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Author Topic:   What I found on my spark plugs
rockafellz
Gearhead

Posts: 1348
From: San Lorenzo, CA, USA
Registered: Aug 2001

posted 04-24-2003 12:07 PM     Click Here to See the Profile for rockafellz   Click Here to Email rockafellz     Edit/Delete Message   Reply w/Quote
Well, I swapped out my plugs a few days ago and the bottom of the threads had oil on them. The tip and porecelin were dry. The porecelin was tannish in color with very little specs. The top ring of the plug was somewhat black/brown.

What does this all mean?

I'm a little concerned about the oil on the bottom part of the threads.

The car has about 300-350 miles on it. It does NOT smoke. To my knowledge the valve covers do not leak. Are the rings still seating?

Thanks in advance.

Erik

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1966 Ford Mustang 2+2
Mine - Restomod in Progress

1966 Ford Mustang Coupe
Dad's - Original Unrestored

[This message has been edited by rockafellz (edited 04-24-2003).]

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Toronado3800
Gearhead

Posts: 364
From: St. Louis, MO
Registered: Jul 2001

posted 04-24-2003 10:30 PM     Click Here to See the Profile for Toronado3800     Edit/Delete Message   Reply w/Quote
Not sure. Diagnosis is my weakness. I can think of two posibilities:

1 The oil was put on during assembly. I had a motor with anti-sieze on the plugs once.

2 Oil is in the chamber buts its being burn off the parts of the plugs exposed to the combustion chambers.

On my Spark Plug poster tannish is labeled hot.

Just my guess. I'm going to be reading other people's posts to find out myself.

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johnmustang
Gearhead

Posts: 5144
From: British Columbia , Canada
Registered: Nov 2001

posted 04-24-2003 10:35 PM     Click Here to See the Profile for johnmustang   Click Here to Email johnmustang     Edit/Delete Message   Reply w/Quote
ERIK,

Hopefully this will help you out.

http://cochise.uia.net/pkelley2/sparkplugreading.html

JOHN

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65 2+2 FASTBACK
87 TAURUS WAGON
98 F150 XLT TRITON V8 4.6, 4 WHEEL DRIVE
Member:Vancouver Island Mustang Association
M&M #1710
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