Diagnosing spark plugs
Thread Starter
Racer
Joined: Sep 2000
Posts: 287
Likes: 0
From: Wildwood IL
Diagnosing spark plugs
I have looked at every manual I have for diagnosing spark plugs, including the GM service manual, and none have a description of what I see when I pulled my plugs. The electrode (is that the piece that bends over the tip?) is very white. No deposits or anything, just very white. Whazzup with that? Running too lean? Too hot in the combustion chamber? I pulled 3 plugs (the easiest) and all were the same. Opinions? thx, tom
[Modified by trs77, 1:30 PM 11/16/2001]
[Modified by trs77, 1:30 PM 11/16/2001]
Melting Slicks
Joined: Jun 2001
Posts: 2,429
Likes: 14
From: CA
Re: Diagnosing spark plugs (trs77)
Does it look like this?
Also check this link
http://www.ngksparkplugs.com/techinf...q/faqread2.asp
[Modified by 71coupe, 11:41 AM 11/16/2001]
Also check this link
http://www.ngksparkplugs.com/techinf...q/faqread2.asp
[Modified by 71coupe, 11:41 AM 11/16/2001]
Melting Slicks
Joined: Jun 2001
Posts: 2,429
Likes: 14
From: CA
Re: Diagnosing spark plugs (trs77)
It's hard to tell without actually seeing them. If you look at the center electrode insulator (the porcelin part) do you see any small dark shiny specs or little *****? You may need to get out a light & magnifing glass to check this.
[Modified by 71coupe, 12:00 PM 11/16/2001]
[Modified by 71coupe, 12:00 PM 11/16/2001]
