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E36 325i jet engine whining sound, intermittent
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<blockquote data-quote="LCP" data-source="post: 8018" data-attributes="member: 2424"><p>Was driving back from a biz trip in Ipoh to Penang last evening, more than 70% of the way was raining. About maybe 10-20km from Juru toll, I noticed this funny and loud whining sound that come and goes, all the while I was keeping the speed and rpm steady at about 110km/h and 3000rpm... did not feel any difference to engine performance, can still accelerate and decelerate normally, no warning lights. The sound is a bit like a jet engine, also a bit like a supercharger whine (last I checked there wasn't any supercharger under the hood <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> ). Sounded like from the front. It came and went away, a few times over a few minutes, very similar to the performance/rhythm of the fan clutch as the coolant temperature rise and fall, maybe more like the coolant flow stopping and starting as regulated by the thermostat. And after coming and going for a few times, it went away completely, but by then the traffic had slowed to about 90km/h. Then the traffic went into a stop-start jam because of roadworks, none of the sound came back, all the way through Juru toll, Penang bridge and into George Town, till today. All the while there was no difference in coolant temperature reading either, rock steady in the middle as usual. So, what gives? Anyone experienced this before? Is it a sign of the viscous coupling fan clutch about to go up to the big fan clutch in the sky? Or is it something more serious like my Vanos going kaboom? Or maybe some dead rat getting shredded? Or any chance that the ballz of the car (rear diff lah) about to be fried soon (although I still think that the sound came from front)? Anyway, upon reaching home, I opened up the bonnet to check, with car engine idling, no funny stains visible, no funny sounds either. An no dead rat too. The fan still has the characteristic whoosh sound when revved above 2000rpm.</p></blockquote><p></p>
[QUOTE="LCP, post: 8018, member: 2424"] Was driving back from a biz trip in Ipoh to Penang last evening, more than 70% of the way was raining. About maybe 10-20km from Juru toll, I noticed this funny and loud whining sound that come and goes, all the while I was keeping the speed and rpm steady at about 110km/h and 3000rpm... did not feel any difference to engine performance, can still accelerate and decelerate normally, no warning lights. The sound is a bit like a jet engine, also a bit like a supercharger whine (last I checked there wasn't any supercharger under the hood :) ). Sounded like from the front. It came and went away, a few times over a few minutes, very similar to the performance/rhythm of the fan clutch as the coolant temperature rise and fall, maybe more like the coolant flow stopping and starting as regulated by the thermostat. And after coming and going for a few times, it went away completely, but by then the traffic had slowed to about 90km/h. Then the traffic went into a stop-start jam because of roadworks, none of the sound came back, all the way through Juru toll, Penang bridge and into George Town, till today. All the while there was no difference in coolant temperature reading either, rock steady in the middle as usual. So, what gives? Anyone experienced this before? Is it a sign of the viscous coupling fan clutch about to go up to the big fan clutch in the sky? Or is it something more serious like my Vanos going kaboom? Or maybe some dead rat getting shredded? Or any chance that the ballz of the car (rear diff lah) about to be fried soon (although I still think that the sound came from front)? Anyway, upon reaching home, I opened up the bonnet to check, with car engine idling, no funny stains visible, no funny sounds either. An no dead rat too. The fan still has the characteristic whoosh sound when revved above 2000rpm. [/QUOTE]
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E36 325i jet engine whining sound, intermittent
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