The Exhaust recirculation (EGR) system redirects a tiny amount of exhaust gases earlier into the engine entry to lower the burning temperature.

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Honda EGR valve. Click for the bigger photo. Check out also: Toyota EGR valve
The EGR valve is the key component that this system. The controls the flow of exhaust gases native the exhaust manifold into the entry manifold. Watch the diagram. In part cars, an EGR valve is controlled by a vacuum. In most contemporary cars, the EGR valve is operated by a built-in electric step motor. The EGR flow is at its peak throughout steady cruising. The EGR system circulation is monitored by numerous sensors. If the EGR flow is much more or less than expected, the engine computer turns on the inspect Engine light. Read how the EGR mechanism works in this article.
EGR system. Click because that the bigger image.
The most typical problem v an EGR valve is as soon as carbon develop up ~ above the valve reason it come stick (see the photograph below). In worst cases, an EGR valve and the EGR passages have the right to be fully clogged up. Symptom of one EGR valve that is stuck open include rough turbulent idle and stalling. Regularly a auto stalls when stopping ~ exiting the highway. If the EGR system is clogged up, or the valve is grounding closed, the burning temperature increases. This may cause pinging (detonation), and also surging on light acceleration. In a diesel engine, a poor EGR valve is just one of the causes of a black smoke. The examine Engine irradiate might likewise come top top in one of two people case.

Common EGR valve problems

EGR valve difficulties are common in both, gasoline and diesel engines. In 2005 and later evade Caravan and also Chrysler town & Country, the password P0404 deserve to be caused by a fail EGR valve. View some YouTube videos explaining the repair. In some early on Dodge ram trucks with a 5.7L V8, the code P0406 could also be brought about by a failure EGR valve. View these YouTube videos for an ext info.
Carbon buildup reasons an EGR valve to stick
EGR valve failures resulting in the code P0401 were typical in the Mazda CX-7 vehicles through a 2.3L turbo engine. In countless Mazda/Ford 4-cylinder engines, the password P0401 can be brought about by a sticking EGR valve. The EGR valve must be replaced to fix the problem. No all EGR troubles are led to by a failure EGR valve. Clogged EGR passages can reason problems similar to a bad EGR valve. In part older Ford vehicles, part EGR password were led to by a poor DPFE sensor. Review more: password P0401. Another problem v an EGR valve is once it gets burned through or "explodes". This regularly happens when a clogged-up catalytic converter reasons increased press in the exhaust manifold.

Check Engine problem codes related to EGR valve

through far, the most regular code pertained to the EGR valve is P0401 Exhaust Gas Recirculation circulation Insufficient. It way that over there is not sufficient EGR flow because of carbon buildup, stuck closed EGR valve or for other reasons. Check out more: P0401 Exhaust Gas Recirculation flow Insufficient.
The password P0400 Exhaust Gas Recirculation Flow and P0402 Exhaust Gas Recirculation Flow extreme are also often regarded the EGR valve. Password P0403 Exhaust Gas Recirculation Circuit malfunction and P0404 Exhaust Gas Recirculation Circuit Range/Performance explain electric problems with the EGR valve circuit. The password P0403-P0408 can be resulted in by electrical difficulties with the wiring, problems with a temperature sensor or an EGR regulate solenoid and also a failed sensor within an EGR valve. Even trouble codes related to the punch sensor (e.g. P0325 knock Sensor Circuit Malfunction) could be resulted in by a detonation (pinging) as a result of a clogged increase EGR valve.

EGR valve testing

experimentation a vacuum-operated EGR valve
A vacuum-controlled EGR valve is easy to test with a hand-held vacuum pump (see the image). If the EGR valve opens and also the vacuum holds for more than a minute, the EGR valve works. If a vacuum diaphragm within the EGR valve is leaking, the vacuum will drop. Once the vacuum is released, the valve have to close fully. Vacuum lines and also the manage solenoid need to be experiment too. In enlarge Toyota vehicles, because that example, a failure EGR control solenoid (VSV) can cause the password P0401. Replacing the VSV is a lot cheaper repair.
Ford vacuum-operated EGR valve. Click for the larger photo.
Many modern cars space equipped through an electrically-controlled EGR valve. There is no a scan tool, it"s an overwhelming to test. Mechanics in ~ a dealership check an electrically-controlled EGR valve when the engine is to run at idle. Opened the EGR valve through a scan tool should cause the idle to become unstable and also rough. One engine might even stall. Closeup of the door the valve completely with a scan tool have to return the engine to the secure idle speed. In a diesel engine, opening and closing the EGR valve with a scan tool or a vacuum pump when the engine is running, have to cause adjust in the mass air flow sensor readings. If there is no change, the EGR valve is most most likely stuck or clogged up.
It"s feasible to inspect the resistance in between the EGR valve terminals making use of a multimeter or activate the EGR valve indigenous a 12V power source to view if that operates. You can find the testing direction in the factory service manual. We posted several web links in this short article where you have the right to get access to a manufacturing facility repair hands-on for a subscription fee. Often, one EGR valve could work while testing, however stick intermittently. Once there is a hesitation that the EGR valve is sticking, or it mirrors carbon buildup, it is usually replaced along with a brand-new gasket ($50-$320 parts, to add $90-$320 labor). Aftermarket components are cheaper. At any time the EGR valve is removed, the EGR passages should be checked for carbon buildup.

EGR valve bulletins

The GM bulletin 15-NA-035 because that the 2014-2015 Chevy Cruze through a 2.0L Diesel advises the a stuck-open EGR valve can reason the engine to stall or not to start. The fix is to change the EGR valve. The BMW issued the Emissions Recall campaign for the X5d (E70) and also 335d (E90) Diesel models the were produced from April 2009 come March 2011. The EGR valve have to be replaced with an to update part. The Toyota bulletin T-SB-0027-16 because that 2010-2012 Prius models defines a vibration and also tapping noise in ~ a cold begin that deserve to be caused by a difficult EGR valve because of carbon buildup. The repair contains reprogramming the engine ECU, replacing the EGR valve and modifying the wiring harness. The FCA bulletin X63 prolonged the warranty for the EGR valve in the 2012-2013 Dodge ram 1500 through a 4.7L Magnum V8 come 6 years, 100,000 miles.


number of manufacturers authorize recalls and also software updates regarded the EGR valve. Chrysler approve the campaign P49 to replace the EGR cooler water tap in the 2011-2013 Jeep grand Cherokee through a 3.0L Diesel engine. FCA (Chrysler) announced the campaign T23 to reprogram the PCM because that the 2016-2017 Jeep grand Cherokee, evade Durango and 2017 Chrysler Pacifica with a 3.6L engine.

Can friend clean a clogged increase EGR valve?

come clean one EGR valve, the will have to be removed. In some cars it"s easy, in others it takes a the majority of work. In our experience, clean the EGR valve is more of a temporary solution. Plus, aftermarket components are not an extremely expensive. You can buy one EGR valve along with a brand-new gasket because that an enlarge Ford or Toyota for together low together $30 plus distribution on Amazon. An old EGR valve gasket have the right to be damaged too. Given that, us recommend instead of the EGR valve and also the gasket rather of cleaning it. The course, if you want to recognize more, there are plenty that

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