29/04/2023
Lets talk about DPF's and EGR's.
After having conversations with customers. Its become apparent that some people could do with a little explanation on exactly what they do and how they work. Also why they fail.
So, lets start with the DPF (diesel particulate filter).
A DPF is a part of the exhaust that is bolted as closely behind the engine or turbo as possible (for heat reasons, but we will get back to that). Its main job is collect soot that would otherwise be sent into the atmosphere.
Once the soot is collected. It then relies on the heat mentioned before to burn it as efficiently as possible, making it clean enough to pass through the filter and cleaner for the environment. The issue comes when vehicles do small journeys, never getting to temperature to clear the filter, causing blockages and ultimately engine failure.
EGR's (exhaust gas recirculator) are a valve situated between the engine and exhaust. Its main function is to open when needed and recirculate the sooty exhaust gasses back into the engine. The idea is that burning it a second time in the engine will make it cleaner.
This has a few complications.
1, is that reused exhaust gasses aren't as efficient for your engine, losing it power.
2, these sooty deposits build in engine components (see picture). causing them to block and fail.
Looking at the picture of an opened EGR valve, you can see lumps of soot (carbon build up), these lumps will end up back in the engine, which isn't good for the pistons moving at thousands of strokes per minute. This can cause premature wear of an otherwise health engine.
The car in the picture was frequently driven between Bristol and London, and was still this built up with soot!
Hopefully from this explanation, you can see what these components are supposed to do and why they are legally supposed to be on the car. But, can also be the first components to fail.
If you are getting lights on the dash like in the photo, a rough running engine or even a car in limp mode. Contact us for solutions.
(we do not recommend removing either, for legal reasons)