A common failure inherent to the intake manifold of Mercedes-Benz M272 V6 & M273 V8 engines is for breakage of the actuating mechanisms on the intake swirl flap system. These flaps are designed to create intake flow turbulence improving low speed engine performance, enhancing fuel economy, and reducing emissions. A failure in this system will be detrimental to engine performance including symptoms such as, poor idle, loss of power, check engine light with the code P2004, P2005, or P2006, amongst others, and failed emissions testing. In addition, if not repaired quickly it could result in damage to other costly emission control system components.
The central pivot lever is operated by a computer controlled vacuum actuator, which in turn operates the swirl flaps. As the intake manifold experiences carbon buildup, the flaps on the inside have to work harder and harder to open and close. This, in addition to being exposed to high under-hood temperatures, makes the plastic brittle and causes the weakest points of the system to fail.
Extensive testing and analysis by the URO Parts team, has determined the most prevalent failures in this system are breakage of the plastic central pivot actuating lever and failure of the plastic vacuum actuator due to either breakage of the plastic pull rod that operates the central pivot lever or from a rupturing of the internal operating diaphragm.
The plastic material used in the construction of the intake manifold is the main source of the problem. Over time this less robust plastic material cannot withstand the constant heat cycles and mechanical stresses, therefore embrittling and weakening the material leading to inevitable failure. The URO Premium intake manifold repair kit is the only solution which solves all of these issues during your first and only repair.
At URO we wanted to make a replacement part that could withstand the heat, operate effortlessly, and be as light as possible. We turned to high-strength aluminum. The URO Premium kit provides a more robust swirl flap pivot lever featuring a permanent co-molded self lubricating Delrin center pivot bushing and left and right receiver cups for the swirl actuating levers. The new URO Premium actuator has been redesigned with a metal pull rod to withstand the engine heat, plus its stroke has been altered to eliminate the mechanical stresses of constantly bottoming out on the manifold stops. In addition, it is fitted with a long life high-temperature silicone diaphragm for added strength. Included in the kit is also a new pivot bolt made out of stainless steel to replace the original one should any damage occur from removal. The URO Premium intake manifold repair kit is not just a suitable replacement for when the part fails, but rather a redesigned part that fits flawlessly with the Mercedes-Benz image of excellence in engineering.