Mercedes 300SE-1991

The air injection pump has gone bad three times in a 2 years. I have used rebuilt. And what does the smog pump clutch magnet do?

I engages and disengages the air pump using electrical impulse signals from the computer.

Failure on these pumps is almost always the bearings. Is the belt tension at spec?


Thanks, Benzman,
I will check to see if the mechanic checked the belt tension.