A common problem has been flagged up by our technical team, relating to the variable intake manifold on the Mercedes-Benz W211. Potential complaints that are associated with this issue include:
■ Lack of power
■ Valves not working
■ Cam control mechanism broken
■ Malfunction indicator lamp lights up
Our engineers have determined that the cause of the damage is not the intake manifold itself. Instead it is down to a leaky line in the engine ventilation system.
The line in the engine ventilation system runs above the cam control mechanism on the intake manifold. This line can then start to leak with age or load. If oil leaks out and drips onto the cam control mechanism, its plastic material can become porous and break.
The solutions
1. If oil leaks out, the plastic line must be replaced with an aluminium line.
2. If the cam control mechanism is already damaged, the intake manifold should then be replaced.
PART PROFILE
Part: Variable intake manifold
Pierburg no: 7.00246.33.0
Manufacturer: Mercedes-Benz
Vehicle applications: C, CLC, CLK, CLS, E, ML, R, S, SL, SLK, Sprinter,Viano
Reference no: A 272 140 21 01, A 272 140 22 01, A 272 140 24 01
Replacement for: 7.00246.26.0… .29.0
Engine compartment W211 with engine ventilation system line (highlighted).
Cause of damage: oil leaking from line of engine ventilation system (highlighted) and damaging cam control mechanism.
YOU CAN FIND MORE PRODUCT AND SERVICING TIPS BY LOGGING ON TO WWW.MS-MOTOR-SERVICE.COM
