White sludge on oil cap, intake or heads? - MustangForums.com


4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

Reply
 
 
 
Thread Tools Search this Thread
Old 11-15-2012, 11:11 PM   #1
40flier
Thread Starter
 
Join Date: Jul 2012
Location: Michigan
Posts: 8
Default White sludge on oil cap, intake or heads?

99 GT 86k was an estate car. Just getting ready to drive on a two day trip. Changing oil (no milkshake) find the dreaded sludge. Coolant has been going down over a month period. Old wrench friend says if it was a headgasket it'd be overheating so its most certainly an intake gasket.

Agree or disagree?

I'll do the intake myself but pulling the heads could be a project.
40flier is offline   Reply With Quote
Old 11-16-2012, 08:52 AM   #2
cliffyk
TECH SAVANT
 
cliffyk's Avatar
 
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,924
Default

Disagree.

The intake manifold is always under negative pressure (-1 to -10 psi), and the cooling system is always under pressure (10 psi or so) so a leaking manifold passage or gasket will pull coolant into the intake, but not inject anything back into the cooling system.

OTH a bad head gasket, depending of course on where it has failed, can on the compression stroke force air/fuel and a bit of oil back into the cooling system--and on the intake stroke pull coolant into the combustion chamber where is will be burned. With the coolant only "...going down over a month..." this might not even show up in the exhaust.

Failed head gaskets do not always result in overheating, unless it is a BIG fail...
cliffyk is offline   Reply With Quote
Old 11-16-2012, 09:05 AM   #3
BraMas
5th Gear Member
 
BraMas's Avatar
 
Join Date: Jun 2005
Location: Holland, MI
Posts: 4,634
Default

I'm kinda confused by your post. Did you pull the oil cap an there was white sludge on it? If so that is completely normal and is just condensation and oil mixing on the cap. Very normal for a MI car with the weather being so cold and warming up like it has been
BraMas is offline   Reply With Quote
Old 11-16-2012, 09:19 AM   #4
cliffyk
TECH SAVANT
 
cliffyk's Avatar
 
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,924
Default

Yeah,

I misunderstood as well, my brain told me the sludge was in the coolant, however it is not stated where the "dreaded sludge" was observed...
cliffyk is offline   Reply With Quote
Old 11-16-2012, 10:32 AM   #5
40flier
Thread Starter
 
Join Date: Jul 2012
Location: Michigan
Posts: 8
Default

There was a heavy layer under the oil filler cap and also on the oil filler tube going down into the engine. Appears very reminisicent of the dexcool problem GM had on their v6's that
I've encountered.I have added about 32oz of coolant this summer to maintain the fill line. I have only had the car for five months and put 4k gentle miles on it. There was a class action suit which ford addressed on these models by extending the warranty to seven years. My dealer says all of that is gone BTW.

I don't have condensation issues here on my other cars including a vette.

The question seems to be whether this amount coolant loss is normal on the 4.6 and not related to sludge? Believe me, if it ain't broke I don't want to fix it!
40flier is offline   Reply With Quote
Old 11-16-2012, 10:57 AM   #6
40flier
Thread Starter
 
Join Date: Jul 2012
Location: Michigan
Posts: 8
Default

Changed oil, 90 miles on xway, next morning the oil cap looks like this. Well, I can't post attachments but the bottom of the cap is coated with white sludge. Gotta be a gasket or something in the polution system. There isn't a PCV valve in the 4.6 is there?
40flier is offline   Reply With Quote
Old 11-16-2012, 10:57 AM   #7
uberstang1
Chupacabra
 
uberstang1's Avatar
 
Join Date: Jul 2004
Location: wilkes-barre PA
Posts: 9,612
Default

The sludge on the cap is normal
uberstang1 is offline   Reply With Quote
Old 11-16-2012, 11:54 AM   #8
cliffyk
TECH SAVANT
 
cliffyk's Avatar
 
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,924
Default

Not on any properly functioning engine I have ever owned...
cliffyk is offline   Reply With Quote
Old 11-16-2012, 12:00 PM   #9
uberstang1
Chupacabra
 
uberstang1's Avatar
 
Join Date: Jul 2004
Location: wilkes-barre PA
Posts: 9,612
Default

In climate changing states it's common with winter it's condensation and oil mix, every single cap u pull around me right now will have it.
uberstang1 is offline   Reply With Quote
Old 11-16-2012, 12:12 PM   #10
uberstang1
Chupacabra
 
uberstang1's Avatar
 
Join Date: Jul 2004
Location: wilkes-barre PA
Posts: 9,612
Default

As condensation builds up in fall when the temp changes condensation builds up in the cap, short trip driving causes it to build up. A lot of newer cars have a recess in the cap to catch it and keep it away from the valve cover, my f150 has one
uberstang1 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
2015 Mustang Expansion Tank Granatelli Sales The New S550 2015-2016 Mustang 15 06-23-2016 06:26 PM
2002 Mustang GT Premium 5 Speed JonnyBlazeGT Mustangs For Sale 3 11-03-2015 02:10 AM
Switching from 3.89 to 3.00 gears... musnicki Classic Mustang General Discussion 8 09-23-2015 08:11 AM
2013 GT500 GB/BS, 3,700K miles, All options except glass roof, 8yr/36k mile ESP inyadreems Mustangs For Sale 2 08-21-2015 10:10 AM
Need Help Diagnosing Have Codes (Confused) djbigskrilla 2005-2014 Mustangs 13 08-11-2015 01:59 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -5. The time now is 02:20 PM.