Compression Ignition Addict
Join Date: Oct 2007
Location: Galveston Bay
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The cooler for the EGR could rupture and leak coolant into the intake.
The EGR re-circulates burnt exhaust gas into the intake to reduce NOX emission. Returning hot exhaust gas into the intake is not so good for performance. So, air is routed over a small cooler before being re-introduced into the intake. The constant exposure to hot exhaust gasses, and silica in the cooling system causes the cooler to fail.
In THEORY the egr system should reduce temperature inside the combustion chamber. ( By lowering the amount of available oxygen ) However in the real world it does not. The cooler is inadequate. If you live in a state without diesel emission testing, you can buy a kit and remove the entire EGR and EGR cooling system.
Deleting this system will also keep the intake cleaner as you are no longer pushing all of the soot from your exhaust back into the intake.
If the cooler begins to leak, it will more often than not flash off the leaking coolant, and over pressurize the coolant degas bottle. If it leaks too much coolant, water will not compress, and will find it's way out of the combustion chamber at it's weakest point, head gaskets, heads, or head bolts.
I got taken out by a Hyundai...it's not funny...now I look like Stump, but taller