Starter sticking on 2013 smart and whining sound from engine on cold starts
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Loud whine is the secondary air pump not the starter. Activates on cold starts.
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363 Posts
The loud while is your secondary air pump. For emissions.
What do you mean your starter sticks? Do you have a 451?
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Is it normal for this whining sound to be so loud that neighbours comment on how loud it is?...451?..not sure what that means but I mean when starter engages it stays on for a few seconds..before releasing itself..like a stuck solenoid..mechanic thinks it may be my computer sending bad message
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It would be hard to describe the exact loudness of the air pump. It's reasonable loud. I guess like a hair dryer.
451 refers to the generation of your smart. 450 was the first gen which we didn't get in the us but you can find some that were imported by some company. 451 is the most common one. I think they started being made in 2008 up until 2015.
They way the infinity works in the 451 is:
Insert the key, turn to position one, you have to wait about 5 seconds for the computer to boot, then turn the key to starter and release. The ECU will crank as necessary until the engine starts. Basically you don't have to hold the key in starter position. So does your starter continue cranking after the engine is already running?
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When the secondary air pump starts to go bad they "Can" emit a very loud noise. Yes that loud. If you have a cell phone it most likely has a voice recorder. Record the noise and post it on here or ask one of the mods for help if you don't know how. One of us may be able to help you more. A video would be better. Showing exactly what you are doing from turning the key to the noise following engine start.
Good luck
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The emission air pump runs for about 30 seconds while the heating elements on both 02 sensors are warming up to temp. To me the engine running for a minute on the rich side shouldn't be a big deal, but apparently Mercedes Benz thought it was a big deal. So they installed the air pump. If you open your tailgate and open the engine cover you can see the pump on your right almost over the fender well that is over the rear tire. I don't know if just unplugging the pump would throw an engine code or not. I haven't tried that. But my guess is it would. DCO
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The emission air pump had to be replaced on my 2015 Passion. $650 at Mercedes dealership. Someone else commented at the time that is what they were charged as well.
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