In order to get the nut loose you will have to use a crow foot with an extension and breaker bar to get it loose. The space is limited and this is the only way to break it loose.
How to Identify and Fix Common car Problems ?
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The EGR valve is located in the engine compartment (underneath the hood).
What the P0400 code means. P0400 is an OBD-II generic code that the engine control module (ECM) detected the engine exhaust gas recirculation (EGR) valve is not flowing recirculated exhaust gases when it is commanded to open the flow of gases into the intake manifold.
The EGR system is an emission control device designed to recirculate exhaust gas into the engines air intake system and back to the combustion chamber to control nitrogen oxides or NOx.
The Exhaust Gas Recirculation (EGR) system is a part of the vehicle emission control. It directs a portion of exhaust gases back into the engine intake to lower the combustion temperature, read more how the EGR system work. The code P0400 is set when the EGR system flow is less than expected.
Where are these sensors located? Mechanical EGR valve position sensors are mounted on the top of the EGR valve. EGR pressure sensors will be located close to the EGR valve as the exhaust gas hose must be connected to the sensor as well as the valve.
EGR flow rate can be inferred by the difference between the fresh airflow into the intake system and the charge flow from the intake system into cylinder.
Technically you can drive without a working EGR valve
It won`t affect the health of your engine, but it will hurt the environment. The role of your EGR valve is to reduce the number of toxic NOx gases in the air, so if it isn`t working quite right, more toxic gases will be released into the air.
Removing the EGR valve is going to improve the efficiency and performance of your vehicle and it is going to be a lot more powerful. The EGR valve, while a well-intentioned design feature is impractical in the sense that it sacrifices the performance of the engine in order to ultimately work against its own goal.
What does the P0401 OBD-II diagnostic code mean? Also known as insufficient EGR flow, this particular OBD-II trouble code indicates the engine control module (ECM) has detected the exhaust gas recirculation (EGR) valve is not allowing sufficient flow of recirculated exhaust gases into the engine.
Low pressure EGR, also known as long route EGR, consists of taking part of the exhaust gases from the DPF outlet and introducing them at the compressor inlet. As in the case of the high pressure architecture, a valve controls the flow through the low pressure EGR duct by using the air mass flow measurement.
If possible, check the movement of the valve stem at 1500 to 2000 rpm. The valve stem should move if the valve is functioning correctly – if not, and there`s vacuum, there`s a fault. Apply vacuum directly to the EGR valve using either a hand vacuum pump or scan tool depending on the type of EGR valve.
The EGR valve is activated by the engine control unit. The exhaust gas recirculation rate is controlled depending on the engine speed, coolant temperature and engine load. Solenoid to a fused voltage supply, battery or power supply, connect with 12.0 to 13.5 volts.
The failures are usually caused by a build-up of deposits in the EGR valve over a period of time that causes them to stick. This build-up is part of the ordinary operation of the vehicle and should be regarded as a serviceable item requiring repair or replacement.
Car care experts recommend cleaning your car`s EGR valve after driving 45,000 to 50,000 miles to maintain it better.
An average car`s EGR valve has a lifespan of approximately 10 years in service. Proper maintenance of the valve is a must if you want to avoid any performance related issues on your car. If you notice a smell of fuel that comes out from under the hood or rough idling, then it might be time to replace the valve.
The EGR valve is activated by the engine control unit. The exhaust gas recirculation rate is controlled depending on the engine speed, coolant temperature and engine load.
You can try spraying an EGR cleaner into the valve while the engine is on and revving at 2000 RPMs. Don`t spray too much at one time, however. Allow the engine to recover between sprays. And wear gloves as well—the spray is meant to remove carbon particles, so imagine what it will do to your skin!
On some heavy duty engines the EGR mass flow is directly measured with a Venturibased sensor and a closed loop control system maintains EGR flow. However, on most light duty diesel engines the EGR mass flow must be estimated.
Increased NOx emissions: when the EGR valve remains shut, the resultant high temperatures in the combustion chamber will leave a lot of unburned fuel in the exhaust, leading to increased NOx emissions and reduced fuel efficiency.
EGR Deletes and Horsepower. People want EGR deletes mainly to boost horsepower and increase performance. However, whether deleting the EGR boosts horsepower is not a simple question. First, the EGR works with other systems so that an EGR delete can result in reduced horsepower.
Deleting or disabling your EGR is unlikely to add horsepower because it only provides a slight change to the air contents of your engine`s combustion chambers. While EGR deletes do provide a purer air-fuel ratio, the difference is minor, and any horsepower gains will be small – likely in the range of 0-5 HP.
To Clean A Mechanical EGR Valve
Remove the vacuum hose and inspect closely for wear (cracks or weak spots), then clean out the carbon deposits either with a spray can of carburetor cleaner or with a pipe cleaner if the deposits are hardened or compacted.
The specific heat of the EGR is much higher than fresh air, hence EGR increases the heat capacity (specific heat) of the intake charge, thus decreasing the temperature rise for the same heat release in the combustion chamber, %EGR = volume of EGR total intake charge into the cyclinder × 100.
Engine overheating: if coolant flow is restricted, the EGR cooler is unable to cool the exhaust gases. This not only allows NOx emissions to continue, it also causes overheating which can cause serious damage.