Intake Manifold is leaking Oil sholud I fix it or let the engine blow - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


General GM Chat When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made. Chat about all things GM (and related cars). Off-topic stuff should be in the Lounge, and all Model specific mechanical problems should be posted in the proper forum.

Reply
 
 
 
Thread Tools Search this Thread
Old 02-13-2011, 10:08 PM   #11
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Feb 2011
Location: Independence, Mo
Posts: 430
Thanked 2 Times in 2 Posts
DeathDealer is on a distinguished road
Default

So it will leak oil and coolant. Is that normal for them to leak both.
DeathDealer is offline   Reply With Quote
Old 02-13-2011, 10:43 PM   #12
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

There is no oil that goes up to the UIM, the only oil that can get up there is threw the PCV valve. The coolant my be mixing with grim or carbon to look like oil.
Danthurs is offline   Reply With Quote
Old 02-13-2011, 11:09 PM   #13
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Feb 2011
Location: Independence, Mo
Posts: 430
Thanked 2 Times in 2 Posts
DeathDealer is on a distinguished road
Default

Well it smells like oil and has the oil texture to it. Also I cleaned the motor off a few times since I noticed the leak.
DeathDealer is offline   Reply With Quote
Old 02-13-2011, 11:11 PM   #14
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

The only places oil can leak high on the engine is perhaps a bit under the lower intake manifold along the lifter valley. And from the valve cover gaskets.
Danthurs is offline   Reply With Quote
Old 02-13-2011, 11:19 PM   #15
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Feb 2011
Location: Independence, Mo
Posts: 430
Thanked 2 Times in 2 Posts
DeathDealer is on a distinguished road
Default

So if it is leaking from the LIM can it be seen. The oil can be seen right under the Mas Airflow Sensor.
DeathDealer is offline   Reply With Quote
Old 02-13-2011, 11:24 PM   #16
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

If it'* right under the throttle body, below the aluminum LIM and the block, then that is the rubber seal. This seal is changed at the same time as the LIM gaskets.
Danthurs is offline   Reply With Quote
Old 02-14-2011, 09:46 AM   #17
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

Oil can leak onto the LIM. Typically in the recessed areas where the bolts are located. This is because the bolts are threaded into the heads wehre coolant and oil ports are located. Oil is less common as it'* not under pressure, but it can seep up there. Did on my car

The best piece of advice we can give you is to replace the UIM when you do this job. The UIM has a weakness in the area where the coolant goes past the EGR tube and into the throttle body. Over many heat cycles the expansion and contraction of the EGR area cracks the one layer of plastic (the manifold is a nylon aka plastic) that seperates the coolant from teh EGR. Then the coolant is in the intake manifold. Down the road this leaks to hydrolocking. Rockauto has about the best price after forum discount code.
BillBoost37 is offline   Reply With Quote
Old 02-14-2011, 11:15 AM   #18
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Feb 2011
Location: Independence, Mo
Posts: 430
Thanked 2 Times in 2 Posts
DeathDealer is on a distinguished road
Default

Thanks yall for the info. I will keep an eye on it and replace it wen it starts to leak more. Right now it is only a small leak not a big leak yet.
DeathDealer is offline   Reply With Quote
Old 02-14-2011, 11:43 AM   #19
Senior Member
Posts like a Northstar
 
Nobotada84's Avatar
 
Join Date: Apr 2009
Location: Indianapolis, Indiana
Posts: 699
Thanks: 0
Thanked 0 Times in 0 Posts
Nobotada84 is on a distinguished road
Default

Hey Joshua looks like you're faced with what i like to think of as a 3800 enthusiast initiation. This is the one job everyone fears at first but once they do are amazed at how easy it is. heres a link that was extremely helpful to me.


https://www.gmforum.com/t278911/


study the write up, until you got the procedure down, don't let the thought of pullin your engine apart freak you out. Thing is once you have it apart you'll get a good idea of just how simple of an engine the 3800 is. have fun and please continue to post any questions you might have.
Nobotada84 is offline   Reply With Quote
Old 02-14-2011, 12:28 PM   #20
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Feb 2011
Location: Independence, Mo
Posts: 430
Thanked 2 Times in 2 Posts
DeathDealer is on a distinguished road
Default

Thanks.
DeathDealer is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Let it Snow, Let it Snow, Let it Snow GXP Venom Lounge 9 10-22-2008 11:55 AM
Previous leaking/blow intake - question about upstream o2 famouslee99gt General GM Chat 2 03-14-2008 03:02 PM
let it snow let it snow let it snow!!!!!!!!!!!!!!!!!!!!!!!!! 88bonnsse Lounge 8 12-05-2007 09:51 PM
Let it snow, let it snow, let it snow.. BonneAlien Your Ride: GM Pictures & Videos 37 12-10-2005 01:02 AM


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



All times are GMT -4. The time now is 12:13 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.