Question about 1998 Chevrolet Cavalier

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What would cause the egr valve on a 1998 chevy suburban 4x4 5.7engine to keep shorting out ?

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  • 130 Answers

Electronic egr valves primarily gm viehicals .employ a egr valve that is not operated by vacume at all .an electronic solenoid in the valve is operated electricaly by the ecm .diagnosting this type if egr valve require a special scan tool . sorry your probley off to the dealer pal.

Posted on May 06, 2014

  • Daniel wettstein May 06, 2014

    When you take it off dose it and turn it over dose it have 3 holes in the bottom if it dose it is a three stage EGR when you have that you can have a shorted EGR I have run in to that before and then have to replace the EGR . Hope this helps good Luck

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6 Suggested Answers

6ya6ya
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SOURCE:

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Posted on Jan 02, 2017

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MrScary66613
  • 1990 Answers

SOURCE: Shifter cable broke in 1998 chevy suburban

Ok, Disconnect it from the Tranny First. This will make it easier to Fish Through. Connect the New Cable on the Tranny. Follow where the Old one Goes with the New one, Removing the Old one as you go. It will enter the Cab and work it's way up to the Sterring Column. You will Need to remove the Dash Panel to Access the Cable on the Shifter, It just Pulls Loose. You are at the Hardest Part of this at this Point. Let me know if you cannot access the Shifter From this Point. Please Rate My Response! Thanks!

Posted on Feb 07, 2009

  • 333 Answers

SOURCE: WHERE DO I LOCATE THE EGR VALVE ON MY 2001 CHEVY IMPALA 3.8 V6

The egr valve is located at the end of a hose that plugs into youe valve cover. It is pushed right into a rubber grommet that is located in one of the valve covers. I hope this helps. don.t forget to rate my nswer, thanks

Posted on Feb 27, 2009

  • 81 Answers

SOURCE: Service engine code indicates EGR valve.

You could have a restriction in the egr ports. remove the valve. Plug the holes, start engine. 1 hole will be blowing out exhaust, the other will have large vacuum.

Posted on Mar 28, 2009

blueextc3221
  • 15935 Answers

SOURCE: FAILED EGR VALVE

The EGR valve helps your car more efficiently and completely burn fuel by recirculating a portion of your exhaust and running it through the combustion process again. This results in a cooler, more complete burn of the fuel which decreases you car's noxious emissions by prohibiting the formation of some harmful gases.

The EGR valve is vital to your car's emission controls.

When the EGR valve goes bad, it must be replaced - it cannot be repaired.

  • EGR Valve = Exhaust Gas Recirculation Valve.
  • The EGR valve controls formation of noxious emissions.
  • Rough idle and poor acceleration can be caused by a faulty EGR valve.

  • The EGR valve, or Exhaust Gas Recirculation valve, is a vacuum controlled valve which allows a specific amount of your exhaust back into the intake manifold. This exhaust mixes with the intake air and actually cools the combustion process. Cooler is always better inside your engine. The exhaust your EGR valve recirculates also prevents the formation of Nitrogen related gases. These are referred to as NOX emissions, and are a common cause for failing emissions testing. Unfortunately, your EGR valve can get stuck, causing NOX gases to build up. You'll know if your EGR valve is stuck or malfunctioning because your car will experience symptoms like rough idle and bucking on accelertaion.

    The only short term problem is a decrease in gas mileage - but it should really be replaced before sensors become sooted or your cat. convertor gets overworked prematurely.

    Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

    Posted on Apr 15, 2009

    freetek
    • 5569 Answers

    SOURCE: power loss

    Can't answer your last question but catalytic convertors that are just not working anymore won't cause any loss of power. However, if they have shattered inside (they are kind of a ceramic honeycomb) they can dump junk into the exhaust system that can eventually clog your muffler or resonator.
    Checking whether this has happened isn't difficult; after the warm up of the engine, either you or a helper needs to listen to the exhaust note. If firing of the cylinders is still distinct, the system isn't clogged with shrapnel; if it seems to hiss at higher RPMs, it is likely clogged.
    This effect is easy to miss; I've had two failures and when cold, the engine would pull fine because the chunks of ceramic would fall to the bottom of the muffler and glue together somewhat. Once hot and agitated, they would clog the muffler and cause a severe loss of power but the idle would be OK. A hill that I would normally pull at 70 MPH, I couldn't top at all; had to sit and wait for things to cool down before proceeding.
    It also seems some engines appreciate a bit of back-pressure in the exhaust system because the car gained in mileage and pulling power for several thousand miles before the clog became critical causing the mileage to fall sharply along with the power.  

