Serie I Intake leaks - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 11-07-2003, 07:46 PM   #1
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Nov 2003
Location: Blue Springs, MO
Posts: 66
Thanks: 0
Thanked 0 Times in 0 Posts
stevej94 is on a distinguished road
Default Serie I Intake leaks

I have a 94 SE with the series 1 3800 and the plastic upper intake manifold. After reading all the posts about cracking, I thought I check mine. I noticed a small pool of coolant on the lower intake next to one of the fuel injectors. Am I toast? I thought Series 1 did not have this problem or is it a leaking gasket? I don't seem to be consuming coolant. It has 125k on it.
stevej94 is offline   Reply With Quote
Old 11-07-2003, 08:14 PM   #2
Senior Member
True Car Nut
 
Join Date: May 2002
Location: Edmonton, AB Canada
Posts: 2,621
Thanks: 0
Thanked 0 Times in 0 Posts
DeathRat is on a distinguished road
Default Re: Serie I Intake leaks

Quote:
Originally Posted by stevej94
I have a 94 SE with the series 1 3800 and the plastic upper intake manifold. After reading all the posts about cracking, I thought I check mine. I noticed a small pool of coolant on the lower intake next to one of the fuel injectors. Am I toast? I thought Series 1 did not have this problem or is it a leaking gasket? I don't seem to be consuming coolant. It has 125k on it.
Here'* your fix......

3.8L (L) Engine Intake Reseal Series I PH93/94:
17113265 Upper Intake Gasket Kit
12338840 Lower Intake Gasket Kit
24501671 EGR Valve Gasket
88891743 Coolant By-Pass Fitting
10953472 RTV Sealant
993088 Antifreeze {2L}
992878 Engine Shampoo
88901247 Brake Kleen


It'* just a lower intake leak probably.....
DeathRat is offline   Reply With Quote
Old 11-07-2003, 08:16 PM   #3
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

I agree. Probably just a leaky upper intake seal. Easy fix. When you open it up to fix it, you'll probably notice one or two ultra-clean runners in your lower intake manifold. Typical sign of leaking coolant, even small amounts.
willwren is offline   Reply With Quote
Old 11-07-2003, 10:27 PM   #4
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Nov 2003
Location: Blue Springs, MO
Posts: 66
Thanks: 0
Thanked 0 Times in 0 Posts
stevej94 is on a distinguished road
Default Thanks!

Thought the seals could be a possibility. Is this as critical as a cracked manifold? Am wondering if I can put it off a while until I do some valve work (leaking valve seals). That brings me to another question- is it possible to replace valve stem seals without pulling the heads? I heard there a trick pressurizing the combustion chambers with compressed air to keep the valves from falling down while you have the springs off....
You guys are great.
stevej94 is offline   Reply With Quote
Old 11-08-2003, 09:25 AM   #5
Junior Member
 
Join Date: Nov 2003
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Ann Segal is on a distinguished road
Default

Hi! I wish I had known about the intake manifold problems and checked for them like you are doing.That'* smart. I have a 1999/ 92K with total engine failure as of Tuesday and am getting a brand new engine. I am just now finding out about the problems with the Series 3800 engines and the intake manifolds, antifreeze in the engine, etc. What an expensive auto repair lesson.
Ann Segal is offline   Reply With Quote
Old 11-08-2003, 10:10 AM   #6
Senior Member
True Car Nut
 
Join Date: May 2002
Location: Edmonton, AB Canada
Posts: 2,621
Thanks: 0
Thanked 0 Times in 0 Posts
DeathRat is on a distinguished road
Default Re: Thanks!

Quote:
Originally Posted by stevej94
Thought the seals could be a possibility. Is this as critical as a cracked manifold? Am wondering if I can put it off a while until I do some valve work (leaking valve seals). That brings me to another question- is it possible to replace valve stem seals without pulling the heads? I heard there a trick pressurizing the combustion chambers with compressed air to keep the valves from falling down while you have the springs off....
You guys are great.
Dougtful your manifold is actually "cracked". As to putting it off, here'* a little bit of advice on what happens if you do......

Be prepared to get a new engine rebuilt due to coolant contamination to the crank main bearings & conn rod bearings, along with new crankshaft. Estimated cost for the 7 others I've personally quoted on in the last 6 months are about: $500 Can for Crank Kit and 16-20 Hours labour.

As about the Stem seals, well you can an adapter that screws into the spark plug hole for an air line that will keep air pressure on the bottom of the valve.
DeathRat is offline   Reply With Quote
Old 11-08-2003, 11:06 AM   #7
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Nov 2003
Location: Blue Springs, MO
Posts: 66
Thanks: 0
Thanked 0 Times in 0 Posts
stevej94 is on a distinguished road
Default Upper Intake

Since I appear to have a leaking manifold gasked, is it possible to leak oil into the intake manifold? If so, is this why I'm getting a little bit of smoke?
OK, I won't put it off!
stevej94 is offline   Reply With Quote
Old 11-08-2003, 01:36 PM   #8
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Deathrat'* warning would be applicable if your coolant was mixing with the oil. After driving, how does the oil look on the dipstick? Normal? Milky brown? If normal, you're just burning it off. That would explain the smoke you're seeing. This scenario would mean your manifold vacuum while running is sucking it into the cylinders and burning it off.

Best case scenario, you'll be replacing the TB seal and intake seal, plugs and probably O2 sensor.

Worst case, what he said
willwren is offline   Reply With Quote
Old 11-08-2003, 02:25 PM   #9
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Nov 2003
Location: Blue Springs, MO
Posts: 66
Thanks: 0
Thanked 0 Times in 0 Posts
stevej94 is on a distinguished road
Default Upper intake

Oil looks fine. It still has some transparency even after a 1000 miles on it. I've had a car blow a head gasket before and I know what coolant in the oil does. How does oil get into the intake in this case, though? Are there oil passages that pass through the manifold? Why would an intake manifold carry oil?
stevej94 is offline   Reply With Quote
Old 11-08-2003, 06:02 PM   #10
Senior Member
True Car Nut
 
Join Date: May 2002
Location: Edmonton, AB Canada
Posts: 2,621
Thanks: 0
Thanked 0 Times in 0 Posts
DeathRat is on a distinguished road
Default Re: Upper intake

Quote:
Originally Posted by stevej94
Oil looks fine. It still has some transparency even after a 1000 miles on it. I've had a car blow a head gasket before and I know what coolant in the oil does. How does oil get into the intake in this case, though? Are there oil passages that pass through the manifold? Why would an intake manifold carry oil?
It doesn't! It just seals off the upper block from the heads itself. It the lower intake seals are leaking oil, it'* 90% chance they will leak EXTERNALLY. The other 10% chance it will leak into the combustion chamber entrance into the head itself. The oil comes from the Hydrallic Lifter galleries BTW & used to lubricate them externally as well as the ballance shaft.

*EDIT: Spelling*
DeathRat is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
WTB : 3800 Serie 1 Performance Part's ! Moparfans Performance, Brainstorming & Tuning 4 05-10-2008 08:35 PM
Serie 2 piston oversizing ...benefit?? mike_peperni Performance, Brainstorming & Tuning 9 03-05-2006 09:46 AM
GM addresses (some) L36 intake manifold leaks (56k warning) enmityst General GM Chat 5 04-09-2004 10:57 PM
Sunroof leaks. G2SSEi95 1992-1999 7 09-10-2003 01:35 AM
...TRUNK leaks >>> UPDATE! BusMaster007 1992-1999 8 01-21-2003 10:52 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



All times are GMT -4. The time now is 06:17 AM.


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.