Why does an EGR valve need to be replaced?
EGR valves are a part known for failing often and it can result in an expensive replacement cost. The EGR valves have to withstand a lot of wear and tear because of the hot air and the amount of carbon that gets built up inside them.
Why does my engine IDL when the EGR valve is open?
The engine will experience rough idling when there is a malfunctioning EGR valve because the valve will get stuck in a closed or open position. This means that too much or too little exhaust gas will be entering the chamber, which will cause the engine to not run smoothly.
Why does a bad EGR valve smell bad?
Since the engine will be consuming more fuel, more hydrocarbons are going to exit the tailpipe. This will intensify the fuel odor to the point where passengers can smell it inside the cabin of the vehicle. You obviously won’t want to keep on smelling this because it is not healthy.
How is exhaust gas circulated in an EGR system?
Most EGR systems have a by-pass valve integrated with the EGR cooler. When the engine is cold, the exhaust gas is circulated directly into the engine.
Why is an EGR cooler needed In an oxidation catalyst?
The EGR cooler has a very high heat exchange efficiency and, without by-pass, the recirculated gases would be very cold and delay the warm-up of the oxidation catalyst, which would lead to excessive emissions of HC and CO. The solution is therefore to bypass the EGR cooler until the oxidation catalyst reaches nominal working temperature.
Why does my check engine light come on when my EGR valve is stuck?
Whether the EGR valve is clogged, stuck open, or stuck closed, you’re going to get a check engine light. While the check engine light will usually point you straight to the EGR valve, it is possible that it might come on due to a symptom instead of a cause.
Where is the EGR valve on a Volvo?
If you have EGR and you serviced the PCV then you would have had to deal with getting the valve off of the bottom of the intake manifold just behind the throttle body. It sounds like you don’t have EGR. 1999 V70XC – Nautic Blue – Totaled while parked.
Which is the only Volvo with EGR cleaning?
’07 S40 T5 AWD 6 speed manual! Silver/Black Stage1 Heico & Elevate My son’s ’96 is the only Volvo we have with EGR and we fixed it when we serviced the PCV. As you found out, the carbon clog in the hole above the valve is like concrete.
Can a faulty EGR valve cause VNT to stick?
A faulty EGR valve can result in excessive carbon/soot at the turbine end, causing the VNT mechanism to stick. It is important to check the EGR valve is functioning correctly.