For 1990-2009 cars

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

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

Models: | 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).

### Condition

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.

### Cause

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

### Correction

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.

Tighten

1. Tighten the vertical lower intake manifold bolts (1) to 7N·m (62 lb in).
2. Tighten the diagonal lower intake manifold bolts (2) to 7N·m(62 lb in).
3. Tighten the vertical lower intake manifold bolts (1) to 13N·m(115 lb in).
4. Tighten the diagonal lower intake manifold bolts (2) to 25N·m(18 lb ft).

### Parts Information

Part Number | Description | Qty
--- | --- | ---
19169127 | Lower Intake Manifold Gasket Kit (includes 4 long bolts and 4 short bolts) | 1

### Warranty Information

For vehicles repaired under warranty, use:

Labor Operation | Description | Labor Time
--- | --- | ---
J0259 | Manifold or Gasket, Intake (Upper, Lower) - Replace Gasket Lower | Use Published Labor Operation Time