Purge Valve?
Thread Starter
Member
Joined: May 2005
Posts: 151
Likes: 3
From: Atlanta, Ga
'16 E350 ‘07 S550 ‘21 GLE580
Purge Valve?
In the attached picture, is the device circled in yellow with MOT on the top the purge valve or "regeneration switchover valve" as the service cd calls it? On my '00 E320 you can here this device ticking and can feel it pulsating very easily. On the '94 I have never heard it or been able to feel it working. If it is what i think it is I know it deals with fuel vapor. What issues might I have if it doesn't work?
Thanks
Thanks
Thread Starter
Member
Joined: May 2005
Posts: 151
Likes: 3
From: Atlanta, Ga
'16 E350 ‘07 S550 ‘21 GLE580
Thread Starter
Member
Joined: May 2005
Posts: 151
Likes: 3
From: Atlanta, Ga
'16 E350 ‘07 S550 ‘21 GLE580
I took it out and cleaned it with WD-40 as suggested by Arthur Dalton on mercedesshop. I also hooked to to 12+ volts while it was out and it did work but with not much force. Once it was back in I stated the engine and waited until all the required conditions were met for it to activate, it never did. I then put a LED on the pins and confirmed the ECM is commanding the purge valve. I checked the codes and got nothing. Then I pulled the suction line to the valve and the valve stating pulsing, again not with much force. I am theorizing that the vacuum from the engine is to much for this weak valve to overcome and it cannot open. Although the valve technically works it is to weak to preform its function in the evap system.
I'm going to replace it.
I'm going to replace it.
Newbie
Joined: May 2021
Posts: 10
Likes: 0
1991 w124 300e
I took it out and cleaned it with WD-40 as suggested by Arthur Dalton on mercedesshop. I also hooked to to 12+ volts while it was out and it did work but with not much force. Once it was back in I stated the engine and waited until all the required conditions were met for it to activate, it never did. I then put a LED on the pins and confirmed the ECM is commanding the purge valve. I checked the codes and got nothing. Then I pulled the suction line to the valve and the valve stating pulsing, again not with much force. I am theorizing that the vacuum from the engine is to much for this weak valve to overcome and it cannot open. Although the valve technically works it is to weak to preform its function in the evap system.
I'm going to replace it.
I'm going to replace it.
