What happens when the EGR valve goes bad?
The EGR valve is an electronically controlled valve that controls the flow of exhaust gas into the intake manifold. The EGR valve fails due to carbon build up on the valve or it can fail electronically. When it goes bad, it can cause black smoke, loss of power, no start and a fluttering noise.
Why does the fuel management light stay on when the EGR is open?
This means the amount of hydrocarbon gases emitted from the tailpipe increases significantly producing a fuel smell. Your engine management light may stay on once your car detects an issue with the EGR valve. This could be caused when the EGR is either constantly closed or open.
How does the EGR system cool the engine?
Short version: The EGR system is water cooled – it’s capturing hot, highly energetic exhaust gas from between the manifold, and sending it back to the inlet side of the engine, and that heat is a gross disadvantage to engine operation.
Why does my engine make a knocking noise when the EGR is closed?
Knocking noises from the engine can be caused if the EGR is constantly closed. This is because at low rpm the fuel ignites early when it meets the high temperature. Detonations are also common as a second ignition can occur after the normal ignition.
How does a bad EGR valve cause an engine to overheat?
In fact, it is one of the first symptoms of a faulty EGR. Because the EGR will restrict the flow of gas through the cooler, the engine will experience a large amount of heat which leads to overheating. The restriction of heat through the cooler is caused by carbon built up in it.
What are the symptoms of a bad or failing EGR cooler?
Check Engine Light comes on Another symptom of a bad or failing EGR cooler is a Check Engine Light. If the computer detects a problem with the EGR system, such as insufficient flow or exhaust, it will set off the Check Engine Light to alert the driver of the issue.
What to do if your EGR valve is leaking?
Answer: The EGR valve gasket is probably leaking, allowing exhaust fumes to escape. Remove the valve, clean buildup around the valve and passages, if any, and replace the gasket. Remove the valve, clean buildup around the valve and passages, if any, and replace the gasket.
What happens when a sticky EGR valve is opened?
If the valve is not completely stuck open but never achieves a tight seal when it closes, the engine can “miss” or shudder because of the improper mixture of the combustion elements. Sticky EGR valves that open too much or too soon will cause the vehicle to stumble or hesitate when accelerating.