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Super Mechanic
Super Mechanic, Master technician
Category: Chevy
Satisfied Customers: 17219
Experience:  29 yrs. exp., ASE master, cert. in G.M. electrical, a/c, susspension, brakes, electronic steering
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3.4: Gm..litre..that was eating coolant at 60k miles, intake gsk

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Gm's 3.4 litre motor (3400) that is in all the mini vans. I have a 2002 model that was eating coolant at 60k miles, intake gsk replaced and problem solved. 20k miles later and it is doing the same thing.
Why are these so fusy??   intake torque spec??   Sounds like a common problem with the 3400

what is the cure to not doing the intake gsk every 20-30k?

Hello and welcome to Just, Super mechanic here. About your vehicle.


There has been a service bulletin for that type of concern. Here is what it states.



Engine/Cooling System - Oil or Coolant Leaks


Bulletin No.: 03-06-01-010C

Date: April 08, 2008

Engine Oil or Coolant Leak (Install New Lower Intake Manifold Gasket)


2000-2003 Buick Century
2002-2003 Buick Rendezvous
1996 Chevrolet Lumina APV
1997-2003 Chevrolet Venture
1999-2001 Chevrolet Lumina
1999-2003 Chevrolet Malibu, Monte Carlo
2000-2003 Chevrolet Impala
1996-2003 Oldsmobile Silhouette
1999 Oldsmobile Cutlass
1999-2003 Oldsmobile Alero
1996-1999 Pontiac Trans Sport
1999-2003 Pontiac Grand Am, Montana
2000-2003 Pontiac Grand Prix
2001-2003 Pontiac Aztek


with 3.1L or 3.4L V-6 Engine (VINs J, E - RPOs LG8, LA1)


This bulletin is being revised to update the Parts Information and add an Important statement. Please discard Corporate Bulletin Number 03-06-01-010B (Section 06 - Engine).


Some owners may comment on an apparent oil or coolant leak. Additionally the comments may range from spots on the driveway to having to add fluids.


Lower Intake manifold may be leaking allowing coolant oil or both to leak from the engine.


Install a new design lower intake manifold gasket. The material used in the gasket has been changed in order to improve the sealing qualities of the gasket. When replacing the gasket the lower intake manifold bolts must also be replaced and torqued in sequence to a specification.







Important: The gasket kit part number listed below now includes the new bolts (4 long bolts and 4 short bolts) with the pre-applied threadlocker on them. It is no longer necessary to order the bolts separately when ordering gaskets.


Notice: An oil leak may result if the vertical bolts are not tightened before the diagonal bolts.


Diagonal bolts may require a crows foot to tighten.


1.Tighten the vertical lower intake manifold bolts (1) to 7 N.m (62 lb in).


2.Tighten the diagonal lower intake manifold bolts (2) to 7 N.m (62 lb in).


3.Tighten the vertical lower intake manifold bolts (1)to 13 N.m (115 lb in).


4.Tighten the diagonal lower intake manifold bolts (2) to 25 N.m (18 lb ft).




Super Mechanic and other Chevy Specialists are ready to help you
Customer: replied 8 years ago.
thanks for your help Super!!
Customer: replied 8 years ago.
Super, is that a GM part no or delco?
That is the GM part number for the new style gasket. I normally torque them in 2 stages also, in the sequence of course, haven't had a problem that way, thanks
Customer: replied 8 years ago.
ok, thanks again.
Your welcome and come again, anytime, thanks