Question about 1999 Pontiac Montana

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Removing and cleaning egr valve - 1999 Pontiac Montana

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  • Pontiac Master
  • 2,359 Answers

Check for

vacuum leaks on intake manifold,

the air tube between the air filter.

intake manifold vacuum hose.

===
clean throttle plate with Berryman carburator cleaner

SEE sample picture HERE
===

Also remove carbon built up behind the EGR valve and the EGR passage tube.

===

Vacuum leak WILL offset the intended 14.7 to 1 air fuel ratio.

More un-metered air (leaks) will lean out the fuel mixture.

Use small amount of Berryman carb clearer at potential air leak area will help you identify trouble spot.

At idle,just spray and listen for the RPM surge.

The in-rush of carb clearer will increase the RPM on the motor.

Record the problem spot(s) and address it later.

===

EGR carbon built up require 2+ hours to clean from start to finish.

You will need a new EGR base gasket before your start.

Locate and remove the EGR valve after the vehicle is cool down.

Carefully record the connector and vacuum line (for older vehicle) location by drawing an easily to follow diagram.

Remove the EGR valve.

Inspect the location of the carbon built-up inside the valve and the EGR passage tube.

SOAK these areas with WD-40 spary.

You will need a small screwdriver,cloth hanger and lot of newspaper and time to get this cleaning done right.

RE-SOAK the carbon and let it sit for over-night will also help.

One the last round,pass a shop vacuum of the EGR valve and the passage pipe.

Install the new EGR gasket and connectors.

Allow the vehicle to warm up outdoor to burn up any remaining WD-40.


Take it for a test drive.


Please rate my answer if it's useful to you.


Cheers,

Mustgo

Posted on Dec 19, 2009

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  • Pontiac Master
  • 3,854 Answers

There is one bolt that holds the egr tube to it and two bolts that hold it to the intake manifold take them out, unplug the electrical connector and its off.  Once the EGR is off, Spray it clean with Carb cleaner and make sure that there are no moving parts are binding and re-install. If needed replace the old gasket with a new one. Good luck and hope this helps and if your not sure where the EGR valve is, it's just behind the throttle body. Good luck and hope this helps. 

Posted on Jul 03, 2009

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Posted on Jan 02, 2017

jgwhomeequip
  • 1902 Answers

SOURCE: EGR Valve Cleaning on a 1999 4.3 Silverado

If it is not just badly clogged, the intake does not need to be cleaned out. If you want to clean it out then take some brake cleaner and spray it in there and wipe it with a rag. I have never seen someone have to clean the intake due to not being clogged. Just my expierence I would just change the EGR and go from there

Posted on May 21, 2009

greg_margo
  • 1959 Answers

SOURCE: EGR Valve needs cleaning or replacing

The link below is a diagram of the EGR valve. Looks like a mushroom with vacuum lines attached.

http://www.chiltonlibrary.com/content/images/8666/images/86664018.gif

Instructions:

  • Label and disconnect the hoses from the valve. Carefully loosen and remove the retaining bolts, remembering that they are probably heat-seized and rusty. Use penetrating oil freely.
  • Remove the valve and clean the gasket remains from both mating surfaces.
  • Inspect the valve for any sign of carbon deposits or other cause of binding or sticking. The valve must close and seal properly; the pintle area may be cleaned with solvent to remove soot and carbon.

  • I hope this answers your question. Best of luck.
    Greg

    Posted on May 30, 2009

    kel1guy2002
    • 3740 Answers

    SOURCE: How to clean EGR valve passages in 1993 Isuzu Trooper DOHC V6

    You have to the EGR valve (sometimes the Intake manifold to EGR Vlalve line also). After you remove it take a drill bit the about 20 % smaller than the actual hole of the outlet side and rotate the drill bit with your hand to dig out the carbon. Aditionally the line coming from the intake manifold to the EGR valve will clog near the connection to the EGR valve. I use either a single piece of copper wire or the wire that you would use to tie ribar together to clean the line. When your done cleaning take a piece of vacuum line and connect it to the diaphram side and **** on it... then plug the line well with your thumb. Grasp the valve and blow thru it... Air should blow thru it freely. Remove your thumb from the vacuum line and try blowing again.. No air should pass thru the valve.
    Then reinstall the valve and start the vehicle with the vacuum line disconnected (but blocked off) Use another piece of vacuum line connected to the diaphram again and **** on the line.. The vehicle should die or run really bad. If it does this then you cleaned it correctly.

    Posted on Jan 20, 2010

    pugwash814
    • 377 Answers

    SOURCE: Lack of power, exhaust smoke and engine miss

    Just an idea but the Ford Mondeo ( european car ) from which I believe your engine
    is taken has a habit of splitting a low pressure tube at the back
    of the engine this is a relatively
    cheap, easy fix. The other symptom this used to throw up was a
    little more black smoke from the exhaust and a pacing/ surging from
    the engine.

