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Old 02-09-2019, 10:14 AM   #1
Brotkasten
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Default Bosch 2x2 Coil measures dead short

Wanted to make this problem searchable with this thread. Maybe its not a problem at all... I dont just want to order a new coil...

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Originally Posted by Brotkasten View Post
I did some more testing today (I ordered Butchka's board and replaced BTI's - LC reasons..) and noticed:

- The car still will start and run really choppy
- Revving up just kills it
- Tacho works fine now.

I started to probe again and then I finally found something: ALL pins on the Bosch 2x2 module are shorted out - 0 Ohms (tested directly at the module). That would mean all cylinders are firing at the same time, right?
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Old 02-09-2019, 02:04 PM   #2
dl242gt
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Can you be a bit more specific? Are the pins shorted to ground? Are the pins shorted to each other? Don't forget the primary ciruit of a coil is very low resistance. Your meter may not be sensitive enough to accurately measure it. Coils do go bad and sometimes component substitution proves out the problem.
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Old 02-09-2019, 02:19 PM   #3
bobxyz
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I looked at the datasheet for the Bosch Double Fire Coil 2x2 0 221 503 407, and the primary resistance is a tiny 500 mOhms (0.5 ohms). Hold your probe tips together to get the baseline reading from your meter. If you measure at the connector, from center pin to either side pin, you should see a slightly higher reading, or measure across the 2 outer pins and it should be 1.0 ohms higher. The secondary resistance (plug tower to plug tower) is 13.3K ohms.
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