What Causes an EGR Valve to Fail: 7 Reasons Why Exhaust Gas Recirculation Valve Go Bad скачать в хорошем качестве

What Causes an EGR Valve to Fail: 7 Reasons Why Exhaust Gas Recirculation Valve Go Bad

Topic: Why EGR Valves Go Bad. Hey everyone, Brian with the Honest Mechanic here to talk about why those EGR valves keep failing. The EGR or exhaust gas recirculation system takes some exhaust and reintroduces it into the intake to lower combustion temperatures. But these valves get gummed up over time and can cause major performance issues. Let’s do a deeper dive on each specific failure mode and what symptoms they typically create: Carbon Buildup: Carbon accumulates from oil residue and unburnt fuel left behind in the exhaust gases flowing through the EGR components. The carbon sticks like plaque on areas like the valve stem, seat, inlet/outlet tubes and mixer chambers. Buildup speeds up with lots of short, cold starts. Just a small amount can restrict full valve movement and throttle flow. Symptoms include rough idle, loss of power, reduced MPG, stalling and trouble codes for insufficient exhaust flow. The roughness gets worse as carbon accumulation grows. Thermal Stress: The temperature extremes are brutal on EGR valve materials leading to warped parts, leaks and cracks. We’re talking thermal cycles exceeding 500+ degrees F whenever on/off. This leads to broken piston diaphragms, damaged valve stems, leaky gaskets and separated electronic solders. Drivers then notice symptoms like check engine lights, rough running, and loss of engine power from unexpected intake leaks or exhaust access. Component Wear: The constant vibration, pulsing pressures and exhaust contaminants take a toll on valve components not designed to operate forever without service. Spring fatigue, eroded diaphragm edges, worn valve seats and aging wire harnesses are common. Performance gradually declines and symptoms may resemble sensor failures as valve response times lag. Stress-related cracks also create erratic functionality leading to symptoms that seem to resolve temporarily. Electrical Issues: Many modern EGR valves incorporate electronic position sensors, solenoids and motor actuators enabling precise exhaust flow control. But connectors, pins and wires corrode over time from moisture ingress or heat damage. Power surges can also overload delicate electronics. Any connectivity loss or signal degradation to the ECU causes emission control issues. Drivers notice EGR codes, stalling, rough running and poor throttle response. Contaminant Damage: The EGR system sees plenty of hydrocarbon fouling and chemical ingestion from road debris and byproducts of incomplete combustion accumulating internally. Items like soot, fuel residues and sulfurous oil vapors chemically react with valve components. They breakdown protective coatings leading to accelerated wear through pitting, gumming, adhesion loss and hardness changes. Silicates in inadvertent dust/dirt also physically damage moving parts through abrasion. Symptoms again resemble gradual efficiency losses and eventual flow failure. Hopefully that gives some detailed insight into each of the most common EGR valve failure modes and the types of drivability symptoms they produce. Let me know if you have any other questions! #egrvalve #Exhaustgasrecirculation