paulkno
New Member
- Joined
- Apr 3, 2017
- Messages
- 7
- Reaction score
- 4
- Location
- Manchester
- Your Mercedes
- S-Class W220 2002 320CDI
The EGR valve is vacuum operated. With the vacuum transducer disconnected is the valve opened or closed?
I recently removed and cleaned the inlet manifold and I do not wish to repeat this so I'm looking into disabling the EGR. I purchased a wiring kit to disable it electronically by tapping into the the MAF and transducer wiring and disconnecting the transducer fooling the ECU into thinking the EGR is still functioning.
However... If I disconnect the vacuum I have EGR jammed open symptoms and the engine is audibly slightly louder like the valve is open allowing exhaust gases into the inlet. With the vacuum connected the engine is quiet and full power is restored. Leading me to believe that the vacuum operated actuator is closing the valve. So disconnecting the transducer and fooling the ECU into thinking the transducer is still connected is redundant as the EGR valve will be constantly open.
The only instructions available for this show a W210 CDI which has a slightly different EGR arrangement to the W220. Has anyone successfully bypassed the EGR on an S-class and have a clue what I'm talking about?
I recently removed and cleaned the inlet manifold and I do not wish to repeat this so I'm looking into disabling the EGR. I purchased a wiring kit to disable it electronically by tapping into the the MAF and transducer wiring and disconnecting the transducer fooling the ECU into thinking the EGR is still functioning.
However... If I disconnect the vacuum I have EGR jammed open symptoms and the engine is audibly slightly louder like the valve is open allowing exhaust gases into the inlet. With the vacuum connected the engine is quiet and full power is restored. Leading me to believe that the vacuum operated actuator is closing the valve. So disconnecting the transducer and fooling the ECU into thinking the transducer is still connected is redundant as the EGR valve will be constantly open.
The only instructions available for this show a W210 CDI which has a slightly different EGR arrangement to the W220. Has anyone successfully bypassed the EGR on an S-class and have a clue what I'm talking about?