Question about 1998 Pontiac Bonneville

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When changing the intake manifold i was told not to drain the oil coolant mixture in your engine until you replace the upper or/and lower gaskets and plenium and have everything back together then pull the spark plugs and connect the battery and turn the key in the ignition for 30 seconds to expell the water in the compression chamber. Is this true?

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  • Expert
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Oil is not goin to leak. anti willget down into the oildrain as much as needed to get below watewr jackets

Posted on Oct 27, 2012

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Posted on Jan 02, 2017

samson-1
  • 153 Answers

SOURCE: leaking

The intake manifold gaskets are the ones you need to be concerned with.

Posted on Oct 08, 2008

  • 2 Answers

SOURCE: 2001 Aztec. Replaced intake gaskets, now no spark.

make sure all 3 connectors are connected to ignition module

Posted on Feb 12, 2009

  • 6 Answers

SOURCE: Excessive Oil consumption, 1995 Bonneville Vin K 3.8

The PCV valve gets it's vacuum from the plenum itself. Some 3.8L have different types of connections on the top of the valve (electrical or mechanical), but none have a vacuum line on them.

If you replaced the lower intake gaskets, it is very likely they crushed around the intake bolts. This will cause oil to leak into the intake and pool in the recesses of the lower intake. You are also likely to be leaking anti-freeze.

This is a very common problem with OEM gaskets. After market gaskets made by Fel-Pro have metal rings in them specially to stop this problem. They are available at NAPA and other stores.

Posted on Jun 06, 2009

  • 246 Answers

SOURCE: Coolant level sensor pops out

yes. it sounds like your sensor is held in with a retaining clip which looks to have been lost in the swap over from old to new parts. take the car back to the shop that serviced it and tell them about your issue. hopefully not too much damage was caused by the overheating. i hope this helps and good luck!

Posted on Feb 17, 2010

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dttech
  • 4803 Answers

SOURCE: I am leaking coolant from

First, I am assuming that your vehicle is equipped with the 3.1L V-6 and NOT the 3.8L V-6? (Engine size is really nice to know in situations like this!)

It could be any where in the cooling system. The intake gaskets also like to leak externally. A bad intake gasket does not always mix antifreeze with the oil. Take a flashlight and look for coolant on top and/or down each side of the transmission bell housing. This is VERY common on these engines. It may be leaking just enough to where the exhaust crossover pipe is burning it up (and stinking) before it has a chance to run on the ground. Also look for stains on the intake manifold-to block mating surfaces and on the side of the bell housing that will indicate a leak. if your vehicle is still using Dex-Cool, the stains will be pink. If your coolant has been changed to green antifreeze, the stains will usually be real white or dark green depending on the brand and the severity of the leak.

If there are no leaks or stains in this area, then look around the water pump area for the same things. The radiator or coolant hoses (including heater hoses) could also be leaking. If it is stinking when the engine is hot, then you could get it hot then shut if off and look for steam.

TIP: A bright LED flashlight works really good for locating steam.

Posted on Jun 18, 2011

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2 Answers

Where is the thermostat in my 95 Isuzu rodeo 3.2 ltr. V6


where is such a simple word
where;
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x marks the spot
asked many time here, and same answer.
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pull engine block, ? no
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here-bp54dlzlp0pmj5fwzd335nwr-4-0.jpg

Mar 07, 2017 | Isuzu Rodeo Cars & Trucks

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I've got a 2002 Buick LaSabre. Firewall looks melted..car gets hot on short run. I do have small leak brake fluid. Could that be the problem?.


That would not cause the engine to get overheated. It may be too late to save your engine, but check if you have coolant loss and brown sludge on the oil dipstick, or if under the oil fill cap there is a milky brown substance. This is evidence of coolant getting into the oil. This engine in LeSabres has a common problem of intake manifold gasket failure, leading to loss of coolant that winds up in the cylinders and into the oil. If not driven much or if the engine did not get too hot, the cylinder heads and head gaskets may not have been ruined, but if overheated badly, the engine may be a total loss.

The intake on the engine is two parts: an upper intake manifold that is plastic (and just waiting to fail-many owners have had to replace this) and an aluminum lower intake manifold. The gaskets under the lower manifold are the ones that develop leaks. Because GM used inferior factory gaskets (also made of plastic) as a cost-cutting measure. They took a very good engine, well known for durability, and shaved costs with inferior gasket material-go figure.

Dec 06, 2014 | Cars & Trucks

1 Answer

How to fix oil leaks in chevy ss impala 1996



Instructions

1. Removal

Unscrew the bolt that holds the negative connection to the Impala's battery. Set this bolt aside for later use.

Remove the engine cover to access the intake manifold and manifold gasket. Disconnect the throttle body inlet duct from the engine.

