scanner or code readers?

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Bill G. - 28 Nov 2008 06:14 GMT

Hi all,

My problem is when I stop, drive or back up the car surges (rpm normal about
800 surging 1600rpm. I would like some suggestions or what is a relatively
priced scanner or code reader. I have already changed the O2 sensor in the
exhaust pipe. I have a 1989 560SEL with 155,000 miles on the odometer.

TIA,

Bill

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Tiger - 28 Nov 2008 22:02 GMT

Scanner won't help in this car... not much... and too much money for one.

It is most likely to be the idle speed controller that needs to be replaced.
I did that on my 380SE. I would take out the ICV out and clean it out with
carburator cleaner.

Service manual for diagnostic on this is straightforward if you have the MB
original CD.

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Bill G. - 29 Nov 2008 04:08 GMT

Hey Tiger,

I have alldata to look up where parts are located, is the ICV on top of the
engine (by the firewall?. I also looked online for a new valve, AUTOHAUS
shows the price $150, is that right?

Bill

> Scanner won't help in this car... not much... and too much money for one.
>
[quoted text clipped - 4 lines]
> Service manual for diagnostic on this is straightforward if you have the
> MB original CD.

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Tiger - 29 Nov 2008 14:31 GMT

https://www.autohausaz.com/search/imageexpand.aspx?imageurl=../secure/PartImages
/0001411625.jpg

With engine running, if you unplug the wire, the idle speed will go up...
that is normal if it happens. However, it needs to be cleaned. from the two
pipe tube.

ICV unit is quite reliable and rarely needs to be changed.

The idle speed controller... however, will crap out due to age. Easily
determined to be good or bad by following the diagnostic procedure with a
multimeter.

https://www.autohausaz.com/search/imageexpand.aspx?imageurl=../secure/PartImages
/0065458532.jpg

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