Spark Plug Experts, Help

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Aug 8, 2007 | 09:00 PM

dave_85

Thread Starter

Pro

Joined: Dec 2002

Posts: 522

Likes: 3

From: Rolling Meadows IL

Spark Plug Experts, Help

What cause my plugs to look like this?
http://new.photos.yahoo.com/davidbl2...804440064756/0

My Vette is an 85 with iron Pro Topline heads. Max advance is 32degrees.

Last edited by dave_85; Aug 8, 2007 at 09:30 PM.

Aug 8, 2007 | 09:04 PM

Curveit

Drifting

Joined: Feb 2003

Posts: 1,978

Likes: 2

From: San Antonio Texas

All I get is a RED X Dave...

Aug 8, 2007 | 09:32 PM

dave_85

Thread Starter

Pro

Joined: Dec 2002

Posts: 522

Likes: 3

From: Rolling Meadows IL

Last edited by dave_85; Aug 8, 2007 at 10:02 PM.

Aug 9, 2007 | 12:43 AM

John A. Marker

Le Mans Master

Joined: Mar 2004

Posts: 5,107

Likes: 171

From: Dublin CA

Looks like OIL. Might be time to change valve seals. Plug is not covered with oil, so that is good. Are all the plugs like this?

Aug 9, 2007 | 07:33 AM

newbecorvetteguy

Melting Slicks

Joined: Jul 2004

Posts: 2,018

Likes: 1

From: OR

Cause what exactly? The oil on the threads is from an external source. The plug looks pretty new, has good sharp corners. That dark shadow just looks like it hasn't ran long enough to burn off the extra fuel the from last cold start to me. The spark probably originates from the cleaner looking area on the plug. I don't think there's anything there that needs correcting. That's my SWAG anyway.

Aug 9, 2007 | 08:24 AM

KeyWestJack

Pro

Joined: May 2006

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From: Pittsburgh PA

Aug 9, 2007 | 08:31 AM

vetteblack

Burning Brakes

Joined: Aug 2006

Posts: 1,189

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From: Houston PA

Id have concern over the white insulator, looks burnt? Too hot perhaps? How many miles are on it.

Aug 9, 2007 | 09:20 AM

dave_85

Thread Starter

Pro

Joined: Dec 2002

Posts: 522

Likes: 3

From: Rolling Meadows IL

The plug has about 500mi. on it. They all look like that. I get the dark pattern on the one side of the tip in like a day. The valve seals are good. No cloud of smoke on start up.

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Aug 9, 2007 | 11:09 AM

'Shifter

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Spark looks like it might be a tad weak...how does your cap/rotor look? Any dusting from ionization, or
blackened contacts on your cap, or pitting on teh rotor? How about teh carbon brush? Wires good-not
stiff? Check ohm resistance on teh wires....

Aug 9, 2007 | 11:12 AM

#10

rick lambert

Le Mans Master

Joined: Oct 2003

Posts: 6,130

Likes: 2

From: seattle WA

I don't think I'd be concerned...at this point, plug looks pretty good, but I'd probably pull one after 5000, just to make sure I wasn't getting oil fouled. Here's a good site for you to take a look at.

http://www.dansmc.com/Spark_Plugs/Sp...s_catalog.html

BTW, what type of plugs are you using?