Diagnosing spark plugs
11-16-2001, 03:29 PM
#1
Racer
Thread Starter
Member Since: Sep 2000
Location: Wildwood IL
Posts: 287
Likes: 0
Received 0 Likes
on
0 Posts
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]
11-16-2001, 03:38 PM
#2
Melting Slicks
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]
11-16-2001, 03:53 PM
#3
Racer
Thread Starter
Member Since: Sep 2000
Location: Wildwood IL
Posts: 287
Likes: 0
Received 0 Likes
on
0 Posts
Re: Diagnosing spark plugs (71coupe)
Yes, but more white than tan or brown. Not gunked up, broken or otherwise worn. They are 4 months and 3k miles old.
11-16-2001, 03:57 PM
#4
Melting Slicks
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]