    Posted on May 23, 2009

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    1 Answer

    I have codes p0404&p0405 on a 98 Chevy Malibu 2.4, what can I check and how to fix?


    codes p 0404 refers to exhaust gas recirculation (EGR) system---range /performance====causes hose leaking/blockage---wiring---EGR valve /solenoid
    code p 0405 refers to EGR valve position sensor A---low input===causes ---wiring short to ground --EGR valve position sensor ---ECM
    replace the egr system is a good option

    Mar 09, 2017 | Cars & Trucks

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    I have a 99 Chevy Suburban 1500 it is giving me a random multiple misfire code however it seems to be running nice and smooth I've changed the cap the rotor button the plugs the wires I don't know what is...


    Hello Donald!

    First of all, a lot of misfire condition are not directly linked to the ignition system of the vehicle. For instance a lazy O2 sensor (B1S1) or one with a burnt out heating element can cause the issue. One thing that is easy to check that can cause misfires is a defective EGR valve. You can remove it from the car and inspect that it closes nice and tight by pouring some fluid on the intake part of the EGR valve and see if the other side gets wet. Alternatively, you can inspect it on the vehicle. Simply start the car when the engine block is cold, let it idle and then put your finger on the base or intake side of the EGR valve and wait 2-3 minutes. If it become so hot you cannot touch it with your fingers in that 2 minute delay, it needs to be replaced. What happen is that when the EGR valve stays partly open (stuck open or simply defective), part of the exhaust gas, which are burning hot, get sucked in by the vacuum from the air intake and passes through the EGR valve and heat it up fast. A proper operating valve will not open until the engine reaches a certain temperature (usually around 80°C)and when the car is being driven, both condition only meet way after 2 minutes. If I remember right, the truck you possess (a 2 wheel drive I presume) has a 4.3L GM engine with a Vortec intake system. If so, the EGR valve should be right in front of the engine, behind the radiator fan and near the intake manifold. Also, be sure to place back the EGR valve in the same direction than it was, rotating it 180° will cause the valve to be stuck open by the engine's vacuum and WILL cause misfires. and rough idle.

    I've attached a picture of what it should look like on your truck. The arrow is pointing the front of your car by the way

    If it did solve your problem, please consider giving me some credit, doing so will help me progress in rank and providing more solutions on Fixya


    Warm regards!

    Samuel G. ,
    Automotive technician for Subaru Canada
    25419531-n40u5i5muffgozh5auiul2s4-3-0.gif

    Feb 12, 2015 | 1999 Chevrolet Suburban

    1 Answer

    1998 chevy.s10 code 405


    DTC P0405 - Exhaust Gas Recirculation Sensor A Circuit Low

    There are different designs of EGR (Exhaust Gas Recirculation) systems, but they all operate in a similar way. The EGR valve is a PCM (Powertrain Control Module) controlled valve that allows measured amounts of exhaust gasses to pass back into the cylinders to be burned with the air/fuel mixture. Since exhaust gas is an inert gas that displaces oxygen, injecting it back into the cylinder can lower combustion temperatures which helps to improve NOx (oxides of nitrogen) emissions. EGR isn't needed on cold startup or at idle. EGR is commanded on under certain conditions like startup or at idle. EGR is commanded on under certain conditions like partial throttle or decel depending on engine temperature and load, etc. Exhaust gasses are supplied to the EGR valve from an exhaust pipe or the EGR valve may be mounted directly in the exhaust manifold. When needed, the valve is commanded "on" allowing the gasses to pass into the cylinders. Some systems divert exhaust gasses directly into the cylinders while others simply inject it into the intake manifold where it is then pulled into the cylinders. while others simply inject it into the intake manifold where it is then pulled into the cylinders.

    Some EGR systems are quite simple while others are a little more complicated. Electrically controlled EGR valves are directly controlled by the PCM. A wiring harness plugs into the valve itself and is commanded by the PCM as it sees the need. These can be 4 or 5 wire. Usually 1 or 2 grounds 12 volt ignition feed, a 5 volt reference circuit, and a feedback circuit. Other systems are vacuum controlled. These are quite simple. The PCM controls a vacuum solenoid which when activated, allows vacuum to travel to the EGR valve and open it. There should also be an electrical connector on this type of EGR valve for the feedback circuit. The EGR system feedback circuit allows the PCM to see if the EGR valve pintle is actually moving as it should. If the feedback circuit detects that the voltage is unusually low, or it's position is lower than it's commanded to be, P0405 may set.


