Airmatic pump just runs and electrical burning smell
Thread Starter
Member
Joined: Oct 2007
Posts: 146
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06 E500 sport
Airmatic pump just runs and electrical burning smell
I was sitting in traffic last night and my check engine light came on.
My initial thought was to keep driving home and take it to the dealer in the morning.
Fear got the best of me and I turned around and took it in, leaving it running in the service line. I wanted to make sure the SA saw the light.
After turning it off, this buzzing sound was coming from under the hood. I was smelling a faint electrical burning. A tech walked up and opened the hood, pulled off the front engine cover and unplugged the pump. It was obvious to me at that time that the pump was the electrical smell.
It would seem that either the ECU screwed up and told the pump to run continuously, or there's a leak in the air suspension, or most likely a faulty relay.
Any ideas?
The reason for the post is....should they replace the air pump in addition to whatever control was causing the problem? and...
Has anyone else had this happen?
(06 E500 completely stock, 18k miles)
My initial thought was to keep driving home and take it to the dealer in the morning.
Fear got the best of me and I turned around and took it in, leaving it running in the service line. I wanted to make sure the SA saw the light.
After turning it off, this buzzing sound was coming from under the hood. I was smelling a faint electrical burning. A tech walked up and opened the hood, pulled off the front engine cover and unplugged the pump. It was obvious to me at that time that the pump was the electrical smell.
It would seem that either the ECU screwed up and told the pump to run continuously, or there's a leak in the air suspension, or most likely a faulty relay.
Any ideas?
The reason for the post is....should they replace the air pump in addition to whatever control was causing the problem? and...
Has anyone else had this happen?
(06 E500 completely stock, 18k miles)
MBWorld Fanatic!
Joined: Dec 2006
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Likes: 335
From: Europe
223.168 & 213.012 & 906.633 & 214.005
Odd if the check engine light got on if it was an Airmatic related issue.
You don't mention any "car too low" message on the cluster or any corner being low? It should not be a leak at the struts or the valves controlling each strut then.
I guess you will tell what the issue was.
You don't mention any "car too low" message on the cluster or any corner being low? It should not be a leak at the struts or the valves controlling each strut then.
I guess you will tell what the issue was.
Thread Starter
Member
Joined: Oct 2007
Posts: 146
Likes: 0
06 E500 sport
Update:
It turns out that that pump on top of the engine is the air injection pump for emissions. It was running constantly. The airmatic pump is in a different location, apparently.
They're changing the pump out now.
I'll update this post when I get the car back.
It turns out that that pump on top of the engine is the air injection pump for emissions. It was running constantly. The airmatic pump is in a different location, apparently.
They're changing the pump out now.
I'll update this post when I get the car back.
MBWorld Fanatic!
Joined: Dec 2006
Posts: 6,499
Likes: 335
From: Europe
223.168 & 213.012 & 906.633 & 214.005
Oh, I should have followed your description about the location better. The Airmatic pump is at the front left of the engine bay but more hidden behind the bumper at the bottom.
