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Old 03-11-2017, 12:43 PM
Frank Reiner Frank Reiner is offline
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Join Date: Feb 2011
Location: Modesto CA
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Quote:
Originally Posted by mbenz280ce View Post
Also are these ignition modules sensitive to changes if so then I'll leave it alone. I'm not looking to make any major changes just increase the spark a little with a coil and plugs but if it can fry the module then I'll leave it be.
They are indeed sensitive to changes, and one of those changes is the coil. The coil and the driver circuit in the ICU operate together to provide an oscillating decay of the primary magnetic field in the coil during the length of the arc. A change in the characteristics of the coil may not always have detrimental consequences for the ICU, however, it has happened. If your ICU matches the one shown in the link provided by fonzi (below), it is a TSZ 8u. If it has a smooth, stamped cover it is a TSZ 4. Both are sensitive.

Quote:
Originally Posted by fonzi View Post
I just noticed this. A friend of mine has some older ICUs but none like this despite having a few m110 cars.
WTB: Ignition control module - Mercedes-Benz Forum
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