Benz Forum banner

1 - 3 of 3 Posts

·
Registered
Joined
·
13 Posts
If it's anything like the 300E (I know, two more cylinders), it's a smog pump. It only runs on cold startups and helps warm up the oxygen sensor quicker to get the fuel injection ECU into closed loop mode sooner. Then it cuts out and just idles until the next time it's needed.
 
1 - 3 of 3 Posts
Top