When to open and close the EGR valve?

When to open and close the EGR valve?

The valve itself basically has two settings: open and closed. It should normally remain closed when the engine is starting up, at low speeds and idling. Once the engine reaches operating temperature and is put under load, it should open and allow air to pass. But it can also become stuck.

What should the EGR valve look like at idle speed?

So, most older (EGR) systems use a vacuum regulated valve. On the other hand, newer vehicles tend to have an electronic valve, to control exhaust gas recirculation. So, at idle speed the valve, should look closed.

How is exhaust gas circulated in an EGR system?

Most EGR systems have a by-pass valve integrated with the EGR cooler. When the engine is cold, the exhaust gas is circulated directly into the engine.

Why does the fuel management light stay on when the EGR is open?

This means the amount of hydrocarbon gases emitted from the tailpipe increases significantly producing a fuel smell. Your engine management light may stay on once your car detects an issue with the EGR valve. This could be caused when the EGR is either constantly closed or open.

What’s the code for an EGR valve throw?

What code will an EGR valve throw have? The P0401 trouble code is related to your car’s exhaust gas recirculation (EGR) system, which controls an engine and reduces emissions. Suppose a computer-controlled valve gives a certain amount of gases back into your engine to be burnt with the air-fuel mixture.

Why does my car idle when the EGR valve is not open?

As long as your EGR valve fails to open or close, your engine won’t idle properly, which implies that there is not enough gas entering the vehicle’s internal combustion chamber. This is the reason why your vehicle will idle roughly.

Why is there an EGR code on my Ford?

However, we often find EGR codes on Ford products caused by inexpensive plastic parts that falsely report position to the control module. Several technical service bulletins for a wide variety of different makes and models have documented different problems associated with the EGR valve system.

What is exhaust gas recirculation ( EGR ) used for?

In internal combustion engines, exhaust gas recirculation (EGR) is a nitrogen oxide (NOx) emissions reduction technique used in petrol/gasoline and diesel engines.