AIR INJECTION/SMOG PUMP

1991- Present : 300SE, S320, 400SE, 400SEL, S420, 500SEL, S500, 600SEL, S600, 500SEC, S500, 600SEC, S600
S320 CDI, S320, S430, S500, S600, S55 AMG, S63AMG, S65AMG
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pina4greg
E Class
Posts: 53
Joined: Tue 09 May, 2017 11:53 pm
Model you own: w140
Region: Western Australia
Location: Eglinton

AIR INJECTION/SMOG PUMP

Post by pina4greg » Wed 26 Sep, 2018 5:57 pm

I have a noise coming from the drivers side front of the engine in my 1992 300se. I have been advised its probably the Air Injection/smog pump. I took the steps and removed the serpentine belt to check the pulleys and all seems ok there....no sideways movement....no grinding when spinning by hand.

I was tempted to removed the pump altogether but just disconnected the electrical connection to the clutch. when I put all things back the noise is still there...goes for about 20 seconds then off....once warm nothing....don't believe its the belt...

a new pump is quite expensive...$1200 original or new......400 or so remanufactured in the USA...they want a core exchange for about $260...

Any ideas????

Cheers and safe driving

Greg
1992 W140 300se

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