Mercedes W126 3.8 5 4.2 5.6L in-depth tutorial of root cause of idle increase with temperature rise

Note: this Video was uploaded on November 13th, 2021 but didn’t go live until the afternoon of November 14 because it took YouTube 16 hours to upload and then several hours to process because of the length and Quality of being 4K.


In this video we will be covering the exact root cause of the phenomenon of increasing idle rpm when reaching operating temperature.
This video primarily covers the M 116 & 117 engines 3.8L, 4.2L, 5.0L and 5.6L but is also applicable to M 120 6.0L V12 engines and basically which operates by the suction principle ( Saugermotoren ).

We examine the relationship between timing chain and camshaft offset errors and how they produce additional vacuum with rise in engine temperature and the different options available to correct the issue with simple methods to a full engine rebuilt and how to determine when what repair method is good enough.

Further we are celebrating the 1 year anniversary of my purchase of my 560SEL with a mileage marker of 330,000 miles today

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