An exhaust gas recirculating or EGR valve is a crucial pollution-reducing component of a diesel engine. EGRs have gotten some bad press over the years, as they’re usually one of the first parts to fail. While some owners choose to bypass these systems instead of repairing them, the practice does more harm than good.
Heavy-duty diesel engine parts like those offered by pai industries are designed to work in unison, and a problem with the EGR system may spread into other areas. Here, we will discuss the most common symptoms of EGR valve failure and offer a few preventive tips.
Rough Idling
Changes in an idling engine’s RPMs should be met with concern. Several problems lead to rough and choppy idling, with stuck EGR valves being one of the most common causes.
Smoking
Unlike the coal-rollers of the past, today’s heavy-duty diesel engines produce little to no smoke. If your engine is smoking excessively, check for oil leaks and EGR valve failure.
Decreased Fuel Economy
If you’re an over-the-road driver, small increases in fuel consumption come at a high cost. When a diesel engine is using more fuel than it should, a failing exhaust gas recirculation valve may be to blame.
Diminished Performance
Does your equipment feel sluggish? Does it accelerate more slowly than it once did? Sometimes, a simple EGR valve swap is all that’s needed.
Warning Lights
Tractor trailers and heavy equipment have ECUs or engine control units that keep various systems in good working order. If your engine warning light comes on, the safest thing to do is to have it scanned for trouble codes before checking the EGR valve.
What Causes EGR Valve Failure?
EGR valves work under grueling conditions, and those not properly maintained are more likely to fail. Exhaust gas recirculating valves may stop working when:
- Stuck closed. A closed valve creates increases in nitrous oxide, which inhibits the combustion process and creates an engine knock that’s picked up by the ECU.
- Stuck open.When an EGR valve sticks open, too much exhaust gas gets into the intake and causes rough idling.
In either case, the engine control unit compensates by adding extra fuel to the combustion chamber, creating carbon buildup and increasing the risk of engine failure.
EGR Deletion: It’s a Bad Idea
Although EGR deletion may seem like a cost- and effort-saving measure, it’s crucial to go into the process well-informed. While today’s diesels can run without EGR valves, deletion isn’t a good idea.
Unauthorized diesel engine modifications are illegal and dangerous. Diesel engines are complex; the ECU handles all data, and any changes in the air/fuel ratio may cause it to add or take away fuel. Deleting the EGR valve may bring initial savings, but they come at a long-term cost.
Preventing EGR Problems
It’s easier to prevent EGR valve problems than to solve them. Keeping diesel engines in good condition is the best way to reduce the risk of issues, and cleaning the intake and EGR will help these vital systems last as long as possible.
Maintain the EGR and Stay on the Road
If your truck or tractor’s EGR valve shows signs of failure, prompt attention will keep a small problem from turning into a big one. By following these tips and maintaining your equipment, you’ll reduce the risk of EGR failure and lengthen its lifespan.
