The most common cause of the Mercedes Benz intake manifold problem is one of the actuators for the variable system, causing the interior flap to become disconnected. Many of these intakes also have specifically shaped flaps that cause a vortex, adding even more efficiency. Then if you get on the throttle and request power for sportier or more demanding driving, the flap switches over to the second set of intake runners that is optimized for the higher rpm range. This way, you can have one set of intake runners optimized for when the car is idling, and picking up low RPM speed. For a road car, this is around 3-4,000 rpm, where long intake runners promote a smooth even vortex.Ī variable-leng th intake runner manifold can switch between two sets of intake runners with a flap built into the manifold. Unfortunately, scavenging only works in a narrow RPM range, so most engine designers build the intake runners to achieve this in a very useable RPM range. To work in the RPM range you are targeting, you can tune the intake runners to be a very precise length. The trick is to have the pressure wave arrive back at the cylinder right as the valve opens, achieving the densest possible air mixture passing into the combustion chamber (picture a high-pressure standing wave right behind the open intake valve). The pressure wave will ricochet back up into the intake manifold until it hits the back, where it will bounce back down the runner. As the intake valve closes, the air going into the engine hits the back of the valve and ‘bounces’ back. ![]() The intake runner is the tube going into the cylinder head that the intake air travels down to get to the cylinder. To review the system, let’s describe what the Mercedes intake system is doing and why variable-intake-runner intake manifolds are becoming such popular design in modern cars. The Mercedes Benz intake manifold problem is caused by one of the inlet manifold tuning flaps breaking, causing unexpected and deficient performance depending on the orientation of the flap that has broken. Generally, we find problems in performance, which include poor idle, loss of power, and a Check Engine Light. Many owners of late-model Mercedes-Benz cars equipped with 3.0 and 3.5l V6 engines (M272 or M273), as well as some of the later V8s, have or will likely soon experience a near-universal Mercedes Benz intake manifold problem.
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