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'91 190E 2.6 5-spd
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Discussion Starter #1
When I first start up the engine it sounds normal, but as the RPM's build I have a whistling sound with increases in intensity with the RPM. After a minute or two, when the engine warms up a little it abruptly stops.

I assuming that it's all related to the cold start system, but what exactly is it from? Is it normal?
 
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