06/17/2026
A diesel Mercedes came in with EGR and airflow-related issues.
Using an inspection camera, we found heavy carbon buildup inside the intake manifold, EGR piping, and related components. While some carbon accumulation is normal on diesel engines, excessive buildup can restrict airflow, reduce performance, and trigger fault codes.
In this case, the deposits were significant enough that the intake system required extensive cleaning. We also found additional components that were better replaced while everything was apart to help prevent future issues.
This is a good reminder that not every engine problem is caused by a failed part. Sometimes the real issue is years of carbon buildup slowly restricting the system.
If your diesel vehicle feels sluggish, has reduced power, or keeps returning airflow and EGR codes, it may be time for a closer inspection.
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With best regards from the HI-TECH Automotive Team.