• Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

Burning a good bit of oil...

  • Thread starter Thread starter cooter_11
  • Start date Start date Mar 20, 2007
C

cooter_11

Member
Apr 22, 2005
138
0
16
GA
Mar 20, 2007
#1
  • Mar 20, 2007
  • #1
Well at the title states I've been burning a good bit of oil lately. It's burned oil ever since I bought the car, but it seems to be quite a bit worse lately. I think it's the valve stem seals because it really poofs smoke when it's been idling for a little bit and I hit the gas. And on startup it will poof smoke.

How do I definetly tell it's those and not something else like piston rings? Is there any diagnostic test??

Once I get my tax return money back, I plan on installing VT stage II cams and valvesprings and such, so I'm gonna replace the valvestem seals while I'm in there. Is there any special tools that I will need or what tool do yall recommend using to do them with? What tool do you compress the valve springs with? Is it at all possible to do this with the heads on the car or do I need to take them off?

Sorry for all the questions, I just wanna make sure I have this thing nailed before I get balls deep and realize I gotta buy something else. Thanks for the help fellas.
 
D

Dragstr05

New Member
Dec 21, 2004
643
1
0
40
Stafford VA
Mar 20, 2007
#2
  • Mar 20, 2007
  • #2
Based on the info you provided, it deffinately sounds like valve seals.
 

the98stang

Active Member
Aug 12, 2005
2,408
0
47
39
Clovis, CA
Mar 20, 2007
#3
  • Mar 20, 2007
  • #3
cooter_11 said:
Well at the title states I've been burning a good bit of oil lately. It's burned oil ever since I bought the car, but it seems to be quite a bit worse lately. I think it's the valve stem seals because it really poofs smoke when it's been idling for a little bit and I hit the gas. And on startup it will poof smoke.

How do I definetly tell it's those and not something else like piston rings? Is there any diagnostic test??

Once I get my tax return money back, I plan on installing VT stage II cams and valvesprings and such, so I'm gonna replace the valvestem seals while I'm in there. Is there any special tools that I will need or what tool do yall recommend using to do them with? What tool do you compress the valve springs with? Is it at all possible to do this with the heads on the car or do I need to take them off?

Sorry for all the questions, I just wanna make sure I have this thing nailed before I get balls deep and realize I gotta buy something else. Thanks for the help fellas.
Click to expand...

Could be the rings as well. How many miles are on the engine? What weight oil are you using? You can do a compression test to see if the rings are bad. If the compression is low, add a cap of oil into the cyclinder. Let it sit for a few minutes. If you test the same cylinder again and the compression goes up, your rings are bad. If the smoke comes out the back on deceleration (dropping RPM) then your valves could be shot.
 
D

Dragstr05

New Member
Dec 21, 2004
643
1
0
40
Stafford VA
Mar 20, 2007
#4
  • Mar 20, 2007
  • #4
the98stang said:
Could be the rings as well. How many miles are on the engine? What weight oil are you using? You can do a compression test to see if the rings are bad. If the compression is low, add a cap of oil into the cyclinder. Let it sit for a few minutes. If you test the same cylinder again and the compression goes up, your rings are bad. If the smoke comes out the back on deceleration (dropping RPM) then your valves could be shot.
Click to expand...

If the rings are bad, a compression test may not tell the story. There are several sets of rings, and there are specific rings for just the oil.

IMO Just the simple fact that his primary complaint of visible smoke from the exhaust is after idling and at start up, the valve stem seals should be the primary suspect.
 
C

cooter_11

Member
Apr 22, 2005
138
0
16
GA
Mar 22, 2007
#5
  • Mar 22, 2007
  • #5
I run 10-30 in it. when I bought it from the guy it was supposed to have 30k mile on it.

Do you guys have any tips on replacing the valve seals?

Thanks for the help
 
You must log in or register to reply here.

Similar threads

J
'04 3.8L V6 mineral deposits and oil on #3 cylinder. Does it need a rebuild or something simpler?
  • joeybuddy96
  • Mar 18, 2026
  • SN95 V6 Mustang Tech
Replies
7
Views
290
SN95 V6 Mustang Tech Jul 24, 2026
gkomo
Engine Gas in my oil
  • limp
  • Jun 15, 2025
  • Fox 5.0 Mustang Tech
  • 2
Replies
35
Views
1K
Fox 5.0 Mustang Tech May 16, 2026
Mindseye007
3
Eight inches is enough for me...
  • 351MooseStang
  • Nov 27, 2025
  • 1974 - 1978 Mustang II Talk & Tech
Replies
5
Views
584
1974 - 1978 Mustang II Talk & Tech Mar 2, 2026
Bullitt347
B
'03 GT Fuel Pump/Pressure/Delivery Issue
  • Brodach
  • Oct 21, 2025
  • SN95 4.6L Mustang Tech
Replies
8
Views
917
SN95 4.6L Mustang Tech Oct 31, 2025
gkomo
6
Hey all,I’m putting together a 302 for my 1968 Mustang and wanted to post the combo + some questions to make sure I’m not missing crucial
  • 68_Disgustang
  • Feb 22, 2026
  • 1965 - 1973 Classic Mustangs -General/Talk-
Replies
4
Views
908
1965 - 1973 Classic Mustangs -General/Talk- Jun 20, 2026
gray owl
G
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?