Should EGR valve be open at idle?

The EGR valve is closed when the engine is starting up. During idle and at low speeds, only a small amount of power is required, and therefore only a small amount of oxygen, so the valve gradually opens – it can be up to 90% open at idle.

When should my EGR valve open?

When the engine is idling, the EGR valve is closed and there is no EGR flow into the manifold. The EGR valve remains closed until the engine is warm and is operating under load. As the load increases and combustion temperatures start to rise, the EGR valve opens and starts to leak exhaust back into the intake manifold.

Will EGR cause no start?

The exhaust gas recirculation (EGR) valve introduces a measured amount of exhaust gases; into the intake manifold to get re-burned. But, the valve can fail and stick either open or closed. When the valve sticks open it may prevent your engine from starting.

Can I drive with a bad EGR valve?

Can I drive with a bad EGR valve? Technically, you can drive your vehicle with a bad EGR valve, but your vehicle will run rough, shake at idle, and a check engine light will be illuminated. You might also hear popping sounds while driving down the road.

What should EGR position be at idle?

The EGR valve has two primary settings: open and closed, although the position can vary anywhere in between. During idle and at low speeds, only a small amount of power is required, and therefore only a small amount of oxygen, so the valve gradually opens – it can be up to 90% open at idle.

What happens if you unplug EGR valve?

If you unplug it, while the truck is off, then the EGR will stay closed. If the EGR valve is clogged or completely blocked off it can longer re-burn harmful emissions in the combustion chamber. You can improve your fuel efficiency with an EGR delete.

What happens when you unplug your EGR?

Does a bad EGR valve make noise?

Another symptom of a bad or failing EGR tube is rattling noises from the engine bay. If the EGR tube breaks or comes loose, it can cause rattling noises as a result of the metal tube vibrating. The noise may be quiet at idle, and become more noticeable when accelerating.

What happens if EGR is not working?

What are the symptoms of a failing EGR valve? A faulty EGR valve can cause problems with the flow and operation of the EGR system leading to performance issues including a reduction in power, reduced acceleration and decreased fuel efficiency. It can also cause vehicle emissions to increase.

Can you drive on a bad EGR valve?

How much does it cost to replace the EGR valve?

The Best in Auto Repair The average cost for EGR valve replacement is between $314 and $399. Labor costs are estimated between $77 and $97 while parts are priced between $238 and $302. This range does not include taxes and fees, and does not factor in your specific vehicle or unique location.

What causes a rough idle with an EGR valve?

Rough idle. One of the most common symptoms of a problem with the vehicle’s EGR valve is a rough idle. It is not uncommon for EGR valves to malfunction and become stuck in the open position. This can lead to exhaust gas recirculation to occur causing a rough idle even when the conditions are not desirable.

What should I do if my EGR is not working?

Common EGR problems include: Pinging (spark knock or detonation) because the EGR system is not working, the exhaust port is plugged up with carbon, or the EGR valve has been disabled. The fix here is to inspect the EGR system, remove the EGR valve and check the valve and port for carbon, and remove the carbon from the port if it is plugged.

What happens when the EGR passageway is blocked off?

When the EGR passageway becomes blocked off it keeps exhaust emissions and air from circulating in the engine, causing a suffocating condition. The engine idle will be rough, frequently stumbling and unable to hold a steady idle rpm. The rpm may be sporadic, raising and lowering randomly.

How is the EGR valve on an OBD 2 engine controlled?

If it is not, it can make for hard starting when the engine is cranked. On most OBD II vehicles, the EGR valve is controlled by the powertrain control module. If teh engine has a vacuum-operated EGR valve, the PCM controls a solenoid in the vacuum line to open and close the valve. The PCM may cycle the solenoid on and off to vary the EGR flow rate.