Asked by: Yahui Alcahut
automotive auto repair

How is EGR valve controlled?

Last Updated: 26th May, 2020

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When the EGR valve opens, the temperature on theintake side rises from the hot exhaust gases. The PCMcontrols the EGR flow by opening or closing theEGR valve with a step motor. The EGR flow ismonitored by the manifold absolute pressure (MAP) sensor, mass airflow sensor and the air/fuel ratio sensor.

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In this way, what controls an EGR valve?

Intake vacuum in the intake manifold sucks exhaust backinto the engine. Most older EGR systems use a vacuumregulated EGR valve while newer vehicles tend to have anelectronic EGR valve to control exhaust gasrecirculation. When the engine is idling, the EGR valveis closed and there is no EGR flow into themanifold.

Beside above, does removing EGR increase power? Consider an EGR delete kit. Benefits includelowering engine temperature, better fuel mileage andincreased horsepower. It helps reduce the amount of Nitrogenoxides produced by the engine at extreme operatingtemperatures.

Keeping this in consideration, what are the symptoms of a faulty EGR valve?

Here are the symptoms of a faulty EGR valve to look outfor:

  • Poor engine performance. A bad EGR valve is likely to haveissues with the engine's performance.
  • Look out for the engine warning light.
  • Fuel odor.
  • Failed emission test.
  • Rough idle.

What code will a bad EGR valve throw?

EGR valves can malfunction by becomingstuck open or closed due to carbon buildup. When the troublecode P0401 is set, CO2 is reintroduced to thecombustion chamber at the incorrect time or in incorrect amounts,which does not decrease the combustion temperaturesufficiently enough to prevent the increase ofNOx.

Related Question Answers

Vivek Caicoya

Professional

What happens if EGR valve is blocked?

Another common sign of a bad EGR valve is engineperformance issues. A clogged or malfunctioning EGRvalve can disrupt the vehicle's air-fuel ratio, which can causeengine performance issues such as a reduction in power and fuelefficiency. The vehicle may also stall or hesitate whileaccelerating.

Anam Reineking

Professional

How do you test an electric EGR valve?

How to Test an Electric EGR Valve
  1. Turn the vehicle off and remove the key from the ignition.Allow the EGR valve ample time to cool down.
  2. Open the hood and locate the EGR valve. The valve is mounted onthe exhaust manifold.
  3. Turn the multimeter on and set the dial to "Volts DC."
  4. Turn the ignition key to the "On" position.

MontaƱa Vellisca

Explainer

Where is the EGR valve located?

The EGR valve is located in the enginecompartment (underneath the hood). Most engines require exhaust gasrecirculation to meet emissions standards.

Kauan Harin

Explainer

Can you clean an EGR valve?

To clean your EGR valve, start bycleaning the vacuum hose with carburetor cleaner or apipe cleaner. Then, unbolt the valve, andclean the return tube and entry port using carburetorcleaner, and a toothbrush or pipecleaner.

Ivaneide Janitschke

Explainer

What is a EGR sensor?

The EGR system works by recirculating exhaustgases back into the engine in order to lower cylinder temperaturesand NOx emissions. The EGR pressure feedback sensor,also known as the delta pressure feedback sensor, is asensor that detects the pressure changes in the EGRsystem.

Clodomiro Zhdanovsky

Pundit

How do you clean an EGR valve?

EGR Valve Cleaning
  1. Spray carbon deposits with EGR-valve or carburetorcleaner.
  2. Use a dull scraper and a pipe cleaning brush to scrub carbonbuildup.
  3. To deal with rock-hard buildup, leave the valve soaking in thecleaning solution for a few minutes.
  4. Repeat step 3 to fight stubborn carbon deposits.

Xuhong Reifman

Pundit

What problems does a clogged EGR valve cause?

One of the first symptoms of a problem with the EGRvalve is engine performance issues. A clogged ormalfunctioning EGR valve can disrupt the vehicle's air-fuelratio, which can cause engine performance issues suchas a reduction in power, acceleration, and even fuelefficiency.

