Asked by: Warren Tinca
automotive auto repair

Can a bad EGR valve cause a lean condition?

Last Updated: 23rd April, 2021

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Unwanted EGR flow at idle, even in very small amounts, causes a type of rough running that may easily be misidentified as a lean condition (somewhat more likely in MAP-based fuel systems). Importantly, however, EGR faults of this type do not generally clear up with propane.

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Subsequently, one may also ask, what problems does a bad EGR valve cause?

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.

Additionally, how can you tell if the EGR valve is bad? Symptoms of a bad EGR valve include:

  1. rough idling or stalling.
  2. a smell of fuel.
  3. increased fuel consumption.
  4. pinging, tapping, or knocking sounds.
  5. failed smog test.
  6. Check Engine Light on.

Similarly, can a bad EGR valve cause coolant loss?

Loss of Coolant - all that coolant evaporating inside the cooler and then blown out through the exhaust will ultimately cause your coolant levels to drop. Now, a loss of coolant isn't always indicative of EGR Cooler failure, but when accompanied by white smoke, it's a pretty safe bet.

Can EGR cause rich condition?

It can also burn holes in exhaust system components and destroy your vehicle's catalytic converter. EGR Valves allow burnt exhaust gases to reenter the intake manifold, causing a rich fuel condition by reducing the amount of oxygen.

Related Question Answers

Tlaitmas Zelarayan

Professional

Can you bypass EGR valve?

A common problem with EGR valves is that they clog up with soot and don't function properly. They are supposed to only be open in certain circumstances and are controlled by the engine management system. You can clean your valve with carb cleaner and refit it. Or, you can blank or bypass the valve completely.

Shamraiz Richard

Professional

Can you drive with bad EGR valve?

A stuck EGR valve can cause the engine to ping, and that will soon destroy it. Based on the performance issues you described, it sounds like the EGR valve pintle occationally sticks in the open position. EGR typically should only takes place at low load, highway speed driving conditions.

Messaouda Bassagoiti

Professional

Does removing EGR increase power?

Some of the most common reasons to remove an EGR valve are to increase horsepower, lower engine operating temperatures and improve fuel efficiency.

Dalmacia Mizner

Explainer

What code will a bad EGR valve throw?

OBD II code P0401 Exhaust EGR Flow Insufficient. The OBDII fault code P0401 means that the engine computer has detected that the Exhaust Gas Recirculation (EGR) system flow is insufficient. The EGR system redirects a small amount of exhaust gases back into the intake.

Sarjo Renaud

Pundit

What happens if EGR valve is blocked?

If the EGR valve is clogged or completely blocked off it can longer re-burn harmful emissions in the combustion chamber. The NOx emissions will flow unregulated through the combustion chamber and out of the exhaust pipe. The excessive NOx emissions will show up during a smog test and cause a failure.

Shery Lysakov

Pundit

What happens if you remove the EGR valve?

So what happens when you remove the EGR? Well, as per its job description, the exhaust gas temperature increases, putting unneccessary strain on the engine's cooling system and introducing a lot of unwanted heat into the turbo charger and catalysts.

Sylvain Mochanov

Pundit

Is there a fuse for EGR valve?

It doesn't have its own fuse and a simple electrical test would prove if it wasn't getting voltage anyhow. Also check with the garage if their diagnostic kit is fully compatible with Renaults.

Meire Lutzmann

Pundit

Henar Whiting

Pundit

How do you clean an EGR valve?

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

Edrisa Duman

Teacher

Should there be oil in the EGR valve?

Oil in the EGR is fairly normal and I see it all the time. Don't worry too much unless you get excessive blue smoke from the exhaust.

Anisia Deryuzhkov

Teacher

What EGR delete?

An EGR delete kit is an aftermarket performance part that removes the EGR valve and prevents exhaust from being redirected back to the engine. Ultimately, this allows your vehicle to function as if it never had an EGR valve. Soot deposited within the engine stresses the system and causes parts to wear down faster.

Lashandra Feldkircher

Teacher

Why is my EGR valve wet?

If it is wet, you either have coolant or oil in there. Neither is good. It should be dry as a bone and probably will have black soot all around it. If it is wet, you either have coolant or oil in there.

Crina Telinde

Supporter

Does EGR valve effect Turbo?

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

Tolentina Enderle

Beginner

Does blanking EGR damage engine?

Reason's An EGR Blanking Plate May Not Be The Best Solution. With proper maintenance, the EGR system not only runs fine, but your engine runs fine as well. The EGR is there to reduce emissions. Of the big three emissions from a petrol or diesel combustion engine, the EGR reduces the worst one: NOx.

Candelario Testu

Beginner

What causes o2 sensor High Voltage?

The high voltage condition from the O2 sensor is indicating a lack of oxygen in the exhaust or other related problems, such as a leaking fuel injector or a broken up catalyst inside.

Lisha Navya

Beginner

Can EGR valve be cleaned?

Yes, you can. Cleaning the EGR valve is easy. You do not need to drive your vehicle to a repair shop to have the device cleaned. All you need are a few hand tools, some elbow grease, and a good quality EGR system cleaner.

Khadouj Zero

Beginner

How does the EGR system work?

The EGR system reduces the combustion temperature by diverting a small portion of the exhaust gases back into the intake manifold. The EGR valve connects the exhaust manifold to the intake manifold. The EGR valve is normally closed. There is no EGR flow when the engine is cold, at idle, or during hard acceleration.

Mekki Izkisaroi

Beginner

How long do EGR valves last?

Average Life of EGR Valves
An EGR valve may last 100,000 miles if the part is designed well, or it may last only 30,000 miles. Occasionally a part is faulty and requires replacing, but this is often covered under warranty depending on the age of the vehicle.