What does an EGR bypass valve do?
EGR bypass valve – Located on the intake inlet. The ECM uses this valve to allow exhaust gas into the engine without going through the EGR cooler (EGR cooler bypass).
What happens if the gaskets on the EGR cooler fail?
If the EGR cooler gaskets fail, or the cooler gets damaged for any reason, it can cause an exhaust leak to develop. An exhaust leak may be heard as an audible hissing or tapping sound coming from the front of the vehicle. This will reduce the efficiency of the EGR system, and negatively affect engine performance. 3. Check Engine Light comes on
How to test the EGR cooler for coolant?
To quickly test the egr cooler, just remove the pipe that is on the outlet of the egr cooler and check for coolant. If coolant is found, the cooler will need to be removed and pressure tested to make sure it isnt internal engine. I don’t want to be the bearer of bad news but I’m willing to bet its the head gasket. There is a week spot on #5 and#6.
Why does my ISX engine keep eating coolant?
2009-2010 ISX’s are known for bad EGR coolers. But they quietly eat your coolant by letting it go out the exhaust and gradually gets worse over two month’s time. It doesn’t push it out the overflow. I think it’s the gasket design. When total EGR cooler failure happens your cylinders will fill with coolant and the engine will hydrolock.
Why is the EGR system in my car so hot?
The EGR system recirculates exhaust gases back into the engine in order to decrease cylinder temperatures and NOx emissions. The gas circulated by the EGR system can be considerably hot however, especially in vehicles equipped with diesel engines.
What happens when coolant enters the EGR system?
If the coolant is entering the EGR system, it can mix with this carbon. Small amounts of coolant can mix with this carbon, creating a sticky, tar-like buildup. In some cases, there may be enough coolant passing through to strip away the carbon. This leaves the valve looking like it has been steam cleaned.
What causes a cracked EGR cooler to overheat?
Exhaust gas pressure upstream of the turbo can be higher than coolant pressure, which means it’s possible for these gases to enter the coolant system through a cracked EGR cooler. This can push coolant out of the overflow bottle, which may lead to overheating.
2009-2010 ISX’s are known for bad EGR coolers. But they quietly eat your coolant by letting it go out the exhaust and gradually gets worse over two month’s time. It doesn’t push it out the overflow. I think it’s the gasket design. When total EGR cooler failure happens your cylinders will fill with coolant and the engine will hydrolock.
What causes coolant to blow out of expansion bottle?
Looks like gases enter the jacket under load, accumulate and then rush up to expansion bottled causing it to overflow – overflow pipe is tiny and most of coolant is blow out through the cap threads and sprays around under the bonnet.