ML320 Tapping Sound

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wx4usa - 10 Mar 2007 01:23 GMT

I have a 1999 ML320. There is a tapping sound coming from something
mounted on the drivers side firewall, not the engine itself. It is
consistent about 2 taps per second....

What is it? It appears to be something mounted to the drivers side
firewall up high, about 12-15 inches in from the side of the
compartment.

Thanks

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Wan-ning Tan - 12 Mar 2007 04:51 GMT

How old is the car battery? If it is the original, replace it now.

I am not familiar with W163 cars. I had similar sound (though slower,
about 1 tap every 2-3 seconds) on my 96 C280 (W202) from around the
motor driven throttle valve (I suspected) many years ago. I never
figured out what it was but the sound disappeared after battery was
changed. It may be just a coincident but worth checking.

> I have a 1999 ML320. There is a tapping sound coming from something
> mounted on the drivers side firewall, not the engine itself. It is
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>
> Thanks

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wx4usa - 14 Mar 2007 03:32 GMT

> How old is the car battery? If it is the original, replace it now.
>
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>
> > Thanks

The throttle is atatched to whatever is making the noise, so Ill check
the battery next. Thank you for your input! Hal

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