2007 Cadillac CTS 3.6L Logo
Posted on Apr 20, 2009
Answered by a Fixya Expert

Trustworthy Expert Solutions

At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.

View Our Top Experts

2002 Grand Prix GTP Supercharged

The lower intake manifold is leaking. People at work indicated that the problem with the GM lower intake manifolds is that the manifold warps causing the gasket to leak, not so much a gasket problem. They recommend replacing the lower intake manifold & gaskets. A local repair garage has a complete kit which includes the intake manifold. I am also told that GM will reimburse some of the expense as this is a common GM problem. Does anyone have suggestions?

Answer This Question

1 Answer

Mike LaPres

Mike LaPres

Level 3:

An expert who has achieved level 3 by getting 1000 points
All-Star:

An expert that got 10 achievements.
MVP:

An expert that got 5 achievements.
Vice President:

An expert whose answer got voted for 100 times.

  • Cadillac Master 757 Answers
  • Posted on Jun 19, 2009
Mike LaPres
Cadillac Master
Level 3:

An expert who has achieved level 3 by getting 1000 points
All-Star:

An expert that got 10 achievements.
MVP:

An expert that got 5 achievements.
Vice President:

An expert whose answer got voted for 100 times.

Joined: Mar 30, 2009
Answers
757
Questions
0
Helped
278439
Points
2002

I believe there is a recall for that problem, covered 100%

5 Related Answers

Anonymous

  • 366 Answers
  • Posted on Feb 23, 2009

SOURCE: gm dex-cool vs prestone anti-freeze...

yes,your guy is right,a lot of gm cars have the int. gasket problem because of dex.

Ad

Anonymous

  • 21 Answers
  • Posted on Apr 20, 2009

SOURCE: Replacing 90 pipe assembly part on 1997 Grand Prix GT

If its the same as my GTP, its just under the Supercharger right in the middle of the intake.
Just pull it out, its only held in with a O-ring. When you replace it, make sure you lube the gasket with grease so its easier to put back in, and less likely to nick the O-ring.

Anonymous

  • 176 Answers
  • Posted on Jun 30, 2009

SOURCE: Where is the egr valve on a 1999 pontiac grand

upper left side of engine, near throttle body

.

  1. Disconnect the electrical connector from the EGR valve.
  2. Remove the EGR valve retaining nuts
  3. Remove the EGR valve
  4. Remove the gasket from the EGR valve adapter .
INSTALLATION PROCEDURE
  1. Install a new gasket on the EGR adapter . NOTE: Refer to Fastener Notice in Cautions and Notices.
  2. Install the EGR valve and the retaining nuts . Tighten Tighten the nuts to 30 N.m (22 lb ft) .
  3. Connect the EGR valve electrical connector.


Anonymous

  • 95 Answers
  • Posted on Sep 22, 2009

SOURCE: blown upper air intake manifold on gm 3800 series

Parts stores carry a kit including a manifold and gaskets. When I do the job I always replace the lower intake gaskets because they leak too. Make sure the lower manifold is not warped around the rubber gaskets towards the throttle body side, a new or used loewr manifold might be needed to ensure a correct repair.

Mike

  • 4383 Answers
  • Posted on Sep 11, 2010

SOURCE: '06 chevy aveo vacuum leak at the intake manifold.

Proper resealing and problem resolution (warpage, etc.) cannot be done without removing and inspecting...
TPI sensors are problems on many cars, not a huge deal....

Ad

Add Your Answer

×

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

0helpful
1answer

What is the torque specs on a 2004 pontiac grand prix GTP Comp G for the lower intake manifold?
Here is the order and specs
tork-rqrs4pndmg523gtr1km4rfhx-5-0.jpg
Read full answer
Sep 25, 2017 • Pontiac Cars & Trucks
0helpful
1answer

What are the intake manifold torque specs on a 2005 Pontiac grand Prix gtp 3.4 liter with super charger?
If it were mine, I'd want to be very sure what it was and so I always use a Repair Manual I can see and read, but that me.
Read full answer
Mar 13, 2015 • 2005 Pontiac Grand Prix GTP
1helpful
1answer

Transmission Compatibility
As you see I provided you the models you can apply the transmission :The 4T65E-HD (code MN7) is a heavy duty version of the 4T65-E used with more powerful engines such as the LS4 V8 and L67/L32 supercharged V6. Applications: 2.93:1 MN7 Pontiac Bonneville SSEi L67 Chevrolet Impala L67 Chevrolet Monte Carlo L67 Pontiac Grand Prix GTP/GXP Buick Regal GS Buick Riviera L67 (97-99) So ,yes you can!
Read full answer
May 28, 2013 • 1998 Pontiac Grand Prix
0helpful
1answer