    Symptoms of a P0405 DTC may include:
    MIL (Malfunction Indicator Lamp) illumination


    Potential causes of a P0405 code include:
    Short to ground in EGR signal or Reference circuits
    Short to voltage in EGR ground or signal circuits
    Bad EGR valve
    Bad PCM wiring issues due to chafing or loose terminals


    Possible Solutions:
    If you have access to a scan tool you can command the EGR valve on. If it responds and the feedback indicates the valve is moving properly then the problem may be intermittent. Sometimes in cold weather, moisture can freeze in the valve causing it to stick. After the vehicle warms up the problem may disappear. Carbon or other debris can lodge in a valve causing it to stick also

    If the EGR valve doesn't respond to your commands with the scan tool, disconnect the EGR harness connector. Turn the key to on position, engine off (KOEO). Using a voltmeter, check for 5 volts on the reference wire to the EGR valve. If there is no 5 volts, is there any voltage at all? If there is 12 volts, then repair short to voltage in the 5 volt reference circuit. If there is no voltage connect a test light to battery voltage and probe the 5 volt reference wire. If the test light illuminates, the 5 volt reference circuit is shorted to ground. Repair as necessary. If the test light doesn't illuminate check for an open in the 5 volt reference circuit. Repair as necessary

    If there is no apparent problem and there is no 5 volt reference, PCM may be at fault, however other codes will likely be present. If 5 volts are present on the reference circuit, jumper the 5 volts to the EGR signal circuit. Now the EGR position on the scan tool should read 100 percent. If it doesn't connect test light to battery voltage and probe the EGR signal circuit. If it illuminates, then the signal circuit is shorted to ground. Repair as necessary. If the light doesn't illuminate, check for an open on the EGR signal circuit. Repair as necessary.

    If, after jumpering the 5 volt reference circuit to the EGR signal circuit the scan tool EGR position reads 100 percent, then check for poor terminal tension at the EGR valve connector. If the wiring is okay, replace the EGR valve.

    Hope this helps.

    Jun 24, 2011 | 1998 Chevrolet S-10 Pickup

    2 Answers

    I have a code P0401. What is this and how can I fix it?


    P0401 - Exhaust Gas Recirculation Flow Insufficient Detected

    Possible causes - Harness or connectors (EGR volume control valve circuit is open or shorted.)
    - EGR volume control valve stuck closed
    - EGR volume control solenoid valve
    - Dead (Weak) battery
    - EGR passage clogged
    - Exhaust gas leaks Possible solution - Clean EGR Valve
    - Repair EGR harness or connector
    - Replaced EGR volume control solenoid valve
    - Replaced EGR volume control valve

    Mar 20, 2011 | 1998 Ford Taurus

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    Chevy pickup 350 vortex code p-1406 comes up can't find what code means in my book. i know it has something to do with manufacturer control auxiliary emissions controls. i don't know where to look for the...


    DTC P1406 IS EGR VALVE PINTLE POSITION CIRCUIT MALFUNCTION CONDITIONS.POSSIBLE CAUSE EGR SOLENOID CONTROL CIRCUIT IS OPEN SHORTED TO GROUND OR TO B+ -CHECK EGR VALVE FUSE - OR THE EGR VALVE AND PCM HAS FAILED.

    Jul 09, 2010 | 2002 Chevrolet Silverado 1500

    1 Answer

    OBDII SETS CODES P0401, P0171 & P0174 . 1998 Mercury Sable


    P0401- Exhaust Gas Recirculation Flow Insufficient Dectected
    Possible causes - Harness or connectors (EGR volume control valve circuit is open or shorted.)
    - EGR volume control valve stuck closed
    - EGR volume control solenoid valve
    - Dead (Weak) battery
    - EGR passage clogged
    - Exhaust gas leaks Possible solution - Clean EGR Valve
    - Repair EGR harness or connector
    - Replaced EGR volume control solenoid valve
    - Replaced EGR volume control valve
    Code P0171- Fuel Injection System Too Lean Bank 1 Possible causes - Intake air leaks
    - Front Heated oxygen sensor may be faulty
    - Injectors may be faulty
    - Exhaust gas leaks
    - Incorrect fuel pressure
    - Lack of fuel
    - Mass air flow sensor may be faulty
    - Incorrect PCV hose connection Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem P0174- Fuel Injection System Too Lean Bank 2 Possible causes - Intake air leaks
    - Front Heated oxygen sensor may be faulty
    - Injectors may be faulty
    - Exhaust gas leaks
    - Incorrect fuel pressure
    - Lack of fuel
    - Mass air flow sensor may be faulty
    - Incorrect PCV hose connection Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem.

    Jun 28, 2010 | 1998 Mercury Sable

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    High jdle after warm up on 98 chevy k1500 4.3l v6


    egr vlve itself will cause rough idling ,stalling,stumbles during accelaration,iwould take it off clean valve ports of carbon deposits,put it back on and see,egrs are exp.enough,and like ccn7 said sounds like tps problem,but usually they give a code

    Mar 03, 2009 | 1998 Chevrolet Blazer

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    I have a 1999 chevy suburban well i


    happened to me also change the egr valve

    Feb 21, 2009 | 1995 Chevrolet K1500

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    Is there a way that i could test a egr valve (amp/volt) while unpluged 1999 chevy suburban 5.7


    nope you can go to a auto parts store and get a block off plate for the egr valve

    Jan 02, 2009 | 2003 Chevrolet Suburban 1500

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