Elisardo Defosse

Pundit

Does EGR valve effect Turbo?

The EGR (Exhaust Gas Recirculation)valve directs a small amount of exhaust gases back into theinlet air charge, and lowers the maximum temperature of the burningfuel. The EGR valve is likely to stick and become coked upon some applications. This can have a significant effect onthe performance of the turbocharger.

Mathilda Abbate

Pundit

What is the use of EGR valve?

A widely adopted route to reduce NOxemissions is Exhaust Gas Recirculation (EGR). Thisinvolves recirculating a controllable proportion of the engine'sexhaust back into the intake air. A valve is usuallyused to control the flow of gas, and the valve may beclosed completely if required.

Naike Riego

Pundit

How much is a EGR valve?

Having the EGR valve replaced on your car shouldcost between $147 to $548, which will cover the costof parts an labor. You can pick up the valve itself foranywhere between $70 and $490, depending on the type of car you ownand what part you buy.

Jatin Latzuregui

Teacher

Is EGR bad for the engine?

EGR: Diesel's Necessary Evil. While“cooled” exhaust gas might not sound bad, dieselengines benefit tremendously from heat. When taking some ofthat in-cylinder heat away (i.e. utilizing EGR), NOx andhydrocarbon pollutants are reduced, but it comes at the expense ofdecreased engine performance and efficiency.

Erenia Rietzschel

Teacher

Why is EGR required?

Because nitrogen oxide forms primarily when a mixture ofnitrogen and oxygen is subjected to high temperature, the lowercombustion chamber temperatures caused by EGR reduces theamount of nitrogen oxide the combustion generates (though at someloss of engine efficiency).

Lima Hertzmark

Teacher

How do I know if my EGR valve is stuck open?

If the EGR Valve Sticks Open:
  1. A rough idle upon starting the engine (that is, when the engineis cold) and sometimes at a stop light or while looking for a spotin a parking lot (that is, at low engine speeds in a warmed-upengine).
  2. Stalling when the engine idles.
  3. Increase in fuel consumption.

Lahcen Beutlrock

Teacher

What types of EGR valves are there?

There are 5 types of EGR valves used; Thenegative backpressure EGR valve, positive backpressureEGR valve, Ported EGR valve, Integrated ElectronicEGR valve and the Digital EGR valve. The principle ofall systems is the same; the only difference is in the method usedto control how far the EGR valve opens.

Jubal Yzura

Reviewer

Does EGR improve gas mileage?

The second component that has a negative effect on fuelmileage is the Exhaust Gas Recirculation Valve(EGR). This is an emission control device that aims tocontrol the emissions known as Oxides of Nitrogen (NOx). NOxemissions are bad for the environment and are a major contributorto pollution and poor air quality.

Espiritu Marzi

Reviewer

How does the EGR solenoid work?

When the EGR control solenoid isactivated, a passage is opened up that allows exhaust gases intothe intake manifold. The EGR solenoid is controlled by theengine computer, and activated at very specific times in order toachieve the best performance, efficiency, and emissions from theengine.

Mikalai Sharf

Reviewer

Can a bad EGR valve cause transmission problems?

A faulty EGR valve can cause several troublesymptoms to appear. These directly relate to the operationof the engine and emission systems with no effect on the automaticoverdrive (AOD) transmission, driveline ornonemission-related equipment.

Kary

Reviewer

How long do EGR valves last?

Average Life of EGR Valves
An EGR valve may last 100,000 miles ifthe part is designed well, or it may last only 30,000miles.

Wail Aharrar

Supporter

Can a bad EGR valve cause overheating?

Engine overheating
One of the first symptoms of a potential problemwith the EGR cooler is engine overheating. Thiscan cause the unit to overheat, at which point itwill not be able to cool the exhaust gases, and the enginewill overheat as a result.