My 1999 Grand Prix GTP won't start after changing
Double check the wiring harness to make sure it did not get pinched under the manifold or the top cover. It is common for a single wire to get pinched and shorted and cause this.
Read full answer
Oct 31, 2012 • Cars & Trucks
0helpful
1answer

1999 Grand Prix GTP Supercharged 3.8L gas engine. Poor fuel economy.
did you check the lower intake manifold gaskets? they go bad on the 3800 series 2, since you have the supercharger you won't have an issue with the upper intake because it is not plastic but the gaskets may be bad as well. that engine runs best with irridium plugs.
Read full answer
Sep 23, 2012 • 1999 Pontiac Grand Prix
0helpful
1answer

2002 Pontiac Grand Prix GT (non supercharged) is making a horrible squeeling noise coming from where the serpentine belt is. The belt has been replaced along with the tensioner pulley and brakes. I...
These vehicles are known to have power steering issues. They use up fluid and at about a 100k or so the pulley itself can "sheer" right off. I would check your power steering fluid level and go from there.
Thank you,
Lee
Read full answer
Feb 07, 2011 • 2002 Pontiac Grand Prix
9helpful
2answers

Need to replace the intake manifold
3.8L Engine (most common) Upper Intake Manifold To Remove:
  1. Drain the cooling system.
  2. Remove or disconnect the following:
    • Negative battery cable.
    • Fuel injector sight shield.
    • Air cleaner intake duct.
    • Right spark plug wires from the ignition control module and reposition.
  3. Relieve the fuel pressure.
  4. Remove or disconnect the following:
    • Fuel rail assembly.
    • Brake booster hose from the vacuum source manifold in the upper intake manifold.
    • Exhaust Gas Recirculation Valve (EGR) wiring harness heat shield nut, bolt and the EGR heat shield.
    • Throttle body support bracket upper bolt.
  5. Disconnect the electrical connectors from the following:
    • EVAP purge solenoid
    • Throttle Position (T/P) sensor
    • Idle Air Control (IAC) valve
    • Manifold Absolute Pressure (MAP) sensor
    • Mass Air Flow (MAF) sensor
    • EVAP purge solenoid vacuum line from the throttle body.
    • Accelerator and the cruise control cables with the bracket from the throttle body.
  6. Remove or disconnect the following:
    • Upper intake manifold bolts and stud.
    • Clean the upper intake manifold bolt threads.
  7. Remove or disconnect the following:
    • Upper intake manifold by lifting the back of the intake and sliding the manifold forward from the throttle body support bracket.
    • Upper-to-lower intake manifold carrier gasket from the upper intake manifold.
  8. If the upper intake manifold is being replaced, remove the following:
    • Throttle body assembly.
    • Manifold Absolute Pressure (MAP) sensor.
    • Positive Crankcase Ventilation (PCV) valve.
    • Vacuum source manifold.
Upper intake manifold bolt torque sequence (3.8L engine) gm-03-38-530.gif