    Posted on Mar 27, 2010

    saailer
    • 1868 Answers

    SOURCE: egr valve cleaning

    Hello! Cleaning works at times...The EGR is bolted to the back-side of the intake manifold...Two bolts hold it in place...More than likely it's fouled with carbon...However, looking at the age of the vehicle I would recommend replacing it...
    Auto Zone sells them for $74.99...The part # is EGR3173...Guru........Saailer

    Posted on May 08, 2010

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    1. Install a tachometer on the engine, following the manufacturer's instructions.
    2. Detach the engine wiring harness connector from the Idle Air Control (IAC) solenoid.
    3. Disconnect and plug the vacuum supply hose from the EGR valve.
    4. Start the engine, then apply the parking brake, block the rear wheels and position the transmission in Neutral.
    5. Observe and note the idle speed.
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    EGR Valve Removal & Install
    3.0L OHV (2 valve) and 3.4L SHO engines

    b9175c5.jpg

    Fig. : EGR mounting-3.0L OHV (2 valve) engine

    5fcd84e.jpg

    Fig. : EGR mounting-3.4L (SHO) engine

    4552fc2.jpg

    Fig. : Remove the two retaining bolts and...

    b849310.jpg

    Fig.: ... remove the valve from the intake manifold

    795549d.jpg

    Fig.: Thoroughly clean the mating surfaces of the manifold and the EGR valve (if being reused)
    1. Disconnect the negative battery cable.
    2. Remove the vacuum hose from the EGR valve.
    3. Using a 22mm wrench or crowfoot, disconnect the EGR valve-to-exhaust manifold tube from the EGR valve.
    4. Remove the EGR valve mounting fasteners, then separate the valve from the intake manifold.
    5. Remove and discard the old EGR valve gasket, and clean the gasket mating surfaces on the valve and the intake manifold.
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    2. Connect the EGR valve-to-exhaust manifold tube to the valve, then tighten the tube nut to 26-47 ft. lbs. (35-65 Nm).
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    d8a563e.jpg

    Fig. : EGR mounting-3.0L OHC (4 valve) engine
    1. Disconnect the negative battery cable.
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    5. Remove and discard the old EGR valve gasket, and clean the gasket mating surfaces on the valve and the intake manifold.
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    2. Connect the EGR valve-to-EGR tube, then tighten the retaining nuts.
    3. Connect the vacuum hose to the EGR valve.
    4. Connect the negative battery cable.

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    prev.gif next.gif Exhaust Gas Recirculation (EGR) Valve Removal & Installation 2.0L Zetec Engine NOTE: When the EGR tube is disconnected from the EGR valve, it must be discarded and a new EGR tube must be installed. The aluminum threads on the EGR valve must be inspected, and a new EGR valve installed if the threads are damaged.
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    Detach the vacuum line (#1), unthread the EGR tube (#2) and remove the EGR valve bolts (#3) - 3.0L (4V) 02-04_escape_emissions_023.gif

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    2. Detach the engine wiring harness connector from the Idle Air Control (IAC) solenoid.
    3. Disconnect and plug the vacuum supply hose from the EGR valve.
    4. Start the engine, then apply the parking brake, block the rear wheels and position the transmission in Neutral.
    5. Observe and note the idle speed.
    If the engine will not idle with the IAC solenoid disconnected, provide an air bypass to the engine by slightly opening the throttle plate or by creating an intake vacuum leak. Do not allow the idle speed to exceed typical idle rpm.
    Using a hand-held vacuum pump, slowly apply 5-10 in. Hg (17-34 kPa) of vacuum to the EGR valve nipple.
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    EGR Valve Removal & Install
    3.0L OHV (2 valve) and 3.4L SHO engines

    b9175c5.jpg

    Fig. : EGR mounting-3.0L OHV (2 valve) engine

    5fcd84e.jpg

    Fig. : EGR mounting-3.4L (SHO) engine

    4552fc2.jpg

    Fig. : Remove the two retaining bolts and...

    b849310.jpg

    Fig.: ... remove the valve from the intake manifold

    795549d.jpg

    Fig.: Thoroughly clean the mating surfaces of the manifold and the EGR valve (if being reused)
    1. Disconnect the negative battery cable.
    2. Remove the vacuum hose from the EGR valve.
    3. Using a 22mm wrench or crowfoot, disconnect the EGR valve-to-exhaust manifold tube from the EGR valve.
    4. Remove the EGR valve mounting fasteners, then separate the valve from the intake manifold.
    5. Remove and discard the old EGR valve gasket, and clean the gasket mating surfaces on the valve and the intake manifold.
    To install:
    1. Install the EGR valve, along with a new gasket, on the upper intake manifold, then install and tighten the mounting bolts to 15-22 ft. lbs. (20-30 Nm).
    2. Connect the EGR valve-to-exhaust manifold tube to the valve, then tighten the tube nut to 26-47 ft. lbs. (35-65 Nm).
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    d8a563e.jpg

    Fig. : EGR mounting-3.0L OHC (4 valve) engine
    1. Disconnect the negative battery cable.
    2. Remove the vacuum hose from the EGR valve.
    3. Remove the two EGR tube-to-EGR valve retaining nuts.
    4. Remove the EGR valve mounting fasteners, then separate the valve from the intake manifold.
    5. Remove and discard the old EGR valve gasket, and clean the gasket mating surfaces on the valve and the intake manifold.
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    3. Connect the vacuum hose to the EGR valve.
    4. Connect the negative battery cable.

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    1 Answer

    Check engine light on when check it insufficent EGR valve


    yes the passages can be cleaned. They pass exhaust gas into the intake maniflod for reburning.

    It could be the DPFE that controls the EGR too. Diff. Pressure Feedback EGR.

    there is also a vacuum regulator valve and a solenoid too.

    Please rate as fixya if this helps.

    ----------------
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    2d0d879.gif
    --------------------------------------
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    e56a6e2.gif
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    REMOVAL - 2.4L The EGR valve and Electrical EGR Transducer are serviced as an assembly.
    1. Disconnect vacuum tube from electric EGR transducer. Inspect vacuum tube for damage.
    2. Remove electrical connector from solenoid.
    3. Remove EGR tube bolts from EGR valve.
    4. Remove EGR valve from cylinder head adaptor.
    5. Clean gasket surface and discard old gasket. Check for any signs of leakage or cracked surfaces. Repair or replace as necessary

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