Apr 9, 2014 | 11:34 AM

c4gone

Drifting

Joined: Mar 2012

Posts: 1,959

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From: Victoria tx

I use iridiums in my 99.

Apr 9, 2014 | 12:17 PM

EMT311

Intermediate

Joined: Feb 2014

Posts: 31

Likes: 2

From: Valley Center CA

I just had the plugs and wires changed after 128k miles. The mechanic showed me the plugs and they didn't look bad for the originals from the factory. No oil or uneven electrode wear. Had them put the AC Delco Platinum's back in with new wires. Counting on these one to last just as long.

Apr 9, 2014 | 06:02 PM

baxsom

Le Mans Master

Joined: Jun 2008

Posts: 5,284

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From: Rockledge FL

The iridium is for longevity. Copper plugs are used in the performance applications but need to be changed out quicker. The most popular is the NGK TR55.

Apr 9, 2014 | 11:25 PM

LoneStarFRC

Team Owner

Joined: May 2001

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From: Dear Karma, I have a list of people you missed.

St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16

Quote:

Originally Posted by MAC5

The stock plug is ACDelco 41-110 (Iridium) and are pregapped to .040...........

The Delco iridiums are fine.

Apr 11, 2014 | 07:34 PM

johnson-rod

Melting Slicks

Joined: Oct 2007

Posts: 2,375

Likes: 426

I put in Delco iridiums about 100K ago. They are still fine. Wires are a little dusty.

Apr 12, 2014 | 08:32 AM

stein3282

Instructor

Joined: Nov 2011

Posts: 115

Likes: 2

From: New Orleans

Quote:

Originally Posted by baxsom

The iridium is for longevity. Copper plugs are used in the performance applications but need to be changed out quicker. The most popular is the NGK TR55.

I run the NGK 55. Just know I have to change them out every so often.
I did just pull my factory iridiums out of my 2001 with 130K. They looked great.