To Install:
  1. If the manifold was replaced, install or connect the following:
    • Vacuum source manifold.
    • Positive Crankcase Ventilation (PCV) valve.
    • Manifold Absolute Pressure (MAP) sensor.
    • Throttle body assembly.
    • Upper-to-lower intake manifold carrier gasket to the upper intake manifold.
  2. Carefully place the upper intake manifold onto the lower intake manifold. Ensure that the alignment pins in the upper intake manifold align with the holes in the lower intake manifold. NOTE: Apply thread lock compound, to the bolt threads before assembly.
  3. Install or connect the following:
    • Upper intake manifold. Tighten the upper intake manifold bolts in sequence to 89 in lbs (10 Nm)
    • Accelerator and the cruise control cables with the bracket to the throttle body.
    • EVAP purge solenoid vacuum line to the throttle body.
  4. Connect the electrical connectors to the following:
    • Mass Air Flow (MAF) sensor
    • Manifold Absolute Pressure (MAP) sensor
    • Idle Air Control (IAC) valve
    • Throttle Position (T/P) sensor
    • EVAP purge solenoid
  5. Install or connect the following:
    • Throttle body upper support bracket bolt. Tighten the bolt to 89 in lbs (10 Nm)
    • EGR valve wiring harness heat shield, nut and the bolt. Tighten the nut and the bolt to 89 in lbs (10 Nm)
    • Brake booster hose to the vacuum source manifold.
    • Fuel rail assembly.
    • Right spark plug wires.
    • Air cleaner intake duct.
    • Fuel injector sight shield.
  6. Connect the negative battery cable.
  7. Fill the cooling system.
  8. Inspect for fluid or vacuum leaks.
Lower Intake Manifold (W/O Supercharger) To Remove:
  1. Remove or disconnect the following:
    • Upper intake manifold.
    • Generator brace.
    • Drive belt tensioner with the mounting bracket and the heater water bypass inlet pipe.
    • Exhaust gas recirculation EGR outlet pipe bolt from the lower intake manifold.
    • Radiator inlet hose from the water outlet housing.
    • ECT sensor electrical connector.
    • Right upper engine mount strut bracket.
    • Generator brace bracket bolts.
    • Generator brace bracket.
    • Lower intake manifold bolts.
    • Lower intake manifold.
    • Lower intake manifold seals.
    • Lower intake manifold gaskets.
  2. If replacing the lower intake manifold, Remove or disconnect:
    • Water outlet housing bolt and stud
    • Water outlet housing
    • Gasket and the thermostat.
    • ECT sensor.
  3. Inspect the flatness of inlet flanges.
  4. Clean the intake manifold mating surfaces.
  5. Clean the intake manifold bolts and bolt holes of adhesive compound.
To Install:
  1. If removed, install the ECT sensor.
    • Tighten the ECT sensor to 18 ft. lbs. (25 Nm)
  2. If removed, install the thermostat, the gasket, and the water outlet housing.
  3. If removed, install the water outlet housing bolt and the stud.
    • Tighten the bolt and stud to 20 ft. lbs. (27 Nm)
  4. Install or connect the following:
    • Lower intake manifold gaskets. NOTE: Apply sealer GM P/N 12346286 (Canadian P/N 10953472) or equivalent to the ends of the intake manifold seals.
    • Lower intake manifold seals.
    • Lower intake manifold.
    • Lower intake manifold bolts.
    NOTE: Apply thread lock compound GM P/N 12345382 (Canadian P/N 10953489) or equivalent to the two hidden bolts and ensure they are installed.
  5. Tighten the lower intake manifold bolts in sequence to 11 ft. lbs. (15 Nm) gmpc_v6_5.gif

  6. Install or connect the following:
    • Generator brace bracket.
    • Generator brace bracket bolts. Tighten the bolts to 37 ft. lbs. (50 Nm)
    • Right upper engine mount strut bracket.
    • ECT sensor electrical connector.
    • Radiator inlet hose to the water outlet housing.
    • EGR outlet pipe to the lower intake manifold.
    • EGR outlet pipe bolt to the lower intake manifold. Tighten the bolt to 21 ft. lbs. (29 Nm)
    • Drive belt tensioner.
    • Generator brace.
    • Upper intake manifold.
  7. Inspect for leaks.
Lower Intake Manifold (W/ Supercharger) To Remove:
  1. Disconnect the negative battery cable.
  2. Drain the cooling system.
  3. Remove the supercharger.
  4. Remove the thermostat housing.
  5. Remove the EGR pipe at the intake manifold.
  6. Disconnect the electrical connection at the temperature sensor.
  7. Remove the intake manifold and gaskets.
NOTE: The coolant bypass tube will release from the intake manifold when the manifold is removed.
To Install:
  1. Clean the gasket sealing surfaces.
  2. Install the intake manifold gaskets.
  3. Align the coolant bypass tube with the opening in the intake manifold and install the manifold. Tighten the bolts to 11 lb ft (15 Nm).
  4. Install the electrical connector to the temperature sensor.
  5. Install the EGR pipe to the intake manifold.
  6. Install the thermostat housing.
  7. Install the supercharger.
  8. Fill the cooling system.
  9. Connect the negative battery cable.
Read full answer
Aug 05, 2010 • 1997 Pontiac Grand Prix
3helpful
2answers

Intake manifold gasket / replace
3.8L Engine

NOTE The 3.8L (VIN K) non-supercharged engine uses a two-piece intake manifold consisting of an upper air plenum which mounts the throttle body and a lower intake manifold assembly which houses the fuel injectors. The 3.8L (VIN 1) supercharged engine uses a similar lower intake manifold. The supercharger serves as the upper manifold.
Lower Manifold

NOTE Two bolts which fasten the lower intake manifold to the cylinder head are accessible only after the upper intake manifold is removed. These bolts are located in the right front and left rear corners of the lower intake manifold. Remove the upper intake manifold to service the lower intake.
The 3.8L (VIN 1) supercharged engine uses a manifold similar to the 3.8L (VIN K), but the supercharger serves as the upper manifold.
  1. Disconnect the negative battery cable.
  2. On 3.8L (VIN 1) engines, remove the supercharger assembly. Please see the procedure in this section.
  3. Remove the upper intake manifold using the procedure above.
  4. Remove the EGR outlet pipe from the intake manifold.
  5. Detach the engine coolant temperature sensor wiring harness from the sensor.
  6. Remove the lower intake manifold bolts and carefully lift off the manifold.

