Excessive 'Fan' Noise in 540I-6

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dguilbeau

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#1
Last night I started to hear what I can only describe as excessive 'fan' noise from the engine. It sounds like the radiator fan is running at speeds higher than normal. Most notable in low gears, but I can hear it at all speeds. When I rev above 2K RPM it sounds terrible; like the fan is running twice as fast as it should. I also feel a lost of power.

I'm wondering if this could be a sign that the Catalytic converter is going. Any one experience this before? I don't have any check engine lights coming on or anything.

It carried over today except for 1 trip at lunch time. Then the noise returned tonight.
 
Chesty Bonds

Chesty Bonds

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I don't really see the connection between lots of fan noise and a dodgy cat-converter. Are you sure the big fan noise is not just when you first get going, after which it cuts out? My dad's 740iL (with the M62 like yours) makes a huge amount of fan noise for about 1 minute after which it dies down. I think the aux fan cuts in automatically when the car starts and then cuts out again after a short time. Are you sure it's not just this?

If it's going all the time then I'm not sure what the problem is.
 
jrt67ss350

jrt67ss350

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wood_e said:
well if it has one, I'd check it. Maybe the clutch has failed in an always on position. That way it increases with engine speed, and is a drag on the engine.
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True, but that would be a strange failure. When fan clutches fail, they almost ALWAYS fail such that they slip excessively and the fan runs too slow.
 
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epj3

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jrt67ss350 said:
True, but that would be a strange failure. When fan clutches fail, they almost ALWAYS fail such that they slip excessively and the fan runs too slow.
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Not necessarily. Most aftermarket (Behr) fans that fail stay on. Mine did it, my friend's on his e36 did it, and my friend's Miata had a Behr, and that did the same thing Plus I've heard of it on numerous forums. My e30's Sachs (or whoever makes the oem one) failed and just 'slipped'
 
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