Question about 1999 Chevrolet Tahoe

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Easy most likely intake manifold gasket very commom

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Yeah

Posted on Sep 08, 2009

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Battery died and replaced but now hard shifting, high idle and will suddenly quit running. Could this be the ECM?


Sounds like the air intake manifold gasket getting bad. Easy way to test this is when it is idling high, take a can of brake cleaner and spray it on the air intake, all around the gasket. If the gasket is bad, the car will change it's idle as the cleaner is sprayed on it. This happened to both of my 02 saturns. The air intake manifold gasket is located on the back side on the top of the motor. Very easy to get at and a very easy test. To locate it , look for the throttle cable on the throttle body. Look to the left of that and you will see the air intake. It's an aluminum manifold held on by 8 ten mm nuts. Right behind the fuel injectors. You can also use ether or quick start, and it wont take much. If the idle changes, you intake gasket is bad. Let me know how you make out

Apr 21, 2015 | 2002 Saturn Sl

1 Answer

White smoke in exhaust 1999 lincoln after replacing intake manifold


Sounds like antifreeze leaking in to me. Ports at rear of intake are trick and easy to get that gasket mis-aligned. Hate to say it but when you take the intake back off I imagine the culprit will be obvious. Only other thing is that the intake wsa fine and you actually had a blown head gasket.

Apr 17, 2013 | 1999 Lincoln Town Car

1 Answer

1995 3.8L BUICK REGAL ENGINE REVS HIGH 3000RPMS IN PARK OR GEAR


Good guess if it's not vacuum, it may be the intake manifold gasket allowing too much air into system. Easy teats to check is to spray some engine cleaner, or brake cleaner [ WD40 works too ] directly where the intake manifold bolts on. Making sure you are spraying the gasket. If gasket is bad, you will hear the idle go down or up. Any change at all tells the tale. . Be sure not to spray the exhaust manifold, just the intake manifold. This is the best test to perform Saves time and money. Let me know how you make out. PS Also spray vacuum hoses with the cleaner. Listen to motor at the same time
let me know how you do

Jan 12, 2013 | Buick Regal Cars & Trucks

1 Answer

Change starter in 2001 cad devile


The starter on that engine is mounted between the cylinder heads under the intake manifold. You will need a set of injector O-rings and an intake manifold gasket set to do the job. It is not really hard to do, but a bunch of stuff has to come loose to get the manifold off.
HINT: The gasket surfaces for the intake manifold are very easy to clean up in preparation of re-installing the manifold if you use some rags and carburetor cleaner.

Nov 28, 2011 | 1999 Cadillac DeVille

1 Answer

My 2006 pontiacgrand prix is leaking coolant right above the water pump. There is an L shaped pipe that seems to be where the leak is coming from. Does anyone know what this piece is and how hard it is to...


This was a common issue with these engines. Unfortunately there is no easy way to fix this problem other than to remove the intake manifold and replace this plastic tube along with the intake manifold gasket itself, these engines were common for the intake manifold gaskets leaking and also for that tube to crack over time and start to leak as well.

Like i stated, unfortunately there is no real "easy" fix for your problem. I have replaced many of these tubes and many intake manifold gaskets on these engines. I would not recommend doing it yourself unless you are familiar with these engine, there are special torque specifications for all the bolts. I do know that the intake manifold repair job usually runs somewhere in the ballpark of $800 - $1000 or more depending on where you take it.

Hope this helps...

Sep 14, 2011 | Pontiac Grand Prix Cars & Trucks

4 Answers

I have a 2000 jimmy with the 4.3 vortec and my oil is like choclate milk which tells me I have bad head gaskets. I was told by a mechanic that it could just be the intake manifold and not the head gasket....


Yes it is possible it could just be the intake manifold and you would have to remove the intake manifold to get to the heads so either way you need to pull the intake off when you do then you will know if it is the intake manifold gaskets by inspecting the gaskets if they are bad then you will not need to pull the heads but if they look ok by visually inspecting them then you will need to go further and pull the heads so not pulling the intake manifold is not an option it has to come off anyway.

Feb 09, 2011 | 2000 GMC Jimmy

1 Answer

I have a 2001 isuzu rodeo ls. I was told that i need to replace the manifold gaskets. My husband did the top of the manifold gaskets. and it is still idling up and down. Is it easy to replace the...


This would be the intake manifold gasket that needs replaced if the diagnosed correctly. It is on the top of the engine. If your husband properly replaced the intake manifold gasket and you still have the problem then the diagnosis was wrong and something else is the problem.

Jan 08, 2011 | 2001 Isuzu Rodeo

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

2 Answers

How do i change an intake manifold gasket in very easy terms it is for a 1990 Chevy suburban Scottsdale?


You unbolt the intake manifold, remove the old gasket, install a new gasket, and bolt the maniforld back on.

You may have to remove sensors or hoses that block removal of the intake manifold.

you'll need a torque wrench when you bolt the manifold back on

Sep 24, 2009 | 1990 Chevrolet Suburban

1 Answer

Removing starter from toyota corolla 1998


No. Removal of the intake manifold is not an attractive option.
...That will cost you more time and money in the long run.
You will need to replace the intake manifold gasket, and several others.

Jan 15, 2009 | 1998 Toyota Corolla

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