Spark plugs threads covered in Oil - Chevy Impala SS Forum
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 16 (permalink) Old 08-08-2019, 11:50 AM Thread Starter
Member
 
cadejohnson58's Avatar
 
Join Date: Apr 2015
Posts: 80
 
Spark plugs threads covered in Oil

Hey all I took out all of my spark plugs for a good read and all of them had oil up the threads, this is #1 cylinder and the ground strap and electrode have a tan burn mark which to me seems fine, I just wanted to know if anyone else has had this problem, I should check the PCV valve probably to see if it rattles (good) or not (Bad) thank you, no rush.
https://i.imgur.com/JX8rDMd.jpg
cadejohnson58 is offline  
Sponsored Links
Advertisement
 
post #2 of 16 (permalink) Old 08-08-2019, 12:05 PM
Senior Member
 
Join Date: Apr 2001
Location: Moorpark, CA
Posts: 8,430
 
Garage
what gap is that plug?

\'96 BBB 383/T-56
BALLSS is offline  
post #3 of 16 (permalink) Old 08-08-2019, 12:08 PM Thread Starter
Member
 
cadejohnson58's Avatar
 
Join Date: Apr 2015
Posts: 80
 
0.050" sir all of them.
cadejohnson58 is offline  
 
post #4 of 16 (permalink) Old 08-08-2019, 12:54 PM
Senior Member
 
Join Date: Apr 2001
Location: Moorpark, CA
Posts: 8,430
 
Garage
worn rings and or valve stem seals can cause oil to get into combustion chamber and on plug threads. Yours does not look like any big deal.

How many miles on the motor?

If one or more cyl did have oil covered tip/strap than that would be more of a concern where you would want to do a compression test to compare cyl.

check the PCV (read clean it with some carb cleaner even if it rattles)

\'96 BBB 383/T-56
BALLSS is offline  
post #5 of 16 (permalink) Old 08-08-2019, 05:06 PM
Junior Member
 
Join Date: Jan 2009
Location: Pittsburgh
Posts: 29
 
Could that oil be from the outside? Like leaky valve cover gaskets? Or leaky intake/china wall? Intake leaks can make oil run everywhere. If you think it's coming from the combustion chamber, any smoke? If not, then I wouldn't worry too much. But I would definitely look for signs of external leaks. +1 on the compression test and leakdown test if you see more coking/deposits on the tip of other plugs or if you really want to be paranoid.

-- Tom
2011 Caprice PPV
1995 Impala SS
1994 Caprice 9C1 LT1
1995 Caprice 9C1 LT1
1995 Caprice Wagon
1972 Chrysler Newport 2-door
1969 C30 Flatbed
1969 Dodge Charger

storm9c1 is offline  
post #6 of 16 (permalink) Old 08-08-2019, 05:22 PM Thread Starter
Member
 
cadejohnson58's Avatar
 
Join Date: Apr 2015
Posts: 80
 
138,000 on a untouched street engine. I'm positive almost all spark plugs had oil on them. On some start ups it would immediately show smoke then go away and never happen while running.
cadejohnson58 is offline  
post #7 of 16 (permalink) Old 08-08-2019, 05:25 PM
Junior Member
 
Join Date: Jan 2009
Location: Pittsburgh
Posts: 29
 
Smoke on startup... ok then that eliminates my outside leak theory. There is definitely oil in the combustion chamber. Certainly check the PCV valve. And it sounds like you have bad valve guides, smoke at startup... then clears up... classic symptom. A bad or clogged PCV valve will make it worse.

-- Tom
2011 Caprice PPV
1995 Impala SS
1994 Caprice 9C1 LT1
1995 Caprice 9C1 LT1
1995 Caprice Wagon
1972 Chrysler Newport 2-door
1969 C30 Flatbed
1969 Dodge Charger


Last edited by storm9c1; 08-08-2019 at 05:27 PM.
storm9c1 is offline  
post #8 of 16 (permalink) Old 08-08-2019, 05:26 PM Thread Starter
Member
 
cadejohnson58's Avatar
 
Join Date: Apr 2015
Posts: 80
 
It could come from the outside as this engine has always had a bad engine oil leak. I've done the oil pan gasket, front timing cover seals. I'm the second owner so I dont think anyone re did the intake manifold china wall silicone seal. If I start my car in the garage and drive it out there was a oil drip half the size of a dime pretty fast.
cadejohnson58 is offline  
post #9 of 16 (permalink) Old 08-08-2019, 05:29 PM Thread Starter
Member
 
cadejohnson58's Avatar
 
Join Date: Apr 2015
Posts: 80
 
Valve stem seals makes sense definitely at this mileage and the thousands of hours operating, this engine is probably due. It still runs good, I have aluminum heads and an intake in my garage I think I should start working on.
cadejohnson58 is offline  
post #10 of 16 (permalink) Old 08-08-2019, 08:00 PM
Senior Member
 
95wagon's Avatar
 
Join Date: Jul 2001
Location: Vancouver B.C. Canada
Posts: 4,464
 
The LT1, it is common for the intake to head gasket and hardware to relax and suck oil from the valley into the bottom of the ports.

The Corteco- Detroit Gasket is pretty hard even new and just a little release of tension they can leak.

Try checking all the intake bolts ( some have nuts on top holding brackets you will have to remove)

Might not be your issue, but free to try .


The First
LS7 T56 6 Speed Wagon
Katech cam , 550 rwhp
11.79 @ 120.65


LS7 T56 drag video
My Wagon
My W-31 Cutlass
95wagon is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevy Impala SS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome