Tech Tips: Why You Shouldn't Delete Your Diesel Engine EGR

You've probably heard the stories about how much trouble EGR valves are for your diesel engine. We hear you, but we also see the other side.  There may be more to the story, so take a look at what you likely won't find many articles about, but how to keep your diesel engine in compliance with the law and the specifications of your engine. 


Yes, we know the Exhaust Gas Recirculation (EGR) System is a pain, but...

It's true that their history has given them a bad reputation. We know it's frustrating to be facing expensive repairs because a part—which so many people consider unnecessary—fails. You want to avoid the additional downtime and service costs associated with EGR problems.

So, many drivers have turned to deleting the system from their engine.

This might solve one problem, but can create even more issues for your engine, especially if it's done poorly. Today, we're taking a look at why people have chosen to delete, and what problems that can cause.

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What Is an EGR Valve?

The EGR valve is responsible for recirculating the exhaust gas to the intake system to help increase engine efficiency and reduce NOx emissions.

Past Problems With EGRs

There's a lot of information circulating about EGR Systems and how unreliable they are. It's true that when they were first released, these systems would often leak and cause excessive soot and carbon buildup.

This caused major problems in the engine, which led to frequent and expensive repairs for operators. To avoid recurring problems and constant downtime, many operators chose to delete the EGR System from their engine.

Recent EGR Improvements

More recently, though, the technology has improved considerably, and the components are much more reliable. We have better EGR valves and better Variable Geometry Turbochargers than ever before.

But the reputation has stuck, and a lot of people still think that the way to keep their engine running the best is to delete their engines. They see it as never having to worry about replacing the EGR Cooler or Valve ever again.


What Can Deletes Do to Your Diesel Engine?

What some people don't realize is that while, yes, deleting the EGR system can help prevent some expensive repairs, it can also cause major problems in other parts of your engine.

Problems With Deleting Your EGR

First, deleting an engine takes you out of EPA compliance and is illegal. Doing so can lead to fines and other serious penalties.

You also run into the issue where your engine warranty is voided and some shops will no longer work on your engine.

Aside from that, though, you can actually cause serious damage to your diesel engine.

You Can Accidentally Damage Your Engine!

When the engine is built with the EGR System, the whole system is designed to work together. The EGR Valve and EGR Cooler cooler control the amount of oxygen that is brought into the engine, which controls the combustion temperature and keeps it in range.

When the system has been deleted, often these calibrations aren't properly taken into consideration—the compression ratios aren't changed, the temperatures aren't dropped, and the engine timing isn't altered.

Suddenly, you've created an environment where overheating and high pressure can create some serious problems.

Instead of replacing EGR valves and EGR coolers you're looking at much more expensive repairs—rebuilding engines and replacing cylinder heads.

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Engine Calibrations Are Key to Keeping Your Engine Running Right

So, what it really comes down to is if the engine is being deleted, are the rest of the systems being negatively affected?

Calibrations aren't something we deal with here at HHP because they're in violation of federal EPA laws.

But if someone still chooses to go ahead and delete, it's important that the calibrations are done correctly, cylinder pressures and temperatures are within operating range and timing is addressed.

Nowadays, there's so many calibrations on internet forums, that might seem to work, but will really cause even more problems for your engine long term. It's like getting a medication from the doctor who doesn't really know what the medicine is, but he trusts the person he got it from. You just don't really know what you're using.

More and more calibrations have become available for people because the engines have been out longer, but there's no guarantee that they're good calibrations.

There might be a calibration for big horsepower, but it doesn't develop that horsepower properly and you can end up with a more expensive repair. It causes high cylinder pressures and temperatures that result in cracked heads and VGT turbo damage.

It's like having high blood pressure—you don't know what's going on until it's too late.

Despite these issues, some people still choose to keep their engine deleted. If that's the case, it's important to go back to the basics of timing and compression ratios.

Temperatures all need to be within specification. It's a risky procedure that needs to be done correctly, or your engine will be at an even higher risk for failure than before.


How Highway and Heavy Parts Can Help With Your EGR Needs

At Highway & Heavy Parts, we're dedicated to helping you get the right parts for your diesel engine repair. We have a team of experts who can help you troubleshoot your problems and help find you the parts you need. If you're having trouble with your EGR system or VGT, we can help!

When it comes down to it, we know you want the highest quality parts at the best price. And you want them fast.

We only source our parts from the highest quality manufacturers to ensure you're getting parts that will last. We have a large inventory of parts to get you back up and running quick. The majority of our parts ship in two days or less!

Don't sacrifice quality! At HHP we're dedicated to bringing you the best quality replacement parts, backed by an industry-leading warranty.

From diagnosis through delivery, we're Highway & Heavy Parts.

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