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Originally Posted by MercyBenz63
Hello all,
Vehicle: 1992 300E 3.0L AT 122k
Problem: Last night while tooling around town a loud, rpm dependent whirring noise developed. It is present in all gears including park and neutral.
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From your description of the noise it sounds like a plugged filter. Did you personaly see the filter being changed, if the answer is no, change the filter. The pump turns when the engine is turning.