To install:


0900c15280269f1b.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. Lower intake manifold bolt torque sequence-3.8L (VIN K) engine
  1. Clean all parts well with degreaser, especially the gasket seal surfaces on the upper and lower manifold pieces and between the lower manifold and the cylinder heads..
  2. Install new gaskets to the cylinder heads and new seals to the engine block. Carefully lower the manifold into place. Apply thread-locking compound to the bolt threads. Make sure to install the two hidden bolts in the lower intake manifold. Hand start all bolts, then torque evenly to 11 ft. lbs. (15 Nm). Follow the toque sequence, starting in the center, then working outwards in a circle.
  3. Install the remaining components in the reverse order of the removal process.

Upper Intake Manifold (Plenum)
  1. Disconnect the negative battery cable.
  2. On 3.8L (VIN 1) engines, remove the supercharger assembly. Please see the procedure in this section.
  3. Tag for identification, then remove the right side spark plug wires.
  4. Disconnect the ignition wires from the fuel rail.
  5. Remove the fuel rail. Please see Section 5.
  6. Remove the cable bracket from the intake manifold.
  7. Remove the throttle body.


NOTE Two bolts which fasten the lower intake manifold to the cylinder head are accessible are accessible only after the upper intake manifold is removed. These bolts are located in the right front and left rear corners of the lower intake manifold.
  1. Remove the upper intake manifold bolts and carefully lift the upper intake manifold from the engine.



0900c15280269f1c.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. Upper intake manifold and bolt torque sequence-3.8L (VIN K) engine
To install:
  1. Clean all parts well with degreaser, especially the gasket seal surfaces on the upper and lower manifold pieces.
  2. Install new gaskets to the cylinder heads and new seals to the engine block. Carefully lower the manifold into place. Make sure to install the two hidden bolts in the lower intake manifold. Hand start all bolts, then torque evenly to 89 inch lbs. (10 Nm). Follow the torque sequence, starting in the center, then working outwards in a circle.
  3. Install the remaining components in the reverse order of the removal process.
Read full answer
Sep 11, 2009 • 1999 Buick Regal
4helpful
1answer

2002 Pontac Grand Prix GTP P0171 code engine stumbling at times
Bank 1 is the frt side exhaust manifold (did they say bank 1 sensor 1?),you can start by replacing that sensor,i would check the intake for leaks ,the gm 6cly. are known for bad intake gaskets,you will see oil coming out form the frt or rear of the intake,also check your atifreeze overflow bottle for bronwish sludge,which means that the oil is mixing with the antifreeze.A leaking intake could cause that lean condition.
Read full answer
Mar 29, 2009 • 1998 Pontiac Grand Prix
0helpful
1answer

Replacing 90 pipe assembly part on 1997 Grand Prix GT
If its the same as my GTP, its just under the Supercharger right in the middle of the intake.
Just pull it out, its only held in with a O-ring. When you replace it, make sure you lube the gasket with grease so its easier to put back in, and less likely to nick the O-ring.
Read full answer
Mar 08, 2009 • 1997 Pontiac Grand Prix
Not finding what you are looking for?

View Most Popular

2007 CTS 3.6L

  • Cars & Trucks

Related Question

What is the torque specs on a 2004 pontiac grand prix GTP Comp G for the lower intake manifold?

  • Pontiac Cars & Trucks

Related Topics

778 views

Ask a Question

Usually answered in minutes!

Popular Questions

How to reset an anti theft system on a Cadillac cts

2005 Cadillac CTS

Where is bank 2 sensor one on a Cadillac CTS?

2003 Cadillac CTS

Need to add transmission fluid in Cadillac CTS

2006 Cadillac CTS

ECM replacement for an '05 Cadillac CTS 3.6L

2007 Cadillac CTS 3.6L

Cadillac CTS will not start Starting Disabled - Remove Key mess

2003 Cadillac CTS

Check Out the Latest Top Trucks Report!
Check Out the Latest Top Trucks Report!

View all Fixya Reports

Top Cadillac Experts

ZJ Limited
ZJ Limited

Level 3 Expert

17989 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

15088 Answers

Sean Wright
Sean Wright

Level 3 Expert

2045 Answers

Are you a Cadillac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

PDF Manual
. 2007 CTS 3.6L Manual

2007 CTS 3.6L

Loading...