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Old 09-14-2017, 12:48 PM
lsmalley's Avatar
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Join Date: Oct 2006
Location: California
Posts: 2,153
Angry M103 rough idle...yet again.

The only thing I hate about the m103 is that it seems to always develop a rough idle. I have no vacuum leaks, 2 new fuel pumps and fuel filter, spark plugs done yesterday with Bosch H9DC non-resistor plugs, K&N filter is good, even if I have the air cleaner housing off at idle it's still rough. Less than 40k miles on O2 sensor.
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1990 190E 3.0L
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