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#1
07-25-2014, 02:44 PM
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What is it
I have a 96 e320 with the 3.2 inline 6 cylinder engine, what is the unit on the front of the engine under the alternator and what does it do?
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#2
07-25-2014, 03:58 PM
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That would be the smog pump if I am not mistaken.
Its job is to engage at initial start and pump air into the exhaust to thin out the pollution in the exhaust until the motor is running well.
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#4
07-26-2014, 10:57 AM
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It tends to whine for a minute or two when the car is started cold, is this normal or is there some service it requires such as a cleaning?
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#5
07-26-2014, 01:27 PM
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Normal. Sometimes it will turn on again after driving a bit to test the OBD 2 system.
Sounds like a quiet vacuum cleaner. There is a screen on the bottom / back , just have a loot to see if it is grease covered. There is a valve between the two exhaust manifolds, this is operated by a vacuum solenoid at the front of engine ( under the black plastic cover ) . Make sure you are getting vacuum at the manifold valve when the pump is running.
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