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 19 November 2013 View it on your browser Unsubscribe



Mercedes Benz uses a 2 stage dual length variable intake manifold to optimize engine flexibility. At engine speeds between 1750-3900rpm the variable intake flaps are closed to utilize the longer runner for improved torque and drivability. At engine speeds above 3900rpm the variable intake flap opens to utilize the short runner for top end power.

These manifolds use swirl flaps to improve air fuel mixture at engine speeds below 3000rpm under certain operating conditions.


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Fault / Symptoms

  • Increased fuel consumption
  • Loss of low speed torque
  • Various DTCs relating to variable intake and swirl flap systemsTest Procedure


  • Sticking or seized variable intake flaps.
  • Sticking or seized swirl flaps.
  • Broken swirl flap switchover linkages, located at the front of the intake manifold (common).
  • Vacuum leaks from vacuum  diaphragms and vacuum hoses.
  • Faulty variable intake and swirl flap switchover solenoids.

For information on tests to conduct and the remedy click here and download the complete tech tip.

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OE Variable Intake Manifold - Mercedes VIM1000 

OE Variable Intake Manifold - Mercedes


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