Twist off the radiator cap to allow draining of the coolant to flow more smoothly. Place an empty container beneath the radiator's drain plug, and remove this plug. Allow all of the engine coolant to drain into the empty container. Replace the drain plug once you are finished.

Tag all of the electrical wiring and hoses before removing so that reconnection is precise to factory settings. Remove these parts, individually, from the intake manifold.

Loosen the bolts that hold the intake manifold to the Impala's engine block. Lift the intake manifold from the block once all bolts have been completely removed.

Use the flat-head screwdriver to pry the old intake manifold gasket from the engine block. Discard this part once you have removed it.

Clean the engine block thoroughly with the engine degreaser and linen cloth. If necessary, use a gasket scraper to remove excess buildup and grime.

2. Installation

  • Coat the top and bottom of the new intake manifold gasket with a chemical sealer so that it bonds to the engine block securely. Position this new manifold gasket so that it lines up perfectly with the cylinder ports of the Impala's engine block.

Place the old intake manifold on top of the newly-installed manifold gasket until it aligns with all of the holes of the cylinder flanges and manifold gasket.

Attach all of the bolts with your hand to the manifold. Once all bolts have been positioned, use a torque wrench and apply 15 foot-pounds of pressure to the bolts to secure the manifold into place.

Reconnect all of the necessary hoses and electrical wiring to the intake. Pour the engine coolant back into the radiator.

Reattach the engine cover on top of the intake manifold and engine block. Start the Impala's engine and check for any leaks around the new intake manifold gasket.

Jul 08, 2012 | 1996 Chevrolet Impala SS

1 Answer

Losing antifreeze changed thermostat and resivoir cap


Check you oil for signs of coolant contamination. If coolant is present in the oil, you may have a leaking head gasket or intake manifold gasket. If there is no sign of coolant in the oil, the antifreeze could be leaking past the intake gaskets and into the combustion chamber. It could also be a leak that only shows up when the engine is running, and you are losing the coolant as you drive. This kind of leak is very difficult to locate. You will have to look for signs of antifreeze around the upper and lower intake gasket area with a strong flashlight. Also check for signs of leakage at the upper and lower radiator hose connections and the drain valve at the bottom of the radiator. If you smell antifreeze inside the car, check the carpet for dampness caused by a heater core leak. Sounds like a lot of work, but these mystery leaks as I like to call them, can take repeated inspections before you finally locate them. I hope I have been of some help. Good luck and let me know what you find.

Feb 22, 2011 | 2002 Oldsmobile Intrigue

2 Answers

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.

Aug 05, 2010 | 1997 Pontiac Grand Prix

4 Answers

My 97 oldsmobile cutlass supreme is leaking coolant and over heating, why? I also noticed tht the oil is milky. Please help


The most likely source of your problem is NOT a head gasket or cracked head, but the black plastic plenum or "upper intake manifold". These GM engines tend to melt, crack, or warp the plenum because of the hot EGR tube sticking up through the plastic.

If water is getting into your oil (milky looking), your lower intake manifold gasket is probably cracked. Once the plenum is off the engine, there are only about a dozen bolts holding the lower intake manifold on. When you replace the gasket, it is recommended to use an ALL METAL gasket with rubber seals to prevent this from happening again. The metal gaskets cost about $80 where as the plastic ones that are prone to breaking cost about $45. Better to fix it right once than to do it wrong several times.

Also, if you are still using Dexcool coolant (orangeish), be sure to change it every two years or so as it does bad things to seals when it gets old.

Nov 13, 2009 | 1997 Oldsmobile Cutlass Supreme

1 Answer

Instrution for lower intake repair 3.4 camaro


remove all accessories from front of engine -alt and ps pump,then drain cooling system ,remove upper intake- remove valve covers then lower intake.Then take out push rods to remove gasket(keep push rods in order as exhaust rods ar longer-will bend valves if installed wrong-get a piece or card board and punch in 12 holes 6and 6opposite each other,then put push rods in it)please not their is an updated gasket set from FEL PRO that has all you need to repair the problem with updates torque specs for lower manifold in the box REMEMBER change motor oil befor starting-you can even pour a little oil onto lifters before putting lower back this is to get any coolant from upper block to run into pan before oil change,if not knocking will occur in the next week

Oct 04, 2009 | 1995 Chevrolet Camaro

1 Answer

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.

Sep 11, 2009 | 1999 Buick Regal

3 Answers

1999 Pontiac Grand Am with "lower intake leak"...What does this mean specifically? Would this mean the intake for the radiator, gasket, or valve?


Usually intake has to do with the induction system, as in intake manifold , The intake manifold can have several types of leaks, the intake can have a vacuum leak, oil leak, coolant leak or a combination of any of the before mentioned....hope this helps,

Aug 30, 2009 | 1999 Pontiac Grand Am GT

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